Paper

Dalton Trans., 2004, 3822 – 3828, DOI: 10.1039/B411099D

Sulfur, tin and gold derivatives of 1-(2-pyridyl)-ortho-carborane, 1-R-2-X-1,2-C₂B₁₀H₁₀(R = 2-pyridyl, X = SH, SnMe₃ or AuPPh₃)

Andrei S. Batsanov, Mark A. Fox, Thomas G. Hibbert, Judith A. K. Howard, Raikko Kivekäs, Anna Laromaine, Reijo Sillanpää, Clara Viñas and Kenneth Wade

Reaction of the lithium salt of 1-(2-pyridyl)-ortho-carborane, Li[1-R-1,2-C₂B₁₀H₁₀](R = 2-NC₅H₄), with sulfur, followed by hydrolysis, gave the mercapto-o-carborane, 1-R-2-SH-1,2-C₂B₁₀H₁₀ which forms chiral crystals containing helical chains of molecules linked by intermolecular S–HN hydrogen bonds. The cage C(1)–C(2) and exo C(2)–S bond lengths (1.730(3) and 1.775(2), respectively) are indicative of exo SC bonding. The tin derivative 1-R-2-SnMe₃-1,2-C₂B₁₀H₁₀, prepared from Li[1-R-1,2-C₂B₁₀H₁₀] and Me₃SnCl, crystallises with no significant intermolecular interactions. The pyridyl group lies in the C(1)–C(2)–Sn plane, oriented to minimise the NSn distance (2.861(3)). The tin environment is distorted trigonal bipyramidal with axial N and Me. The gold derivative 1-R-2-AuPPh₃-1,2-C₂B₁₀H₁₀, prepared from Li[1-R-1,2-C₂B₁₀H₁₀] and AuCl(PPh₃), reveals no NAu interaction in its crystal structure.

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