Abstract
The 95Mo NMR chemical shifts are reported for two series of solvent adducts of the dimeric molybdenum(II) complexes Mo 2(O 2CR) 4L 2 (R = CF 3, Bu t ; L - solvent). The large deshielding effect (over 450 ppm for the R = CF 3 series as the solvent changes from chloroform to hexamethylphosphoramide) correlates well with the donor number of the solvent. The lowest energy electronic absorption band corresponding to the δ− δ * transition also moves to longer wavelength with the more strongly coordinating solvents, which is consistent with weakening of the MoMo quadruple bond and the dominance of the ΔE parameter in the paramagnetic term which controls the magnitude of δ( 95Mo).
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