The infrared spectra of diethylcadmium(CdEt2) in a variety of different solvents were measured. The affinity of CdEt2 toward oxygen and sulfur bases was studied by infrared frequency shifts of CdEt2. Linear relationships were observed for the plots of the two frequency shifts Δνa(C–Cd–C) of CdEt2 vs. Δνa(C–Zn–C) of ZnEt2 and Δνa(C–Cd–C) vs. Δν(O–D) of CH3OD. The deviation of the plots for the systems of CdEt2 with cyclic sulfides from the linear behavior was interpreted in terms of dative back-bonding from CdEt2 to sulfides. The enhanced reactivity of the Cd–S compound toward propylene oxide compared to that of the Cd–O compound was considered to result from a harder acid character of the Cd atom in the Cd–S compound caused by its back-bonding nature.
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Nakasugi et al. (1974) studied this question.
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