Shahid N. Shaikh

Silver(I) clusters of the sterically-hindered bidentate ligand, 3-(dimethylphenyl)silyl-2-pyridinethiol. The crystal and molecular structures of [Ag(SC5H3N-3-SiMe2,Ph)]6 and [Ag8(SC5H3N-3-SiMe2Ph)6][Ag(NO3)2]2·2CH3OH·CH2Cl2

Abstract The reaction of Ag(NO3) with excess HSC5H3N-3-SiMe2Ph yields the hexanuclear [Ag6(SC5H3N-3-SiMe2Ph)6], a species exhibiting a molecular “paddlewheel” structure with a central Ag6S6 drum. In contrast, the reaction of excess Ag(NO3) with HSC5H3N-3-SiMe2Ph under otherwise identical conditions produces [Ag8(SC5H3N-3-SiMe2Ph)6][Ag(NO3)2]2·2CH3OH·CH2Cl2. The eight silver centres of the [Ag8(SR)6]2+ central core exhibit hexagonal bipyramidal geometry, with the two silver ions of the [Ag(NO3)2]− units associated as two weakly interacting appendages. Crystal data [Ag6(SC5H3N-3-SiMe2Ph)6]: orthorhombic Pbca, a = 17.576(3), b = 18.634(3), c = 25.845(6) A, V = 8464.4(11) A3, Z = 4, Dcalc, = 1.66 g cm−3; structure solution and refinement based on 2945 reflections (Mo-Kα, λ = 0.71073 A) converged at R = 0.0420. [Ag8(SC5H3N-3-SiMe2Ph)6][Ag(NO3)2]2: triclinic P 1 , a = 13.103(3), b = 14.766(3), c = 15.600(3) A, α = 63.88(1), β = 80.27(2), γ = 72.35(1)°, V = 2580.5(9) A3, Z = 1, Dcalc = 1.95 g cm−3; 5251 reflections, R = 0.0392.

Synthesis and structural characterisation of an unusual tetranuclear oxomolybdenum(VI) complex of dihydroxybenzoquinone, [Mo4O10(O4C6H2)2]2–, and a comparison with the mononuclear chloranilate complex [MoO2(HO4C6Cl2)(O4C6Cl2)]1–

While reaction of the sterically encumbered chloranil group with (Mo2O7)2– yields the mononuclear species [MoO2(L)(LH)]1–(L = C6O4Cl2), dihydroxylbenzoquinone under similar conditions yields the tetranuclear cluster [(Mo2O5)2(C6H2O4)]2–, a species with magnetically coupled semiquinone ligands.

Chemistry of polydentate thiolate-amine complexes of molybdenum with organosubstituted hydrazines. Synthesis and structural characterization of the six-coordinate Bis-phenyldiazenido Complex, [Mo(N2C6H5)2{(SCH2CH2)2NCH2CH2-N(CH3)2}], and of the Five-coordinate Hydrazido(2—) complex, [MoO(NNMePh){(SCH2CH2)2NCH2-CH2N(CH3)2}]

[Mo(NNPh) 2 L] cristallise dans le systeme orthorhombique, groupe despace P2 1 2 1 2 1 et sa structure est affinee jusqua R=0,063. [MoO(NNPh) 2 L] cristallise dans le systeme monoclinique, groupe despace P2 1/c avec R=0,053

Synthesis and structural characterization of a binuclear molybdenum-hydrazido(2-) complex, [Mo2O4(NNPh2) {(CH3)2NCH2CH2NHCH2CH2S}2]

Le compose du titre cristallise dans le systeme monoclinique, groupe despace P2 1 /a et sa structure est affinee jusqua R=0,032