1. Syntheses and characterization of cubane-type clusters, [Mo4S4(edta)2]n− (n=2–4), [Mo4S4(H2O)12]n+ (n=4–6) and [Mo4S4(NH3)12]4+. X-ray structures of Na2[Mo4S4(edta)2]·6H2O, Ca1.5[Mo4S4(edta)2]·13H2O, Mg2[Mo4S4(edta)2]·2OH2O, [MO4S4(H2O)12](CH3C6H4SO3)5·14H2O and [MO4S4(NH3)12]Cl4·7H2O
- Author
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Kuroya Hisao, Akashi Haruo, Shibahara Takashi, Matsumoto Keiji, and Ooi Shun'ichiro
- Subjects
chemistry.chemical_classification ,Stereochemistry ,Carboxylic acid ,Crystal structure ,Triclinic crystal system ,Inorganic Chemistry ,Crystallography ,chemistry.chemical_compound ,chemistry ,Cubane ,Diamine ,X-ray crystallography ,Materials Chemistry ,Physical and Theoretical Chemistry ,Hydrate ,Monoclinic crystal system - Abstract
Sulfur-bridged cubane-type molybdenum clusters, [Mo4S4(edta)2]3− (1B), [Mo4S4(H2O)12]5+ (2B) and [Mo4S4(NH3)12]4+ (4C), are obtained from [Mo2O2S2(edta)]2− and NaBH4, from Mo2O2S22+(aq) and NaBH4, and from 2B and ammonia-water, respectively. The reduced and oxidized forms of 1B, [Mo4S4(edta)2]n− (n=4 (1C) and 2 (1A)), and those of 2B, [Mo4S4(H2O)12]n+ (n=4 (2C) and 6 (2A)), are isolated and characterized. The clusters 1B and 2B show two quasi-reversible, one-electron waves. The crystallographic results obtained are as follows: Na2[Mo4S4(edta)2]·6H2O (Na1A), monoclinic, P21/n, a=25.171(4), b=11.231(3), c=13.417(3) A, β=98.28(1)°, V=3753.4(15) A3, Z=4, R=4.41%; Ca1.5[Mo4S4(edta)2]·13H2O (Ca1B), monoclinic, P21/c, a=15.726(8), b=12.447(4), c=28.10(2) A, β=123.16(3)°, V=4604.6(43) A3, Z=4, R=5.53%; Mg2[Mo4S4(edta)2]·2OH2O (Mg1C), monoclinic, P21/m, a=14.358(6), b=13.680(6), c=12.990(5) A, β=96.56(2)·, V= 2534.8(19) A3, Z=2, R=4.79%; [Mo4S4(H2O)12](CH3C6H4SO3)5· 14H2O (2Bpts) (Hpts=paratoluenesulfonic acid), triclinic, P 1 , a=16.352(4), b=16.715(3), c=13.109(4) A, α=91.05(2), β=98.73(2), γ=89.37(2)°, V=3540.8(16) A3, Z=2, R=4.06%; [Mo4S4(NH3),12]Cl4·7H2O (4C′), triclinic P 1 , a=10.529(3), b=17.470(4), c=9.967(3) A, α=96.74(2), β=116.26(2), γ=82.91(2)° , V=1627.4(8) A3, Z=2, R=4.50%. The electronic structures of 2A, 2B and 2C were investigated using the spin-polarized discrete variational (DV)-Xα method. The binding energies (eV) of Mo3d3/2 and Mo3d5/2 obtained by XPS measurements are: Na1A, 232.7, 229.7; Na3[Mo4S4(edta)2]· 1OH2O (Na1B), 232.1, 229.0; Mg1C, 232.1, 229.0; 2Bpts, 233.0, 230.0; 4C′, 232.1, 228.9.
- Published
- 1993
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