Ebbe Nordlander

Lund University, Lund, Skåne, Sweden

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Publications (150)448.53 Total impact

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    ABSTRACT: The reactivity of the σ,π–thienyl complex [Fe2(CO)6(μ-Th)(μ-PTh2)] (1) towards a range of phosphines has been studied. With PR3 (R = Ph, Th) carbonyl substitution affords [Fe2(CO)5(PR3)(μ-Th)(μ-PTh2)] (2a–b) as the major product, with smaller amounts of the thienyl–acyl complexes [Fe2(CO)5(PR3)(μ-OC-Th)(μ-PTh2)] (3a–b) resulting from a migratory carbonyl insertion into the thienyl ligand. With diphosphines, thienyl–acyl complexes are the major products in all cases. With dppm, [Fe2(CO)4(μ-dppm)(μ-OC-Th)(μ-PTh2)] (4) results in which the diphosphine bridges the iron–iron bond, while with other diphosphines the chelate complexes [Fe2(CO)4(κ2-diphosphine)(μ-OC-Th)(μ-PTh2)] (5–9) are isolated, as established through crystallographic studies on [Fe2(CO)4(κ2-dppe)(μ-OC-Th)(μ-PTh2)] (5) and [Fe2(CO)4(κ2-dppb)(μ-OC-Th)(μ-PTh2)] (9), both of which show that the diphosphine binds selectively to the oxygen-bound metal centre with phosphorus atoms lying trans to the metal–metal bond and μ-PTh2 bridge. With 1,2-bis(diphenylphosphino)benzene (dppb), [Fe2(CO)5{μ,κ2-C6H4PPh(C6H4)PPh2}(μ-PTh2)] (10) is isolated in low yields and results from cyclometalation of a phenyl ring and putative elimination of thiophene. In a separate experiment, it has been shown that heating 9 results in the slow formation of 10.
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    ABSTRACT: The mol-ecule of the title compound, C14H13N5O2, is approximately planar (r.m.s deviation for all non-H atoms = 0.093 Å), with the planes of the two pyridine rings inclined to one another by 5.51 (7)°. The oxime group is syn to the amide group, probably due to the formation of an intra-molecular N-H⋯N hydrogen bond that forms an S(6) ring motif. In the crystal, mol-ecules are linked by pairs of bifurcated O-H⋯(O,N) hydrogen bonds, forming inversion dimers. The latter are linked via C-H⋯O and C-H⋯N hydrogen bonds, forming sheets lying parallel to (502). The sheets are linked via π-π stacking inter-actions [inter-centroid distance = 3.7588 (9) Å], involving the pyridine rings of inversion-related mol-ecules, forming a three-dimensional structure.
    Acta Crystallographica Section E Structure Reports Online 12/2014; 70(Pt 12):584-6. DOI:10.1107/S1600536814025793
  • Debbie C. Crans, Ebbe Nordlander
    Berichte der deutschen chemischen Gesellschaft 09/2014; 2014(27). DOI:10.1002/ejic.201402826
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    ABSTRACT: The oxidation of sulfite to sulfate by two different models of the active site of sulfite oxidase has been studied. Both protonated and deprotonated substrates were tested. Geometries were optimized with density functional theory (TPSS/def2-SV(P)) and energies were calculated either with hybrid functionals and large basis sets (B3LYP/def2-TZVPD) including corrections for dispersion, solvation, and entropy, or with coupled-cluster theory (LCCSD(T0)) extrapolated toward a complete basis set. Three suggested reaction mechanisms have been compared and the results show that the lowest barriers are obtained for a mechanism where the substrate attacks a Mo-bound oxo ligand, directly forming a Mo-bound sulfate complex, which then dissociates into the products. Such a mechanism is more favorable than mechanisms involving a Mo-sulfite complex with the substrate coordinating either by the S or O atom. The activation energy is dominated by the Coulomb repulsion between the Mo complex and the substrate, which both have a negative charge of -1 or -2.
    JBIC Journal of Biological Inorganic Chemistry 06/2014; 19(7). DOI:10.1007/s00775-014-1172-z
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    ABSTRACT: Enantioselective hydrogenation of tiglic acid effected by diastereomers of the general formula [(μ-H)2Ru3(μ3-S)(CO)7(μ-P-P*)] (P-P* = chiral Walphos diphosphine ligand) strongly supports catalysis by intact Ru3 clusters. A catalytic mechanism involving Ru3 clusters has been established by DFT calculations.
    Chemical Communications 06/2014; 50(57). DOI:10.1039/c4cc02319f
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    ABSTRACT: The new clusters [Ru3(CO)9(μ-dppf){P(C4H3E)3}] (E = O, S) rearrange upon heating to give cyclometalated clusters [(μ-H)Ru3(CO)7(μ-dppf){μ3-(C4H3E)2P(C4H2E)}], behavior that is in marked contrast to the analogous dppm complexes in which both carbon-hydrogen and carbon-phosphorus bond activation yields furyne- and thiophyne-capped clusters. This difference in reactivity is probed by DFT calculations.
    Journal of Organometallic Chemistry 06/2014; 760:231–239. DOI:10.1016/j.jorganchem.2013.09.021
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    ABSTRACT: The heterodinuclear mixed-valence complex [FeMn(ICIMP)(OAc)2Cl] (1) {H2ICIMP = 2-(N-carboxylmethyl)-[N-(N-methylimidazolyl-2-methyl)aminomethyl]-[6-(N-isopropylmethyl)-[N-(N-methylimidazolyl-2-methyl)]aminomethyl-4-methylphenol], an unsymmetrical N4O2 donor ligand} has been synthesized and fully characterized by several spectroscopic techniques as well as by X-ray crystallography. The crystal structure of the complex reveals that both metal centers in 1 are six-coordinate with the chloride ion occupying the sixth coordination site of the MnII ion. The phenoxide moiety of the ICIMP ligand and both acetate ligands bridge the two metal ions of the complex. Mössbauer spectroscopy shows that the iron ion in 1 is high-spin FeIII. Two quasi-reversible redox reactions for the complex, attributed to the FeIIIMnII/FeIIMnII (at –0.67 V versus Fc/Fc+) and FeIIIMnII/FeIIIMnIII (at 0.84 V), were observed by means of cyclic voltammetry. Complex 1, with an FeIII–MnII distance of 3.58 Å, may serve as a model for the mixed-valence oxidation state of purple acid phosphatase from sweet potato. The capability of the complex to effect organophosphate hydrolysis (phosphatase activity) has been investigated at different pH levels (5.5–11) by using bis(2,4-dinitrophenyl)phosphate (BDNPP) as the substrate. Density functional theory calculations indicate that the substrate coordinates to the MnII ion. In the transition state, a hydroxide ion that bridges the two metal ions becomes terminally coordinated to the FeIII ion and acts as a nucleophile, attacking the phosphorus center of BDNPP with the concomitant dissociation of the leaving group.
    Berichte der deutschen chemischen Gesellschaft 05/2014; 2014(13):n/a-n/a. DOI:10.1002/ejic.201301375
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    ABSTRACT: A series of novel neutral and cationic methylpalladium complexes bearing N-alkyl-2,2′-dipyridylaldiminato ligands were prepared and characterized. In the presence of ethylene, the cationic complexes were active as dimerization catalysts, producing a mixture of 1- and 2-butenes. A Pd–ethyl π-ethylene species was identified as the catalyst resting state by low-temperature spectroscopic and DFT studies, which provided insights into the effect of both steric and electronic factors on the observed reactivity.
    Organometallics 04/2014; 33(9). DOI:10.1021/om5001293
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    Biswanath Das, Matti Haukka, Ebbe Nordlander
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    ABSTRACT: The binuclear title complex, [Zn2(C33H33N6O)(CH3COO2)(CH3OH)](ClO4)2, was synthesized by the reaction between 2,6-bis-({[bis-(pyridin-2-yl)meth-yl]amino}-meth-yl)-4-methyl-phenol (H-BPMP), Zn(OAc)2 and NaClO4. The two Zn(II) ions are bridged by the phenolate O atom of the octadentate ligand and the acetate group. An additional methanol ligand is terminally coordinated to one of the Zn(II) ions, rendering the whole structure unsymmetric. Other symmetric dizinc complexes of BPMP have been reported. However, to the best of our knowledge, the present structure, in which the two Zn(II) ions are distinguishable by the number of coordinating ligands and the coordination geometries (octahedral and square-pyramidal), is unique. The dizinc complex is a dication, and two perchlorate anions balance the charge. The -OH group of the coordinating methanol solvent mol-ecule forms a hydrogen bond with a perchlorate counter-anion. One of the anions is disordered over two sets of sites with an occupancy ratio of 0.734 (2):0.266 (2).
    Acta Crystallographica Section E Structure Reports Online 04/2014; 70(Pt 4):m120-1. DOI:10.1107/S1600536814004279
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    ABSTRACT: The mixed-valence triiron complexes [Fe3(CO)7-x (PPh3) x (μ-edt)2] (x = 0-2; edt = SCH2CH2S) and [Fe3(CO)5(κ(2)-diphosphine)(μ-edt)2] (diphosphine = dppv, dppe, dppb, dppn) have been prepared and structurally characterized. All adopt an anti arrangement of the dithiolate bridges, and PPh3 substitution occurs at the apical positions of the outer iron atoms, while the diphosphine complexes exist only in the dibasal form in both the solid state and solution. The carbonyl on the central iron atom is semibridging, and this leads to a rotated structure between the bridged diiron center. IR studies reveal that all complexes are inert to protonation by HBF4·Et2O, but addition of acid to the pentacarbonyl complexes results in one-electron oxidation to yield the moderately stable cations [Fe3(CO)5(PPh3)2(μ-edt)2](+) and [Fe3(CO)5(κ(2)-diphosphine)(μ-edt)2](+), species which also result upon oxidation by [Cp2Fe][PF6]. The electrochemistry of the formally Fe(I)-Fe(II)-Fe(I) complexes has been investigated. Each undergoes a quasi-reversible oxidation, the potential of which is sensitive to phosphine substitution, generally occurring between 0.15 and 0.50 V, although [Fe3(CO)5(PPh3)2(μ-edt)2] is oxidized at -0.05 V. Reduction of all complexes is irreversible and is again sensitive to phosphine substitution, varying between -1.47 V for [Fe3(CO)7(μ-edt)2] and around -1.7 V for phosphine-substituted complexes. In their one-electron-reduced states, all complexes are catalysts for the reduction of protons to hydrogen, the catalytic overpotential being increased upon successive phosphine substitution. In comparison to the diiron complex [Fe2(CO)6(μ-edt)], [Fe3(CO)7(μ-edt)2] catalyzes proton reduction at 0.36 V less negative potentials. Electronic structure calculations have been carried out in order to fully elucidate the nature of the oxidation and reduction processes. In all complexes, the HOMO comprises an iron-iron bonding orbital localized between the two iron atoms not ligated by the semibridging carbonyl, while the LUMO is highly delocalized in nature and is antibonding between both pairs of iron atoms but also contains an antibonding dithiolate interaction.
    Organometallics 03/2014; 33(6):1356-1366. DOI:10.1021/om400691q
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    ABSTRACT: The reactivity of the σ,π-furyl complex [Fe2(CO)6(μ-Fu)(μ-PFu2)] (1) towards PPh3 and a range of bidentate phosphines has been studied and a number of different reaction products have been identified. With PPh3, carbonyl substitution affords [Fe2(CO)5(PPh3)(μ-Fu)(μ-PFu2)] (2) in which the new phosphine is coordinated to the iron center that is σ-coordinated by the bridging furyl moiety. With small bite-angle diphosphines – bis(diphenylphosphino)methane (dppm) and 1,8-bis(diphenylphosphino)naphthalene (dppn) – carbonyl substitution and migratory carbonyl insertion result to give the furyl–acyl complexes with bridging, [Fe2(CO)4(μ-dppm)(μ-OCFu)(μ-PFu2)] (3), or chelating, [Fe2(CO)4(κ2-dppn)(μ-OC–Fu)(μ-PFu2)] (4), diphosphines, respectively. With the more flexible diphosphines Ph2P(CH2)nPPh2 (n = 2, dppe, n = 3, dppp), the cyclometallated products [Fe2(CO)5{μ,κ2-C6H4PPh(CH2)nPPh2}(μ-PFu2)] (n = 2, 5; n = 3, 6) are isolated as a result of carbonyl substitution and furan elimination, and a similar complex [Fe2(CO)5{μ,κ2-C6H4PPh(C6H4)PPh2}(μ-PFu2)] (7) is generated from the more rigid diphosphine bis(diphenylphosphino)benzene (dppb). With bis(diphenylphosphino)-1,1-binaphthalene (1,1-BINAP) the novel tridentate phosphine complex [Fe2(CO)5{μ,κ3-C6H4P(C20H12PPh2)C6H4PFu}] (8) results from the putative coupling of cyclometallated diphosphine and difurylphosphido ligands, following elimination of two equivalents of furan. The crystal structures of 2, 3, 5 and 8 have been determined and allow a detailed insight into the overall reaction profile.
    Journal of Organometallic Chemistry 02/2014; 751. DOI:10.1016/j.jorganchem.2013.05.026
  • Journal of Organometallic Chemistry 02/2014; 751:399-411. DOI:10.1016/j.jorganchem.2013.08.027
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    ABSTRACT: Ten rhenium carbonyl complexes—[Re(H)(CO)3(1a)], [Re3(µ-H)3(CO)10(1a)], [Re2(CO)9(2a)], [Re2(CO)8(2a)], [Re2(CO)9(2b)], [{Re2(CO)9}2(2b)], [Re2(CO)8(2b)], [Re2(CO)8(1b)], [Re2(µ-H)2(CO)6(2b)] and [Re3(µ-H)3(CO)11(2b)]—containing different bidentate chiral phosphine ligands of the Josiphos (1a, 1b) and Walphos (2a, 2b) families have been synthesized and fully characterized (1a: (R)-1-{(S P)-2-[Bis[3,5-bis(trifluoromethyl)phenyl]phosphino]ferrocenyl}ethyldi(3,5-xylyl)phosphine, 1b: (R)-1-{(S P)-2-[Di(2-furyl)phosphino]ferrocenyl}ethyldi-tert-butylphosphine, 2a: (R)-1-{(R P)-2-[2-[Bis(4-methoxy-3,5-dimethylphenyl)phosphino]phenyl]ferrocenyl}ethylbis[3,5-bis(trifluoromethyl)phenyl]phosphine and 2b: (R)-1-{(R P)-2-[2-(Diphenylphosphino)phenyl]ferrocenyl}ethyldicyclohexylphosphine). The phosphine-substituted clusters were tested for hydrogenation of tiglic acid [trans-2-methyl-2-butenoic acid]. The catalytic reactions gave reasonable conversion rates (15–88 %) under relatively mild conditions but relatively moderate enantiomeric excesses (8–57 %) were observed. The crystal structures of [ReH(CO)3(1a)], [Re2(CO)9(2a)], [{Re2(CO)9}2(2b)] and [Re2(µ-H)2(CO)6(2b)] are presented.
    Journal of Cluster Science 01/2014; DOI:10.1007/s10876-014-0809-y
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    ABSTRACT: A new iron complex mediates stereospecific hydroxylation of alkyl C-H bonds with hydrogen peroxide, exhibiting excellent efficiency. Isotope labelling studies provide evidence that the relative reactivity of tautomerically related oxo-iron species responsible for the C-H hydroxylation reaction is dominated by steric factors.
    Chemical Communications 11/2013; 50(12). DOI:10.1039/c3cc47830k
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    ABSTRACT: The dinuclear complex [Zn2(DPCPMP)(pivalate)](ClO4), where DPCPMP is the new unsymmetrical ligand [2-(N-(3-((bis((pyridin-2-yl)methyl)amino)methyl)-2-hydroxy-5-methylbenzyl)-N-((pyridin-2-yl)methyl)amino)acetic acid], has been synthesized and characterized. The complex is a functional model for zinc phosphoesterases with dinuclear active sites. The hydrolytic efficacy of the complex has been investigated using bis-(2,4-dinitrophenyl)phosphate (BDNPP), a DNA analog, as substrate. Speciation studies using potentiometric titrations have been performed for both the ligand and the corresponding dizinc complex to elucidate the formation of the active hydrolysis catalyst; it reveals that the dinuclear zinc(II) complexes, [Zn2(DPCPMP)](2+) and [Zn2(DPCPMP)(OH)](+) predominate the solution above pH4. The relatively high pKa of 8.38 for water deprotonation suggests that a terminal hydroxide complex is formed. Kinetic investigations of BDNPP hydrolysis over the pH range 5.5-11.0 and with varying metal to ligand ratio (metal salt:ligand=0.5:1 to 3:1) have been performed. Variable temperature studies gave the activation parameters ΔH(‡)=95.59kJmol(-1), ΔS(‡)=-44.82Jmol(-1)K(-1), and ΔG(‡)=108.00kJmol(-1). The cumulative results indicate the hydroxido-bridged dinuclear Zn(II) complex [Zn2(DPCPMP)(μ-OH)](+) as the effective catalyst. The mechanism of hydrolysis has been probed by computational modeling using density functional theory (DFT). Calculations show that the reaction goes through one concerted step (SN2 type) in which the bridging hydroxide in the transition state becomes terminal and performs a nucleophilic attack on the BDNPP phosphorus; leaving group dissociates simultaneously in an overall inner sphere type activation. Calculated free energy barrier is in good agreement with the experimentally determined activation parameters.
    Journal of inorganic biochemistry 08/2013; 132. DOI:10.1016/j.jinorgbio.2013.08.001
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    ABSTRACT: The dinuclear complex [Zn2(papy)2]·2CH3OH [H2papy = N-(2-hydroxybenzyl)-N-(2-picolyl)glycine] was synthesized and characterized. The crystal structure of the complex reveals that both ZnII ions are pentacoordinate with distorted pentagonal bipyramidal coordination arrangements. The phenoxyl groups of each ligand bridge the two metal atoms, whereas each carboxylate of the ligand is terminally bound to one ZnII ion. Potentiometric studies of the ZnII:H2papy system in a methanol/water mixture show the existence of a mononuclear species at lower pH; but at a pH above 5, a dimeric species starts to dominate and transforms further into a bis(μ-phenoxo) bridged dizinc complex by deprotonation of phenolic hydrogen. A kinetic study of the hydrolysis of bis(2, 4-dinitrophenyl)phosphate at different pH, catalyzed by complex 1, indicates a maximum rate at pH 9, where the bis(μ-phenoxo)-bridged dizinc species corresponding to 1 dominates in solution.
    Zeitschrift für anorganische Chemie 07/2013; 639(8‐9). DOI:10.1002/zaac.201300160
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    ABSTRACT: The title compound, C14H16N6O2, is a second monoclinic polymorph of 2-[1-(3,5-dimeth-yl)pyrazol-yl]-2-hy-droxy-imino-N'-[1-(2-pyrid-yl)ethyl-idene] acetohydrazide, with two crystallographically independent mol-ecules per asymmetric unit. The non-planar mol-ecules are chemically equal having similar geometric parameters. The previously reported polymorph [Plutenko et al. (2012 ▶). Acta Cryst. E68, o3281] was described in space group Cc (Z = 4). The oxime group and the O atom of the amide group are anti with respect to the C-C bond. In the crystal, mol-ecules are connected by N-H⋯N hydrogen bonds into zigzag chains extending along the b axis.
    Acta Crystallographica Section E Structure Reports Online 05/2013; 69(Pt 5):o765-6. DOI:10.1107/S1600536813009628
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    ABSTRACT: Reaction of [Os3(CO)11(NCMe)] with bis-diphenylphosphanylethylene sulfide, {Ph2PCH2CH2}2S (PSP), leads to the formation of [Os3(CO)11(PSP)] and [{Os3(CO)11}2(μ-PSP)] in good yield. Similarly, treatment of [Os3(CO)10(NCMe)2] with PSP affords the cluster [Os3(CO)10(μ-PSP)], in which the two phosphanes of the PSP ligand coordinate to different osmium atoms of the same triosmium unit. Reaction of [Os3(CO)11(PSP)] with [Os3(CO)10(NCMe)2] yields the compound 1,2-[{Os3(CO)11}(μ3-PSP){Os3(CO)10}] in which the thioether moiety and one of the phosphane groups of the PSP ligand are coordinated equatorially to the {Os3(CO)10} subunit. The cluster 1,2-[{Os3(CO)11}(μ3-PSP){Os3(CO)10}] is also formed when [Os3(CO)11(PSP)] is oxidatively decarbonylated by reaction with trimethylamine N-oxide. The metastable cluster 1,2-[{Os3(CO)11}(μ3-PSP){Os3(CO)10}] undergoes slow isomerisation at room temperature to form 1,1-[{Os3(CO)11}(μ3-PSP){Os3(CO)10}] in which the thioether and phosphane moieties coordinate in a chelating mode to one of the {Os3(CO)10} subunits with the thioether moiety in an axial position. The dynamic behaviour of these clusters has been investigated by variable-temperature 13C{1H} and 13P{1H} NMR spectroscopy. The solid-state structures of [{Os3(CO)11}2(μ-PSP)] and [Os3(CO)10(μ-PSP)] are reported.
    Berichte der deutschen chemischen Gesellschaft 05/2013; 2013(13). DOI:10.1002/ejic.201201403
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    ABSTRACT: Treatment of [Fe3(CO)12] with tri(2-furyl)phosphine (PFu3) or tri(2-thienyl)phosphine (PTh3) in dichloromethane at 40 °C leads to facile phosphorus–carbon bond scission affording di-iron furyl- and thienyl-bridged complexes [Fe2(CO)6(μ-η1,η2-C4H3E){μ-P(C4H3E)2}] (1 E = O, Fu; 3 E = S, Th) in good yields, together with smaller amounts of the phosphine-substituted [Fe2(CO)5(μ-η1,η2-C4H3E){μ-P(C4H3E)2}{P(C4H3E)3}] (2 E = O, 4 E = S). When the same reactions were carried out at room temperature, small amounts of the tri-iron clusters [Fe3(CO)11{P(C4H3E)3}] (5 E = O, 6 E = S) were isolated in which the coordinated phosphine(s) remain intact. Thermolysis of [Fe3(CO)11{P(C4H3E)3}] at 40 °C in dichloromethane gave [Fe2(CO)6(μ-η1,η2-C4H3E){μ-P(C4H3E)2}], which also undergo phosphine substitution under similar conditions. However, both of these processes are too slow to account for the reaction product ratios and yields observed in the room temperature reactions. In contrast, addition of catalytic amounts of Na+[Ph2CO] to 5 resulted in the rapid formation of 1. We therefore propose that these reactions may occur via a radical-initiated mechanism proceeding through the initial formation of the 49-electron radical anions [Fe3(CO)11{P(C4H3E)3}]. The crystal structures of [Fe2(CO)6(μ-η1,η2-Fu)(μ-PFu2)] (1), [Fe2(CO)5(μ-η1,η2-Fu)(μ-PFu2)(PFu3)] (2), [Fe2(CO)6(μ-η1,η2-Th)(μ-PTh2)] (3) and [Fe3(CO)11(PFu3)] (5) have been determined. The di-iron complexes all show the expected cis arrangement of three-electron donor ligands, short iron–iron distances consistent with a 34-valence electron count, and, in 2, the phosphine is coordinated to the π-bound iron atom and lies trans to the metal–metal bond. Close inspection of the bonding parameters within the Fe2C2E core reveals that these alkenyl species are quite different to those without electron-withdrawing substituents. The tri-iron cluster 5 has two independent molecules in the asymmetric unit. Each contains two bridging carbonyls and the molecules differ in the relative positions of these carbonyls and the coordinated phosphine ligand, the latter lying in the equatorial plane in both molecules.
    Journal of Organometallic Chemistry 04/2013; 730:123-131. DOI:10.1016/j.jorganchem.2012.11.024
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    ABSTRACT: In the title compound, CHNO, the dihedral angles formed by the mean plane of the acetohydrazide group [maximum deviation 0.0629 (12) Å] with the pyrazole and pyridine rings are 81.62 (6) and 38.38 (4)° respectively. In the crystal, mol-ecules are connected by N-H⋯O and O-H⋯N hydrogen bonds into supra-molecular chains extending parallel to the -axis direction.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 68(Pt 12):o3381. DOI:10.1107/S1600536812045412

Publication Stats

1k Citations
448.53 Total Impact Points

Institutions

  • 1997–2015
    • Lund University
      • • Department of Physical Chemistry
      • • Center for Chemistry and Chemical Engineering
      • • Department of Organic Chemistry
      Lund, Skåne, Sweden
  • 2001–2010
    • Saint-Petersburg State Institute of Technology
      Sankt-Peterburg, St.-Petersburg, Russia
    • University of Lisbon
      Lisboa, Lisbon, Portugal
  • 1996–2008
    • University of Cambridge
      • Department of Chemistry
      Cambridge, England, United Kingdom
  • 2000–2007
    • University of Joensuu
      • Department of Chemistry
      Yoensu, Eastern Finland Province, Finland
  • 2005–2006
    • Jahangirnagar University
      • Department of Chemistry
      Mujib City, Dhaka, Bangladesh
    • University College London
      • Department of Chemistry
      Londinium, England, United Kingdom
  • 1999–2003
    • The University of Warwick
      • Department of Chemistry
      Coventry, England, United Kingdom
  • 2002
    • Russian Academy of Sciences
      • Institute of the Problems of Chemical Physics
      Moskva, Moscow, Russia
  • 1998–1999
    • Harvard University
      • Department of Chemistry and Chemical Biology
      Cambridge, Massachusetts, United States