Molybdenum complexes structure

Comparison of the photoelectron spectra and electronic structures of M-NS and M-NO complexes, e.g., [CpCr(CO)2(NX)] (X = S, O), indicates that NS is a better a-donor and a stronger r-acceptor ligand than NO. This conclusion is supported by " N and Mo NMR data, and by the UV-visible spectra of molybdenum complexes. 

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The occurrence of structure changes as a result of electron transfer steps is well-documented [14-16]. Such a reaction has been observed for a molybdenum complex of the macrocyclic tetrathioether Meg[16]aneS4 (Meg[16]aneS4 = 3,3,7,7,11, 11,15,15-octamethyl-l,5,9,13-tetrathiacycl-ohexadecane) [17-20], which is among the... 

Tungsten hexacarbonyl on treatment with bicyclo-[4,3,0Jnona-2,4,8-triene(C9Hio) gives a brick red complex [W(CO)3(C9Hi0)J which appears to be completely analogous to the molybdenum complex [Mo(CO).i(CaH,t))] of structure (VIII) (142). 

Several complexes containing the W2S3 and W203 structural units have been prepared with thioxanthates and dithiocarbamates.178,179,180 Whether these have structures similar to the analogous molybdenum complexes is yet to be determined. 

Transition metal complexes of unsaturated 1,2-dithiolates (metal dithiolenes) have attracted much attention because of their interesting structural and redox properties.169 Molybdenum dithiolene complexes have featured prominently170 in these studies and have special significance following the suggestion171,172 that the molybdenum-containing cofactor of the oxomolybdoen-zymes (Section 36.6.7) incorporates a molybdenum complex of an unsymmetrically substituted alkene-1,2-dithiolate. 

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