σ- and π-Bonding capabilities of , , and in molybdenum hexacarbonyl derivatives

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Abstract
Cis- and trans-[Formula: see text] and cis- and trans-[Formula: see text] have been prepared. The dipole moments of Mo(CO)5L, cis-Mo(CO)4L2, and cis-Mo(CO)3L3[Formula: see text] as well as those of cis- and trans-[Formula: see text] have been measured.As the infrared data for stretching as well as deformation vibrations do not clearly explain the differences in stability, ease of substitution, or dipole moments with the different ligands, we have used the model of variable donor–acceptor ability of ligands combined with the model of non-retention of charges on the metal to show the importance of steric hindrance in substituted metal carbonyls. It is also possible to differentiate the σ and π bonding capabilities of the ligands [Formula: see text], [Formula: see text], [Formula: see text]. It is shown that [Formula: see text] is a better donor or acceptor than [Formula: see text] or [Formula: see text].

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