Hong-Gen Wang

Nankai University, T’ien-ching-shih, Tianjin Shi, China

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Publications (132)98.33 Total impact

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    ABSTRACT: Bis(hexafluoroacetylacetonate)cobalt(II), Co(hfac)2, reacted with the nitronyl nitroxide radical 2-(4-methylphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, NITPhMe, to yield an octahedral adduct of formula Co(hfac)2(NITPhMe)2. The X-ray crystal structure shows that it crystallizes in the space group P1, with a = 9.837(3), b = 11.618(3), c = 20.502(4) Å, α = 81.22(2), β = 87.93(2), γ = 72.24(3)º, V = 2205(1) Å3, Z = 2. The mechanism of ferromagnetic exchange between cobalt(II) and the radical can be qualitatively understood in terms of a charge-transfer interaction (J being 25.7 cm-1, the Hamiltonian is written in the form H = -2J(SRad1·SCo + SCo·SRad2)).Key words: crystal structure, cobalt(II) complex, nitronyl nitroxide, magnetic property.
    Canadian Journal of Chemistry 02/2011; 78(3):322-327. · 0.96 Impact Factor
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    ABSTRACT: A bimetallic compound [Cu(en)2Mn(NCS)4(H2O)2]n (en = ethylenediamine) has been prepared and its structure determined. It crystallizes in space group , with a = 7.432(1), b = 7.492(1), c = 9.751(2) Å, α = 91.00(3)°, ß = 99.14(3)°, γ = 112.51(3)°, and Z = 1. The structure consists of one-dimensional chains in which alternating Mn(II) and Cu(II) ions are bridged by NCS ligands. The coordination environment is octahedral for Mn(II) and elongated octahedral for Cu(II). From magnetic susceptibility measurements the compound was found to exhibit a ground state of low-spin multiplicity. Comparison between theory and experimental has been made using 1-D model and taking into account the zero-field splitting effect. The decrease in chimT observed at low temperature for the compound is attributed to a dominant zero-field splitting of the single Mn(II) ions with a weak antiferromagnetic interaction superimposed between the Mn(II) ions via the NCS-Cu-SCN pathway within each chain. Key words: crystal structure, copper(II) complexes, manganese(II) complexes, thiocyanate bridges, bimetallic complexes.
    Canadian Journal of Chemistry 02/2011; 76(7):1102-1107. · 0.96 Impact Factor
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    ABSTRACT: 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 01/2010; 30(8).
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    ABSTRACT: A number of fluorescent 3-aryl-1-methylquinolinones 3 were synthesized by the regiospecific photocoupling reaction of 3-halo-1-methylquinolinones 1 with aromatic and heteroaromatic compounds 2. An unusual photocoupling product 4 was obtained in the photolysis of 3-iodo-1-methylquinolinone in the presence of benzene. The structure of 4 was unequivocally established by an X-ray crystallographic analysis.
    Journal of Heterocyclic Chemistry 03/2009; 28(6):1481 - 1484. · 1.22 Impact Factor
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    ABSTRACT: Abstract— Solid-state irradiation of mixed crystals prepared by meltinga 1:3 molar mixture of indole and phenanthrene followed by resolidifying the melt gave an adduct 2a in 13.5% yield. An adduct 2b was obtained by irradiation of the mixed crystals of 3-methylindole and phenanthrene. Irradiation of the same mixtures of indoles and phenanthrene in solution gave no photoproduct. Irradiation of the mixed crystals of indole and naphthalene gave a similar photoadduct 3a, which was also formed in solution. The 1:1 mixed crystals of indole and phenanthrene and of indole and naphthalene were characterized by various spectroscopic methods. Among them powder X-ray diffraction spectral analysis and differential scanning calorimetry revealed that the former mixed crystal is a simple mixture of microcrystals of indole and phenanthrene, while the latter forms a molecular compound.
    Photochemistry and Photobiology 01/2008; 57(4):597 - 602. · 2.29 Impact Factor
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    ABSTRACT: Two novel cadmium complexes [Cd3(pta)2(H2O)4]n (1) (H3pta=2,4,6-pyridinetricarboxylic acid) and {[Cd(H2pza)(H2O)2]·2H2O}n (2) (H4pza=2,3,5,6-pyrazinetetracarboxylic acid) were synthesized. In both complexes, Cd(II) ions show three different coordination numbers of six and seven in 1 and eight in 2, respectively. Complex 1 displays a three-dimensional network structure and 2 shows a one-dimensional chain structure. The one-dimensional chains in 2 are vertical or parallel to each other and form a three-dimensional network structure by hydrogen bonds. In addition, 1 emits intense fluorescence on excitation of 342nm.
    Inorganic Chemistry Communications - INORG CHEM COMMUN. 01/2007; 10(8):856-859.
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    ABSTRACT: A novel 3D porous MOF built with trinuclear cadmium clusters exhibiting rhombohedral topology has been synthesized and characterized as a promising luminescent material that can give tunable emissions between UV and visible wavelengths by controlling the number of guest molecules.
    Chemical Communications 01/2007; · 6.38 Impact Factor
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    ABSTRACT: The oxovanadium(IV)-lanthanide(III) heteronuclear complexes, [[Ce(H2O)7(VO)(TTHA)0.5][(VO)2(TTHA)]].8H2O (2), [Pr(H2O)7(VO)3(TTHA)1.5].10H2O (3), and [Nd(H2O)7(VO)3(TTHA)(1.5)].10H2O (4) (H6TTHA = triethylenetetraaminehexaacetic acid), were prepared based on a binuclear building block of [(VO)2(TTHA)]2- in [VO(H2O)5][(VO)2TTHA].4H2O (1). The X-ray crystallographic studies show that 1 is an ion-pair complex, containing the [(VO)2(TTHA)]2- unit as a useful building block. Adding the light Ln3+ ions to this synthesis system, three new 3d-4f mixed-metal-based complexes were obtained. Although the light lanthanide ions always exhibit similar chemical behavior, the structures of 2-4 are not homologous. 2 is exhibited as a one-dimensional coordination polymer, comprising an unusual Ce2V2 heterometallic lattice in the chain structure, which is the second report of a oxovanadium(IV)-lanthanide(III) coordination polymer. 3 and 4 are isomorphic, every two of the Ln3+ cations linked three [(VO)2(TTHA)]2- anions, forming an interesting linear octanuclear structure. This kind of heteronuclear linear complex is rather rare, which expands the realm of 3d-4f complexes. Further investigations such as IR spectra, UV-vis spectra, magnetic properties, and EPR spectra were studied, and a detailed discussion is given for this system.
    Inorganic Chemistry 06/2006; 45(10):3949-57. · 4.59 Impact Factor
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    ABSTRACT: Using two 4-substitued triazole ligands, 4-(pyrid-2-yl)-1,2,4-triazole (L(1)) and 4-(pyrid-3-yl)-1,2,4-triazole (L(2)), a series of novel triazole-cadmium(II) complexes varying from zero- to three-dimensional have been prepared and their crystal structures determined via single-crystal X-ray diffraction. [Cd(2)(micro(2)-L(1))(3)(L(1))(2)(NO(3))(mu(2)-NO(3))(H(2)O)(2)](NO(3))(2).1.75H(2)O (1) is a binuclear complex containing bidendate, monodedate and free nitrate anions. When the bridging anions SCN(-) and dca (dca = N(CN)(2)(-)) were added to the reaction system of 1, one-dimensional (1D) [Cd(L(1))(2)(NCS)(2)](n) (2) and two-dimensional (2D) [Cd(L(1))(2)(dca)(2)](n) (3) were isolated, respectively. When L(2) instead of L(1) was used, [Cd(L(2))(2)(NCS)(2)(H(2)O)(2)] (4) and 1D [Cd(L(2))(2)(dca)(2)](n) (5) were obtained. When the ratio of Cd to L(2) was changed from 1:2 to 1:1 in the reaction system of 5, three-dimensional (3D) {[Cd(3)(micro(2)-L(2))(3)(dca)(6)].0.75H(2)O}(n) (6) with 1D microporous channels along the a direction was isolated. Further investigations on other Cd(ii) salts and the L(2) ligand in a Cd to L(2) ratio of 1:1, an unexpected complex [Cd(mu(2)-L(2))(mu(3)-SO(4))(H(2)O)](n) (7) with a 3D open framework was obtained. All of the complexes exhibit strong blue fluorescence emission bands in the solid state at ambient temperature, of which the excitation and emission maxima are red-shifted to longer wavelength as compared to those in water. Powder X-ray diffraction and thermal studies were used to investigate the bulk nature of the 3D coordination polymers 6 and 7.
    Dalton Transactions 03/2006; · 3.81 Impact Factor
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    ABSTRACT: Two novel complexes [Ni2(H2O)2(H2TTHA)] · 6H2O (1), and {[Cu3(H2O)4(TTHA)] · 8H2O}n (2) were synthesized and characterized by X-ray single-crystal diffraction, elemental analysis, IR and UV–vis spectra. 1 is a binuclear complex while 2 exhibits one-dimensional (1D) coordination polymer.
    Inorganic Chemistry Communications 02/2006; 9(2):192–195. · 2.02 Impact Factor
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    ABSTRACT: A new series of oxovanadium(IV)-lanthanide(III) heteronuclear complexes [Yb(H2O)8]2[(VO)2(TTHA)](3)21 H2O (1), {[Ho(H2O)7(VO)2(TTHA)][(VO)2(TTHA)](0.5)} 8.5 H2O (2), {[Gd(H2O)7(VO)2(TTHA)][(VO)2(TTHA)](0.5)}8.5 H2O (3), {[Eu(H2O)7][(VO)2(TTHA)](1.5)} 10.5 H2O (4), and [Pr2(H2O)6(SO4)2][(VO)2(TTHA)] (5) (H6TTHA=triethylenetetraaminehexaacetic acid) were prepared by using the bulky flexible organic acid H(6)TTHA as structure-directing agent. X-ray crystallographic studies reveal that they contain the same [(VO)2(TTHA)]2- unit as building block, but the Ln3+ ion lies in different coordination environments. Although the lanthanide ions always exhibit similar chemical behavior, the structures of the complexes are not homologous. Compound 1 is composed of a [Yb(H2O)8]3+ ion and a [(VO)2(TTHA)]2- ion. Compounds 2 and 3 are isomorphous; both contain a trinuclear [Ln(H2O)7(VO)2(TTHA)]+ (Ln=Ho for 2 and Gd for 3) ion and a [(VO)2(TTHA)]2- ion. Compound 4 is an extended one-dimensional chain, in which each Eu3+ ion links two [(VO)2(TTHA)]2- ions. For 5, the structure is further assembled into a three-dimensional network with an interesting framework topology comprising V2Pr2 and V4Pr2 heterometallic lattices. Moreover, 4 and 5 are the first oxovanadium(IV)-lanthanide(III) coordination polymers and thus enlarge the realm of 3d-4f complexes. The IR, UV/Vis, and EPR spectra and the magnetic properties of the heterometallic complexes were studied. Notably, 2 shows unusual ferromagnetic interactions between the VO2+ and Ho3+ ions.
    Chemistry 09/2005; 11(17):5031-9. · 5.83 Impact Factor
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    ABSTRACT: The syntheses, crystal structures, and magnetic properties of three novel cyano-bridged bimetallic assemblies, [Ni(bpm)(2)](3)[Co(CN)(6)](2)x3.5H(2)O (1), [Co(bpm)(2)][Fe(CN)(5)NO]x2H(2)O (2), and [Co(bpm)(2)][Ni(CN)(4)] (3) (bpm = bis(1-pyrazolyl)methane), are reported. Complex 1 crystallizes in the tetragonal space group P4(3)2(1)2 with a = 12.800(5) A, b = 12.800(5) A, c = 42.80(3) A, V = 7012(6) A(3), and Z = 8. Complex 2 crystallizes in the chiral trigonal space group P3(2)21 with a = 11.9961(19) A, b = 11.9961(19) A, c = 16.062(5) A, gamma = 120 degrees , V = 2001.7(8) A(3), and Z = 3. Complex 1 is a trigonal bipyramidal complex in which three [Ni(bpm)(2)](2+) units are situated in the equatorial plane and are connected to the two apical [Co(CN)(6)](3)(-) units via three N ends of the cyanide groups. Complex 2 possesses a triangular left-handed helical chain structure composed of [Co(bpm)(2)](2+) linked by [Fe(CN)(5)NO](2)(-); the shortest intramolecular Co...Fe distance is 5.162 A. To the best of our knowledge, this is the first observation of a heteronuclear helical chain structure based on pentacyanonitrosylferrate(II). The structure of complex 3 is roughly determined by X-ray crystallograhy analysis to be a 1D zigzag chain. These structure variations, from a discrete cluster to a 1D helical chain and a 1D zigzag chain, rely on the semirigidity of the capping ligand bpm. Magnetic susceptibility measurements indicate that complex 1 has an intramolecular ferromagnetic interaction (J = 4.06 cm(-)(1)) between the nickel(II) ions; this is further confirmed by the magnetization measurements. In complexes 2 and 3, the cobalt(II) ions are located in a moderately strong field.
    Inorganic Chemistry 07/2005; 44(12):4263-9. · 4.59 Impact Factor
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    ABSTRACT: Four novel triarylbismuth(V) di(N-salicylidene)amino carboxylates were synthesized. Their structures were confirmed by IR, 1H NMR, 13C NMR and elemental analysis. The crystal structure of (2-HOC6H4CHNCH2CO2)2BiPh3 was determined by X-ray diffraction. The in vitro cytotoxicity of all compounds against three human cancer cells (HL-60, BGC-823 and MDA-MB-435) at 10 µM are reported. Copyright © 2005 John Wiley & Sons, Ltd.
    Applied Organometallic Chemistry 01/2005; 19(1):113 - 117. · 2.01 Impact Factor
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    ABSTRACT: The molecular structure of a novel manganese complex with 4-(pyridine-2)-1,2,4-triazole has been determined by X-ray analysis. Crystals are triclinic, space group , with a = 10.397(4), b = 12.033, c = 13.920(5) Å, α = 115.325(5), β = 90.449(6), γ = 109.379(7)°, V = 1461.8(9) Å3, Z = 2, R1 = 0.0569, wR2 = 0.1113. The manganese atom lies in a distorted octahedral environment. Two ligand molecules coordinate axially and two cis-oriented thiocyanate anions and cis-oriented water molecules coordinate to the metal centre. The crystal is stabilized by intramolecular π–π stacking and hydrogen bonding. Magnetic measurements show the complex is a high-spin species in the 77–300 K range.
    Journal of Coordination Chemistry 06/2004; 57(9):771-776. · 1.80 Impact Factor
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    ABSTRACT: The new ligand, N,N′-dibenzyl-1,10-phenanthroline-2,9-dimethylamine trihydrochloric acid monohydrate (L · 3HCl·H 2O), has been synthesized and characterized. Complexes of the ligand (L) with CuII and MnII were prepared and their crystal structures were determined. The copper ion is five-coordinated via three nitrogen atoms of the ligand and two chloride ions, while the manganese ion is six-coordinated by three nitrogens of the ligand, two chloride ions and one water molecule. In both complexes, the ligand behaves in a tri-dentate fashion and the uncoordinated nitrogen of the other arm is protonated.
    Transition Metal Chemistry 04/2004; 29(3). · 1.40 Impact Factor
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    ABSTRACT: A novel homodinuclear complex [(tacn)Cr(μ-OH)2(μ-CO3)Cr(tacn)](ClO4)2·3H2O (tacn = 1,4,7-triazacyclononane) has been synthesized and characterized by single-crystal X-ray diffraction analysis. The complex crystallizes in space group Pnma, with a = 14.323(2), b = 21.958(3), c = 9.0092(14) Å, Z = 4, R1 = 0.0552, wR2 = 0.1222. The structure consists of the binuclear cation [(tacn)Cr(μ-OH)2(μ-CO3)Cr(tacn)], uncoordinated perchlorate anions and lattice water molecules. Metal centres are linked together by two hydroxo bridges and one carbonato bridge and there are intramolecular Cr–Cr interactions. The geometry around each chromium(III) ion is distorted octahedral. Hydrogen atoms of two neighbouring 1,4,7-triazacyclononane ligands connect with the uncoordinated oxygen atom of the carbonato group through hydrogen bonds to form a 1-D chain. Measurements of variable-temperature (2–300 K) magnetic susceptibilities show an antiferromagnetic interaction between Cr(III) ions.
    Journal of Coordination Chemistry 01/2004; 57(3):231-237. · 1.80 Impact Factor
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    ABSTRACT: The reaction of 3(5)-methylthio-5(3)-phenylpyrazole with dibromomethane under phase-transfer catalytic conditions only affords a new ligand, bis(3-phenyl-5-methylthiopyrazol-1-yl)methane. However, the reaction of 3(5)-methylthio-5(3)-p-methoxyphenylpyrazole or 3(5)-methylthio-5(3)-tert-butylpyrazole with dibromomethane under the same conditions yields three isomers, respectively, indicating that the substituents significantly affect the steric and electronic properties of pyrazole ring during the formation of ligands. Treatment of these potential polydentate ligands with M(CO)6 (M=Cr, Mo or W) under UV irradiation at room temperature affords (NN)M(CO)4 derivatives, in which some complexes contain asymmetric substituted bis(pyrazol-1-yl)methane ligands. The X-ray crystal structure analyses indicate that the sulfur atoms in these complexes do not take part in the coordination to the metal centers, and S-rich bis(pyrazol-1-yl)methanes actually act as bidentate chelating ligands by two nitrogen atoms. It is also interesting that in order to reduce the repulsion of methyl groups with carbonyls, the methyl groups in these complexes are oriented away from the metal centers.
    Journal of Organometallic Chemistry 04/2002; 649(2):152-160. · 2.00 Impact Factor
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    ABSTRACT: The Mn(II) and Zn(II) complexes of N,N′-diisopropyl-1,10-phenanthroline-2,9-dimethanamine have been synthesised, and the structure of the two complexes have been studied by X-ray crystallography.
    Journal of Molecular Structure 02/2002; 605(1):117–122. · 1.40 Impact Factor
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    ABSTRACT: The reaction of bis(3,5-dimethyl-1,2,4-triazol-1-yl)methane, CH2(3,5-Me2Tz)2, with M(CO)6 (M=Cr, Mo or W) in refluxing DME produces CH2(3,5-Me2Tz)2M(CO)4 in moderate yield. The crystal structures determined by X-ray analysis show that bis(3,5-dimethyl-1,2,4-triazol-1-yl)methane acts as a chelating bidentate ligand with two endodentate nitrogen atoms in these complexes. Reactions of complexes CH2(3,5-Me2Tz)2M(CO)4 (M=Mo or W) with R2SnX2 (R=Ph or Me; X=Cl or Br) in a 1:1 or 1:2 ratio, respectively, only yield 1:1 adducts. In these adducts, bis(3,5-dimethyl-1,2,4-triazol-1-yl)methane may coordinate to tin atom through exodentate nitrogen atoms on the 4-position of triazole rings to form linkage coordination polymers. Possibly owing to weak donors of 4-position exonitrogen atoms on triazole rings to organotin acceptors, the dissociation of these adducts in solution could exist. Adduct of CH2(3,5-Me2Tz)2W(CO)4·SnPh2Br2 absorbs one water molecule while crystals are growing and becomes the hydrolysis product [SnPh2Br2(H2O)]·(CH2(3,5-Me2Tz)2W(CO)4), which is characterized by X-ray crystallography, indicating that tin atom is five coordinate with a trigonal bipyramid geometry, the water molecule coordinates to the tin atom, and is simultaneously connected to the exonitrogen atoms on the 4-position of triazole rings of two adjacent CH2(3,5-Me2Tz)2W(CO)4 units through hydrogen bonds to form linkage coordination polymers, in which two coordination modes are observed.
    Journal of Organometallic Chemistry 01/2002; 642(s 1–2):179–185. · 2.00 Impact Factor
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    ABSTRACT: The reaction between bis(dibromophenylstannyl)methane, [CH2(SnPhBr2)2], with bis(pyrazol-1-yl)alkanes, [(CH2)nPz2] (n=1 or 2; Pz=substituted pyrazole) in a 1:1 or 1:2 ratio yields only 1:1 adducts of PhBr2[(CH2)nPz2]SnCH2SnPhBr2, which have been confirmed by elemental analysis, 1H NMR and IR spectroscopy. The electronic and steric characteristics of substituents on the pyrazole rings markedly influence the donating ability of bis(pyrazol-1-yl)alkanes to the bidentate organotin Lewis acid acceptor. The investigations on the reaction of the adducts with DMSO and NMR spectra of the adducts show the weak interactions between ligands and the bidentate organotin Lewis acid acceptor. X-Ray analysis of PhBr2(CH2(4-ClPz)2)SnCH2SnPhBr2 showed that bis(4-chloropyrazol-1-yl)methane acts as a chelating bidentate ligand to only one tin atom.
    Polyhedron 01/2002; 21(8):873-878. · 2.05 Impact Factor