Preparation, spectra, and fluxional behaviour of cyclopentadienylcobalt(III) complexes with dithiocarbamate and xanthate ligands. The crystal structure of [Co(η-C5H5)(I)(S2CNEt2)]

摘要: Abstract The reactions of [Co(η-C 5 H )(CO) 2 ] with thiuram disulphides, [(R NCS ) ], give )(S CNR but it is better to use )(I)(η -S )] (I), COR)](II), and their C 4 Me analogues, as precursors for )(η 1 (III), CNR′ (η )l (IV), COR)(η (V), COR′)] (VI) (R,R′ = or Et). IR NMR spectra I-VI are reported assigned. They consistent structures that have pseudo-octahedral coordination about Co planar CO(η -S∼S) moieties where S∼S dithiocarbamate xanthate ligands. various fluxional processes undergone by these complexes been investigated dynamic spectroscopy. There rotation CNEt in η CNEt ligands C-NR -dithiocarbamate which can be slowed at low temperatures I, III, IV V, COEt always fast COEt II VI. Both III undergo -η ligand exchange V VI do not. In solution exists a mixture the two possible isomers [CO(η-C CNMe favoured higher temperatures. An X-ray diffraction study confirms structure its diethyldithiocarbamate ligand.