I. A. Charushnikova

• Russian Academy of Sciences

Five new mixed-valence NpV/AnVI molybdates of the composition [C(NH2)3]3[(NpVO2)(NpVIO2)(MoO4)3(H2O)]·H2O (1), [C(NH2)3]3[(NpVO2)(NpVIO2)(MoO4)3(H2O)]·3H2O (2), Na3[(NpVO2)(PuVIO2)(MoO4)3(H2O)]·nH2O (3), Na6[(NpVO2)2(UVIO2)(MoO4)5]·13H2O (4), and LiNa2[(NpVO2)(NpVIO2)2(MoO4)4(H2O)]·4H2O (5) have been synthesized and structurally characterized. The...

Two new Np(V) azide complexes with electroneutral N-donor ligands of terpyridine derivatives have been synthesized and structurally characterized: [(NpO 2 )(Cl-Terpy)(N 3 )(H 2 O)] ( 1 ) and a centrosymmetric dimer [(NpO 2 )(EtO-Terpy)(N 3 )] 2 ·2CH 3 OH ( 2 ). The coordination polyhedra of Np atoms in compounds are pentagonal bipyramids with “yl”...

Синтезированы и структурно охарактеризованы фумараты An(VI): дигидраты общего состава [AnO 2 (C 4 H 2 O 4 )(H 2 O) 2 ] (An = U, Np, Pu) и моногидрат [UO 2 (C 4 H 2 O 4 )H 2 O]. Дигидраты имеют цепочечное строение, координационный полиэдр (КП) атомов An(VI) -искаженная гексагональная бипирамида. Фумарат-ионы связаны с двумя катионами AnO 2 2+ с обра...

Three new complexes of Np(V) dicyanamide with electroneutral N-donor ligands have been synthesized and structurally characterized: two with terpyridine derivatives: [(NpO 2 )(Cl-Terpy)(DMA)(N(CN) 2 )]·0.5DMA ( 1 ), [(NpO 2 )(TPTZ)(N(CN) 2 )(H 2 O)]·2H 2 O·CH 3 OH ( 2 ) and a dimeric complex with bipyridine [(NpO 2 )(Bipy)(N(CN) 2 )(H 2 O)] 2 ·2(CH...

New complexes of neptunyl(V) isothiocyanate with 4'-aryl-substituted 2,2':6',2″-terpyridines (Terpy) and N,N-dimethylacetamide (DMA) were obtained: [(NpO2)(4'-Ph-Terpy)(DMA)(NCS)]·DMA, [(NpO2)(4'-(4-(CF3)C6H4)-Terpy)(DMA)(NCS)]·2H2O·DMA, [(NpO2)(4'-(3-BrC6H4)-Terpy)(DMA)(NCS)]·DMA, and [(NpO2)(4'-(2-(COOH)C6H4)-Terpy)(DMA)(NCS)]·DMA. The structures...

The hydrothermal method was used to obtain two new compounds of Np(V): benzoate [(NpO2)3(py) (C7H5O2)3(H2O)2] (1) and salicylate [(NpO2)(phen)(HOC7H4O2)] (2), where py = pyridine and phen = 1,10-phenanthroline. An X-ray diffraction analysis of these compounds demonstrated that NpO+2 cations are bound together by cation-cation bonds to form distorte...

Behavior of UVI, NpVI and PuVI in water‐acetonitrile solutions was studied spectrophotometrically with the successive addition of the polar organic ligands (dimethyl sulfoxide or hexamethylphosphoric triamide) and the NCS– ion. The detected spectral effects – changes in the absorption intensity, bathochromic shifts in the absorption bands, the abse...

The Np(V) complex Na[NpO2(cbc)2] was isolated in the crystalline form and studied by single crystal X-ray diffraction. The coordination surrounding of the Np(1) atom is a pentagonal bipyramid with the O atoms of the NpO2 group in apical positions. The equatorial plane of the bipyramid is constituted by one O atom of the adjacent NpO2 group and four...

Three new Np(VI) complexes with cyclobutanecarboxylic acid anions and single-charged outer-sphere anions: ammonium, [NH4][NpO2(cbc)3] (I), guanidinium, [C(NH2)3][NpO2(cbc)3] (II), and tetramethyl-ammonium, [N(CH3)4][NpO2(cbc)3] (III), were synthesized and studied by single-crystal X-ray diffraction. The coordination surrounding of the Np atoms in I...

The structures of three new Np(V) complexes [(NpO2)2(phen)2(C7H5O2)2] (I), [(NpO2)2(phen)2. (o-C7H4FO2)2] (II), and [(NpO2)2(phen)2(p-C7H4FO2)2] (III), where phen = 1,10-phenanthroline, were studied. Two NpO2⁺ cations in the complexes are bound to each other by cation-cation bonds in which both neptunyl(V) ions act with respect to each other as lig...

Actinide(VI) complexes with succinate anions [PuO2(succ)(H2O)] and Cs2[(AnO2)2(succ)3]·H2O (An = U, Np, Pu), where succ = [C4H4O4]2 −, were synthesized and studied by single crystal X-ray diffraction. The compound [PuO2(succ)(H2O)] is isostructural with [UO2(succ)(H2O)] [1] and forms a three-dimensional electrically neutral framework in the crystal...

The previously unknown Np(VII) compound Li[C(NH2)3]2[NpO4(OH)2]·6H2O (I), containing organic cations, was synthesized and studied by single crystal X-ray diffraction. In contrast to the relatively numerous structurally characterized salts of [NpO4(OH)2]3– anions with Na+, K+, Rb+, and Cs+ cations, which were prepared only from strongly alkaline med...

New complexes of hexavalent actinides with cyclobutanecarboxylic acid (Hcbc) anions, Na4[NpO2· (cbc)3]4·H2O (I), K[NpO2(cbc)3] (II), Cs[NpO2(cbc)3] (III), and Cs[PuO2(cbc)3] (IV), cbc = C4H7(COO)–, were synthesized and studied by single crystal X-ray diffraction. The structures of I–IV are based on the anionic complexes [AnO2(cbc)3]– surrounded by...

Mixed-cation salts of the composition NaM2[PuO4(OH)2]·4H2O, where M = Rb (I) and Cs (III), and NaRb5[PuO4(OH)2]2·6H2O (II) were synthesized and structurally characterized. The central Pu atom in [PuO4(OH)2]3– anions has oxygen surrounding in the form of a tetragonal bipyramid with oxygen atoms of hydroxide ions in apical positions. The hydrated Na⁺...

Mixed-cation salts of the general composition NaM2[NpO4(OH)2]·4H2O, where M = Rb (I, II) and Cs (III), were synthesized and structurally characterized. The compounds differ from each other in the structural organization. The Np central atom in [NpO4(OH)2]3– anions has oxygen surrounding in the form of a tetragonal bipyramid with the O atoms of hydr...

The complexation of U(VI) and Pu(VI) with succinic acid in aqueous acid solutions is investigeted and compared. The affinity capillary electrophoresis (ACE) has been used to study the interaction of U(VI) with succinic acid in perchloric acid aqueous solutions (p[H] 2.0-2.5, 0.1 M ionic strength). The speciation model for uranyl is deduced in the p...

Two procedures for preparing the compounds M(NpO4)2·nH2O (M = Mg, Ca, Sr, Ba) using boric acid were suggested. In the first procedure, samples of freshly prepared salts M3(NpO5)2·nH2O (M = Ca, Sr, Ba) are treated with excess 0.5 M H3BO3 with vigorous stirring. In the process, the initially light green salts rapidly transform into black products of...

The reaction of the ozone–oxygen mixture with aqueous suspensions of Np(IV) and Pu(IV) oxalates was studied. Both metal cations and oxalate anions are oxidized in the process. The final products are Np(VI) and Pu(VI) hydroxides. The composition of Np(VI) hydroxide was confirmed by X-ray diffraction analysis. Oxidation of Np(IV) oxalate with oxygen...

New complexes of hexavalent U, Np, and Pu of the composition [UO2(bipy)(cbc)2] (I) and [AnO2(bipy)(cbc)2]·0.5(bipy) [An = Np (II) and Pu (III)] with cyclobutanecarboxylic acid anions C4H7COO– and 2,2′-bipyridine (bipy) were synthesized, and their structures were studied. The An atoms in I–III have the coordination surrounding in the form of distort...

New complexes of hexavalent actinides with cyclobutanecarboxylic acid (Hcbc) anions, dihydrates [AnO2(cbc)2(H2O)2] [An = U (I) or Np (II)] and monohydrates [AnO2(cbc)2(H2O)] [An = Np (III) or Pu (IV)], were synthesized and studied by single crystal X-ray diffraction. The crystal structure of dihydrates I and II consists of discrete complexes. The c...

A Np(VII) compound with [Co(en)3]³⁺ cations, [Co(en)3][NpO4(OH)2]·5H2O (en = ethylenediamine), was synthesized and studied by single crystal X-ray diffraction. The structure consists of [NpO4(OH)2]3– anions and [Co(en)3]³⁺ cations forming electrically neutral layers, between which water molecules are arranged. A three-dimensional network of hydroge...

The structure and properties of the needle-like phase of crystalline compounds of the general composition Co(NH3)6NpO5·nH2O, precipitated from alkaline Np(VII) solutions with [Co(NH3)6]³⁺ ions, were studied. The needle-like phase under the layer of the mother liquor is unstable and transforms into a platelike phase identified as [Co(NH3)6][NpO4(OH)...

Tricarbonate complexes of hexavalent U, Np, and Pu with outer-sphere cesium cations, Cs4AnO2·(CO3)3·6H2O, were synthesized and studied by single crystal X-ray diffraction analysis. Crystals of Cs4AnO2·(CO3)3·6H2O consist of [AnO2(CO3)3]4– complex anions and hydrated Cs⁺ cations. The coordination polyhedron (CP) of An(VI) atoms is a distorted hexago...

A series of isostructural compounds of the composition Na7H[EMo12O42]·12H2O, where E(IV) = Ce, Th, U, Np, or Pu, were synthesized and structurally characterized. In the [EMo12O42]8– heteropolyanion (HPA), the central E(IV) atom is surrounded by six Mo2O9 groups, each constituted by two octahedra sharing a common face. The coordination polyhedron (C...

The compounds [Th(NpO2)6(H2O)8(OH)Cl9]·H2O (I) and [Th(NpO2)6(H2O)9Cl9]Cl (II), in which mixed-element Th(IV)/Np(V) cation–cation interaction is observed, were isolated in the form of single crystals and studied by X-ray diffraction. The NpO2⁺···NpO2⁺ cation–cation bonds link the dioxocations into six-unit rings, and the NpO2⁺···Th⁴⁺ bonds link the...

New An(VI) isophthalate complexes [PuO2(C8H4O4)] (I), Cs2[(NpO2)2(C8H4O4)3]·4H2O (II), [H3O]2[(NpO2)2(C8H4O4)3]·nH2O (III), and [H3O][NpO2(C8H4O4)(C8H5O4)]·2H2O (IV) with the An(VI): Lig ratios of 1: 1 (I), 1: 1.5 (II, III), and 1: 2 (IV) were synthesized and studied by single crystal X-ray diffraction. In complex I, the coordination polyhedron of...

The structure and spectral properties of the Np(V) nitrite and thiocyanate complexes Cs3[NpO2· (NO2)4] and Cs4[NpO2(NCS)5]·2.5H2O were studied. In the structure of Cs3[NpO2(NO2)4], two independent Np atoms occupy special positions and have similar oxygen surrounding in the form of hexagonal bipyramids. The equatorial planes of the bipyramids are fo...

Two previously unknown isophthalate complexes [AnO2(C8H5O4)2(H2O)]2 [An(VI) = U, Np] were synthesized, and their structure was studied by single crystal X-ray diffraction. The compounds are isostructural. Their structural unit is a centrosymmetrical dimeric complex. The coordination surrounding of the An(VI) atoms in the structure is formed by the...

Previously unknown Np(VII) compounds with alkaline earth metal cations of the composition M[NpO4OH]·nH2O (M = Ca, Sr, Ba) were prepared in the crystalline form and studied by single crystal X-ray diffraction analysis. The main structural motif in the compounds is formed by infinite anionic chains [NpO4· (OH)] n 2n– in which the NpO4 groups are link...

A new double Th(IV)/Np(V) nitrate, [H3O][Th2(NpO2)3(H2O)9(NO3)12]·2H2O, was isolated in the crystalline form and studied by single crystal X-ray diffraction. Two independent Np atoms in the structure have the coordination polyhedra (CPs) in the form of pentagonal bipyramids with “yl” O atoms in the apical vertices. The equatorial plane of the Np(1)...

New Np(V) isophthalate complexes of the compositions [(NpO2)2(C6H4(COO)2)(H2O)]·H2O (I) and M[(NpO2)(C6H4(COO)2)]·nH2O, where M = [H3O] (IIa), [NH4] (IIb), and [C(NH2)3] (IIc), were synthesized and studied by single crystal X-ray diffraction. Cation-cation interaction was revealed in their structure. In the structure of I, each of three nonequivale...

The structure and spectra of the Np(V) terephthalate [C(NH2)3]3[NpO2(C6H4(COO)2)2]·5H2O (I) and An(VI) terephthalates [AnO2(C6H4(COO)2)] (II), where An = U, Np, or Pu, were studied. The crystal structure of I is build of NpO2+ cations and terephthalate anions linked with each other in infinite anionic chains [NpO2(C6H4(COO)2)2]n3−, with the water m...

Actinide(IV) tribromoacetates of the composition [An(CBr3COO)4(H2O)2]2 (An = Th, U, Np) were synthesized and studied. Their structural feature is the formation of electrically neutral dimeric complexes. The surrounding of the An(IV) atoms in the dimers is formed by the oxygen atoms of six CBr3COO− anions and two water molecules; the coordination nu...

The structures of Ln(III) and Am(III) complexes with anions of 1,10-phenanthroline-2,9-dicarboxylic acid (H2PDA) of the compositions [Pr(PDA)(NO3)(H2O)3]·H2O (I), [Ln(PDA)(NO3)(H2O)2]·H2O [where Ln = Nd (IIa), Sm (IIb), Gd (IIc)], [Am(PDA)(NO3)(H2O)2]·H2O (III), and [Nd(PDA)(NO3)· (H2O)] (IV), containing in the coordination sphere of the metal atom...

The structure of new mixed-valent An(IV)/Np(V) compounds [An(NpO2)(H2O)3(CBr3COO)5]·CBr3COOH·nH2O, where An(IV) = Th and Np, was studied. Two independent Np(V) atoms have the coordination surrounding in the form of pentagonal bipyramids with the O atoms of NpO 2+ dioxocations in apical positions; the equatorial planes of the bipyramids are constitu...

Attempts were made to isolate anhydrous compounds of [NpO4(OH)2]3− anions with heavy alkali metal cations (K, Rb, Cs) by crystallization at elevated temperatures, and the salt K3[NpO4(OH)2] was isolated and studied. Crystals of K3[NpO4(OH)2] consist of tetragonal bipyramidal [NpO4(OH)2]3− anions and K+ cations. The [NpO4(OH)2]3− anion occupies the...

Double Ln(III) malonates of two different compositions crystallize from malonate solutions containing [Co(NH3)6]3+ ions. Lanthanides of the beginning of the series form compounds of the composition [Co(NH3)6][Ln(mal)2]3·6H2O (I) (Ln = La, Ce, Pr, Nd; mal = C3H2O2−), and those of the end of the series form compounds of the composition [Co(NH3)6]2[Ln...

Complexes of Np(V) with 1,10-phenanthroline-2,9-dicarboxylic acid, C12H6N2(COOH)2 (H2PDA), of the compositions [(NpO2)2(PDA)(H2O)3]·H2O (I), (NH4)2[NpO2(PDA)]2·3H2O (II), and [C(NH2)3]2[NpO2·(PDA)]2·4H2O (III) were synthesized. The Np atoms in the crystal lattices of all the compounds have the pentagonal bipyramidal coordination surrounding, with t...

A new mixed-valent Np(IV)/Np(V) chloride, [Np(NpO2)6(H2O)8(OH)Cl9]·H2O, was synthesized, and its crystal structure was determined. The crystals consist of NpO 2+ and Np4+ cations, of Cl− and OH− anions, of coordination-bonded water molecules, and of water molecules of crystallization. The Np(V) atom, Np(1), has pentagonal bipyramidal coordination s...

Single crystals of [Th(TMP)6(NO3)2][Th(TMP)2(NO3)5]2 (1), [Th(TMP)4(NO3)3][Th(TMP)2(NO3)5] (2), [U(DMP)3(NO3)] (3), [Np(DMP)3(NO3)] (4), and [Pu(DMP)2(NO3)2(H2O)]·H2O (5) have been synthesized and their structures have been determined by X-ray analysis. IR and optical spectra of polycrystalline compounds 3 and 4 were measured at room temperature. T...

Although transition metal cyano bimetallic compounds have been well known for decades for their interesting optical and magnetic properties, reports on actinide hexacyanoferrate compounds are scarce. For instance, a thorough structural description is still lacking. Another question is the possible covalency or charge transfer effects in these mater...

Precipitation of salts M3[NpO4(OH)2]·nH2O (M = Na, K, Rb, Cs) from concentrated alkali solutions at low temperatures (about −10°C) was studied. From solutions with [OH−] > 9.5 M, these compounds are isolated as coarse black crystals in high yield without impurity of other phases. The K, Rb, and Cs salts crystallize in the form of the previously stu...

A new Am(V) chromate complex with outer-sphere cesium cation, Cs3AmO2(Cr2O7)2·H2O, was prepared from aqueous solution. Its composition and structure were determined by single crystal X-ray diffraction. The Am(V) atom has coordination surrounding in the form of a distorted pentagonal bipyramid with the O atoms of the AmO 2+ group in apical positions...

Actinide(VII) salts Rb3[NpO4(OH)2]·3H2O (I) and Rb3[PuO4(OH)2]·3H2O (II) were prepared as single crystals and examined by X-ray diffraction. The compounds are isostructural and crystallize in the monoclinic system, space group C2/c, Z = 4; unit cell parameters: a = 12.1544(3), b = 10.9942(2), c = 7.789(2) Å, β = 91.0930(11)° for I and a = 12.1254(3...

Single crystals of [Th(TMP)(4)(DMP)(2)](2)[ClO4](4) and [UO2(TMP)(DMP)(NO3)](2) have been synthesized and their structures have been determined by X-ray diffraction analysis. The complexes of Th(IV) and U(VI) contain simultaneously both the molecular ligand trimethyl phosphate (TMP) and the anion dimethyl phosphate. The main structural motif in Th(...

A new Pu(VII) compound, Na3[PuO4(OH)2]·2H2O, was prepared by X-ray diffraction analysis, and its structure was studied. To reveal the character of actinide contraction in going from Np(VII) to Pu(VII), the geometric parameters of the tetragonal-bipyramidal surrounding of Pu(VII) in the [PuO4(OH)2]3− anion were compared with those of Np(VII) in the...

A formation of Am(VI) carbonate complexes has been observed under ozonation of Am(III) in guanidinium carbonate solutions. New [C(NH2) 3]4[AmO2(CO3)3] ·2H2O tricarbonate complex has been isolated and studied by the X-ray analysis. The Am atom has oxygen environment as distorted hexagonal bipyramid with three CO32- ions in equatorial plane and oxyge...

Single crystals of [AnO(2)(bipy)(OOCC6H4NO2)-(H2O)]center dot 0.5bipy (An = Np, Pu, bipy = 2,2'-bipyridine) have been synthesized and their structures have been determined by X-ray analysis. The compounds are isomorphous and contain electroneutral complexes [AnO(2)(biPY)(OOCC6H4NO2)(H2O)] and solvate bipy molecules. Actinide atoms in both compounds...

The reaction between Ph(3)PO dissolved in acetone and "PuO(2)Cl(2)" in dilute HCl resulted in the formation of [PuO(2)Cl(2)(Ph(3)PO)(2)]. Crystallographic characterization of the acetone solvate revealed the expected axial trans plutonyl dioxo, with trans Cl and Ph(3)PO in the equatorial plane. Spectroscopic analyses ((31)P NMR, (1)H NMR, and vis/n...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Neptunium(VI) benzoate with mu(3)-OH(-) has been isolated and studied by the X-ray method. The main structural motive in the crystal is corrugated ribbons [(NpO(2))(2)(mu(3)-OH)(2)(C(7)H(5)O(2))(2)](n) extended along the c axes in which three neptunium pentagonal bipyramids are linked through the mu(3)-OH(-) ligand. The benzoate ions are arranged a...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

The structure of new double benzoates of hexavalent actinides, K11(AnO2)23(O2C7H5)57(H2O)18+x (An = U, Np), was studied. There are five crystallographically independent actinide atoms in the crystals. The coordination polyhedra of An(1), An(3), An(4), and An(5) are distorted hexagonal bipyramids, and that of An(2) is a distorted pentagonal bipyrami...

A new mixed valent neptunium compound [BuMeIm](5)[Np(NpO(2))(3)(H(2)O)(6)Cl(12)] was synthesized by evaporation of an ethyl acetate-acetone mixture where the salt [BuMeIm](2)[NpCl(6)] was dissolved. The crystal structure was determined using single crystal X-ray diffraction; it consists of four crystallographically unique Np centers with two differ...

Complexes of pentaand hexavalent actinides with phosphoryl-containing podands incorporating a triethylene glycol fragment and 2-(diphenylphosphinyl)phenyl (L1) or 2-(diphenylphosphinylmethyl)phenyl (L) end groups were synthesized and structurally characterized. The complexes can be described by the following formulas: [NpO2L(C2H5OH)(NO3)] (I) for p...

The crystal structure of new complexes of Np(V) and Pu(V) propionates with 2,2’-bipyridine (Bipy) was studied. The compounds are isostructural. Their crystals are built of electrically neutral complexes [AnO2 (C10H8N2)(OOCC2H5)(H2O)] (An = Np, Pu). The equatorial surrounding of the actinyl(V) group consists of two nitrogen atoms of Bipy, two oxygen...

Single crystals were prepared, and the structures of two complexes of Np(V) glycolate with 2,2'-bipyridine of the compositions [NpO2(C 10H8N2)(OOC2H2OH)l-1. 5H2O (I) and [NpO2(C10H8N 2)(OOC2H2OH)]-2.5H2O (II) were studied. The structures of the compounds are based on neptunyl-glycolate chains in which the glycolate anion manifests its complexation...

The coordination complexes of trivalent f-element pertechnetates and perrhenates with some N-donor ligands were determined by using X-ray structural analysis: Nd3+ perrhenate with 2,6-bis(tetramethylfurano)-1,2,4-triazin-3-yl)-pyridine ([Nd(FBTP)3ReO4](ReO4)2·2H2O (I)), tris(2-pyridylmethyl)amine ([Nd(TPA)(ReO4)3] (II)) and N,N′-tetraethylmalonamid...

Prolonged heating of the malonate UO2(OOC)2CH2·3H2O at 165°C under a layer of concentrated acetic acid yields the acetate [UO2(OOCCH3)2·HOOCCH3]2 (I). In electrically neutral dimer I, the U atom (coordination number 7) is surrounded by chelating acetate ion [average U-O bond length 2.452(3) Å], an HOOCCH3 molecule [U-O bond length 2.391(3) Å], and...

KNpO2(OOCH)2 was isolated from neutral Np(V) solutions with a high concentration of potassium formate. The crystal structure of this compound was determined. The structure consists of infinite anionic chains [NpO2(OOCH)2] n n−. Potassium cations are located between these chains. The Np coordination polyhedron is a hexagonal bipyramid whose equator...

For studying actinide contraction in triacetate and tricarbonate complexes of hexavalent actinides in the series U-Np-Pu, single crystals were prepared and crystal structures of NaPuO2(OOCCH3)3 and (NH4)4. AnO2(CO3)3 (An = Np, Pu) were determined. These compounds are isostructural with NaAnO2(OOCCH3)3 (An = U, Np) and (NH4)4UO2(CO3)3 studied previo...

Single crystals of [PuO2(NO3)2(TPPO)2] (TPPO = OPPh3) isostructural to the related compounds of uranyl and neptunyl were isolated, and the structure of this complex was determined. Contrary to the complexes [AnO2(TPPO)4](ClO4)2 studied previously, the interatomic distances and volumes of coordination polyhedra of An in these compounds somewhat decr...

Single crystals of [NpO2(TPPO)4](ClO4)2 and [PuO2(TPPO)4](ClO4)2 isostructural to the complex [UO2(TPPO)4](ClO4)2 [TPPO = OP(C6H5)3] studied previously were prepared, and the structures of these compounds were determined. The coordination polyhedron of these compounds is a tetragonal bipyramid. The geometric characteristics of the tetragonal bipyra...

The crystal structure of isostructural Pu(V) and Np(V) acetates of the general composition SrAnO2Ac3 · 3H2O (Ac = CH3COO−) was determined. The structures are based on complex anions [AnO2Ac3]2− and Sr2+ cations combined into a three-dimensional framework with water molecules located in framework cavities. The An(V) atoms are characterized by the he...

Double Pu(V) and Np(V) acetates of the compositions BaPuO2Ac3·2H2O and SrAnO2Ac3·3H2O with An = Pu and Np were synthesized in a well-crystallized form. In the dry state the compounds are stable in prolonged storage and are not hygroscopic. The plutonyl(V) and neptunyl(V) salts of the similar composition are isostructural. The IR spectra of the comp...

A new Pu(VII) compound, K3PuO4(OH)2·2H2O, was synthesized, and its structure was studied by single crystal X-ray diffraction. This compound is isostructural to the previously described K3NpO4(OH)2·2H2O. The structure of the latter compound was redetermined to obtain more precise interatomic distances in the NpO2(OH) 23− anion. Changes in An-O bond...

Double salts of o-phthalic acid of the general composition M2AnO2(C8H4O4)2nH2O (M = NH4, K, Cs and An = Pu, Np) were isolated from neutral aqueous solutions. The composition was determined by chemical analysis. The compounds were characterized by powder X-ray diffraction, and unit cell parameters of some salts were determined from the powder X-ray...

Neptunium(V) at its relatively high concentrations in oxalate solutions forms, along with the mono-and bioxalate complexes, the intermediate binuclear anion (NpO2)2(C2O4) 3 4− . This anion gradually crystallizes from cold aqueous-ethanol solutions in the form of the compound Na4(NpO2)2(C2O4)3 6H2O, and from hot aqueous-ethanol solutions, in the for...

The crystal structure of a previously unknown Np(V) sesquioxalate, Na4(NpO2)2(C2O4)3·2H2O was studied. The crystal structure consists of neptunyl(V) cations, sodium cations, oxalate anions, and water molecules of crystallization. Neptunyl(V) cations and oxalate ions form anionic chains [(NpO2)2(C2O4)3] n 4n−. The coordination polyhedron (CP) of Np...

Double phthalates of Np(VI) and Pu(VI) of the composition Na4[AnO2L3] · nH2O [L = (OOC)2C6H4] were synthesized in the crystalline form and studied by X-ray diffraction. The compounds are isostructural, their crystals consist of complex anions [AnO2L3]4− and Na+ cations, forming neutral layers; water molecules are located between the layers. The coo...

A new basic Nd3+ nitrate, [Nd6O(OH)8(H2O)14(NO3)6](NO3)2 · 2H2O (I), is isolated in the crystal form and studied. Compound I differs from the basic Ln nitrates containing [Ln 6O(OH)8] clusters in that it involves a larger number of water molecules. The incorporation of additional water molecules is accompanied by changes in the coordination environ...

Single crystals of the Np(V) and Pu(V) benzoate complexes with 2, 2′-bipyridine were prepared. According to X-ray diffraction analysis data, they are isostructural neutral dimers with the [AnO2(C 10H8N2)(OOCC6H5)] 2 (An = Np or Pu) composition. In crystals of these compounds the AnO2+ are linked to each other in pairs, acting simultaneously as liga...

The crystal structures of two uranyl nitrate complexes with 2,2′-6,2″-terpyridine (Trpy), [(UO (Trpy)-[(UO2)2(Trpy)2(OH)2][UO2(NO3)2(OH)2] 2CH3OH (I) and [(UO2)2(Trpy)2(OH)2]2[UO2(NO3)3(H2O)](NO3)3 3H2O (II), were studied. Compound I consists of the centrosymmetric dimeric cations [(UO2)2(Trpy)2(OH)2]2+, the anions [UO2(NO3)2(OH)2]2−, and solvation...

Uranyl complexes with acetylenedicarboxylic acid, K(H5O2)[UO2L2H2O] · 2H2O (I) and Cs2[UO2L2H2O] · 2H2O (II), L2− = C4O 42− were prepared for the first time. The composition and structure of the complexes were determined by X-ray diffraction. The crystal data are as follows: a = 16.254(12) Å, b = 13.508(8) Å, c = 7.683(6) Å, β = 90.91(7)°, space gr...

The crystal structure of new complexes of praseodymium(III) and ytterbium(III) (elements from the initial and final parts of the lanthanide series), namely, [Pr(NO3)3 (Terpy)((CH3)2CO)] (I) and [Yb(NO3)2(Terpy)(H2O)2]NO3 2H2O (II), is investigated. The structure of compound I consists of [Pr(NO3)3(Terpy)((CH3)2CO)] neutral complexes. The coordinati...

Crystal structure of Np[S2CN(C2H5)2]4 has been determined. The environment of the Np atom is formed by eight sulfur atoms. The coordination polyhedron of the Np atom is a dodecahedron. The Np-S bond lengths vary from 2.782(2) to 2.812(2) Å (average 2.795 Å). Two independent (H5C2)2NCS 2− anions are characterized by different orientations of the die...

Actinide elements and their chemistry have a significant number of applications. Bringing together contributions from the leading experts in the field, Recent Advances in Actinide Science covers six main topics: * Analysis, the environment and biotransformations * Coordination and organometallic chemistry * Heavy elements * Nuclear fuels, materials...

Actinide elements and their chemistry have a significant number of applications. Bringing together contributions from the leading experts in the field, Recent Advances in Actinide Science covers six main topics: * Analysis, the environment and biotransformations * Coordination and organometallic chemistry * Heavy elements * Nuclear fuels, materials...

Actinide elements and their chemistry have a significant number of applications. Bringing together contributions from the leading experts in the field, Recent Advances in Actinide Science covers six main topics: * Analysis, the environment and biotransformations * Coordination and organometallic chemistry * Heavy elements * Nuclear fuels, materials...

Actinide elements and their chemistry have a significant number of applications. Bringing together contributions from the leading experts in the field, Recent Advances in Actinide Science covers six main topics: * Analysis, the environment and biotransformations * Coordination and organometallic chemistry * Heavy elements * Nuclear fuels, materials...

Actinide elements and their chemistry have a significant number of applications. Bringing together contributions from the leading experts in the field, Recent Advances in Actinide Science covers six main topics: * Analysis, the environment and biotransformations * Coordination and organometallic chemistry * Heavy elements * Nuclear fuels, materials...

Actinide elements and their chemistry have a significant number of applications. Bringing together contributions from the leading experts in the field, Recent Advances in Actinide Science covers six main topics: * Analysis, the environment and biotransformations * Coordination and organometallic chemistry * Heavy elements * Nuclear fuels, materials...

An X-ray diffraction study of CsNpO2C2O4 · nH2O was carried out. The structure consists of NpO 2+ and Cs+ cations, oxalate anions, and water molecules. Dioxo cations are combined by cation-cation interaction into cyclic trimer in which each NpO 2+ cation act as monodentate ligand. The coordination polyhedron of the Np(V) atom is a pentagonal bipyra...

Single crystals of (NpO2)2SO4 · 6H2O are obtained, and their structure is determined. The structure is built of NpO 2+ dioxo cations, SO 42− anions, and molecules of coordination and crystallization water. The NpO 2+ ions are linked into cationic ribbons stretched along the [001] direction. In the ribbons, neptunoyl ions of one type act as monodent...

A new oxalate complex, Na4(NpO2)2(C2O4)3·6H2O, with the Np:C2O4 ratio of 2:3 was synthesized and studied by single crystal X-ray diffraction. In the crystal, the NpO 2+ cations and oxalate anions are bound in open networks [(NpO2)2(C2O4)3] n4n- parallel to the bc plane. The Na(1) cations are accommodated in large voids of the neptunyl oxalate netwo...

The Pr atom in the title complex, [Pr(NO3)3(C15H11N3)(H2O)]·C3H6O, is ten-coordinated and the arrangement can be described as a distorted bicapped square anti­prism.

The Pr atom in the title complex, [Pr(NO3)3(C15H11N3)(H2O)]·C3H6O, is ten-coordinated and the arrangement can be described as a distorted bicapped square anti­prism.

The crystal structure of a dioxalate complex Co(NH3)6NpO2(C2O4)2·1.5H2O was studied. The structure consists of centrosymmetrical dimeric anions [NpO2(C2O4)2] 26−, [Co(NH3)6]3+ cations, and water molecules of crystallization. The NpO 2+ dioxocations have close Np-O bond lengths (average 1.824 Å) and are noticeably bent (ONpO angle 175.6°). Each diox...