摘要:
A series of cyanide-bridged binuclear complexes, ('S-3')Ni-CN-M[Tp(tBu)] ('S-3' = bis(2-mercaptophenyl) sulfide, Tp(tBu) = hydrotris(3-tert-butylpyrazolyl) borate, M = Fe (2-Fe), Co (2-Co), Ni (2-Ni), Zn (2-Zn)) was prepared by the coupling of K[('S-3')Ni(CN)] with [Tp(tBu)]MX. The isostructural series of complexes was structurally and spectroscopically characterized. A similar coupling strategy was used to synthesize the anionic copper(I) analogue, Et4N{('S-3')Ni-CN-Cu[Tp(tBu)]}, 2-Cu.An alternative synthesis was devised for the preparation of the linkage isomers of 2-Zn, i.e. of cyanide-bridged linkage isomers. X-ray diffraction, C-13 NMR and IR spectral studies established that isomerization to the more stable Ni-CN-Zn isomer occurs. DFT computational results buttressed the experimental observations indicating that the cyanide-bridged isomer is ca. 5 kcal/mol more stable than its linkage isomer. (C) 2009 Elsevier B. V. All rights reserved.