Abstract
Abstract Assignments are given for the infrared spectra of bis-pyridine complexes of SnX4, (CH3)2SnX2(X=Cl,Br and I), and (C2H5)2SnCl2 in the 80–1610 cm−1 region. These complexes show the Sn–N stretching band near 200 cm−1. Most pyridine vibrations shift to a higher or a lower frequency upon complex formation. Among these, the ν10, in-plane ring deformation vibration is the most sensitive to the substituents on the tin atom as well as to the complex formation. Thus, the frequency may be a qualitative measure of the tin-pyridine coordination bond strength. The infrared spectra suggest a cis-configuration for the tin tetrahalide complexes and a distorted octahedral configuration for the dimethyltin diiodide complex. The remaining complexes may be assumed to have trans-alkyl and cis-halogen configurations.
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