The trimeric diphenyltin chalcogenides (Ph2SnE)(3) (E = S (1), Se (2), Te(3)) have been synthesized by reaction of Ph2SnCl2 with Li2E and characterized by multinuclear NMR spectroscopy (H-1, C-13, Sn-119, Se-77 and Te-125) as well as crystal structure analyses. The three compounds crystallize in the monoclinic space group P2(1)/n and show central six-membered rings Sn3E3 in twisted boat conformations. For l density functional theory (DFT) calculations at the B3LYP/6-31G* level of theory have revealed the twisted boat conformation as the global minimum. Additionally a boat conformation (+ 3.4 kJ mol(-1)) and a chair conformation (+ 7.9 U mol(-1)) have been calculated. The mutual repulsion of the phenyl rings in the chair conformation is also evident from the increased bond angles of the Sn3S3 ring in l. (C) 2002 Published by Elsevier Science B.V.
Synthesis of Metallacycles by Oxidative Addition of Sn−S, Sn−Se, Sn−Te, and Ge−Te Containing Precursors to Platinum(II)
作者:Michael C. Janzen、Hilary A. Jenkins、Louis M. Rendina、Jagadese J. Vittal、Richard J. Puddephatt
DOI:10.1021/ic980862p
日期:1999.5.1
metallacycles complexes can undergo exchange of either the R(2)Sn or the E groups by reaction with [(R'(2)SnE)(3)] or [(R(2)SnE')(3)], respectively, to give the corresponding new metallacycles of general formula [PtMe(2)(R(2)SnE-R'(2)SnE)(bu(2)bpy)] or [PtMe(2)(R(2)SnE-R(2)SnE')(bu(2)bpy)]. The isostructural series of complexes [PtMe(2)(Ph(2)SnE)(2)(bu(2)bpy)] with E = S, Se, and Te have been characterized