Synthesis and characteristics of sulfur interligand bridge-derivatives and of some S-substituted compounds in the (C2B9H11)2Co- series. Conformations of (C2B9H11)2Mx- metallocarboranes

Abstract

Synthesis, properties and chemical behaviour of the (C2B9H11)2Co- derivatives, namely anions with -S- or -SS- bridges and of neutral species with -SR- (R = H, alkyl, aryl) or -S-SR- bridges as well as with -(+)S(CH3)2 group are described. The analysis of 11B NMR spectra indicates in solution and in the 11B NMR time scale a free rotation at (C2B9H11)2Co-, oscillations at -S2-, -S=CH=S- and rigid conformations at -S- or -(+)SR-, (CH3)2S(+)- and -S-SR(+)- derivatives. For description of different conformations a combination of locants and descriptors e (eclipsed), s (staggered) is proposed. The (s-1,4',2,1') conformation was found by X-ray study of (8-CH3OC2B9H10)2Ni.