Complexes of dithiobenzoic acid (cas 121-68-6)s. V. Observations on the nature of the molybdenum--Sulfur bond in tetrakis(dithiobenzoato)molybdenum(IV) complexes

Add time:09/04/2019    Source:sciencedirect.com

Interpretations of data from infrared, visible-ultraviolet, and 13C NMR spectra lead to the conclusion that there is extensive covalent bonding in dithiocarboxylates, 4, of eight-coordinated molybdenum(IV), [Mo(4)4], and suggest the presence of metal-to-ligand π backbonding, in contrast to the bonding in analogous dithiocarbamate complexes. Some dd bands have been observed in the latter compounds, but in the dithiocarboxylates the d-d transitions are buried beneath intense low energy charge transfer bands, implying very efficient mixing of metal and ligand orbitals. The first CT band (at least) is most likely metal(xy)-to-ligand(π*).

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