Nature of the coordination bond in metal complexes of substituted pyridine derivatives. IV. Skeletal vibration spectra and the substituent effect upon the coordination bond of the pyridine complex of zinc(II) ion

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Abstract
Far infrared spectra of the complexes Zn(pyridine)2X2, where X = Cl or Br, have been investigated in the region 350–20 cm−1. Eight infrared-active skeletal modes of these complexes have been observed, and a tentative assignment of these absorption bands has been made. The previous investigation of the effect of substituents upon the coordination bond of the copper–pyridine complex has been extended to the zinc–pyridine complex in the present paper. It was found that the relative zinc–pyridine bond strength, affected by the substituents, is determined by both the relative σ-contribution and π-contribution to the bond, rather than mainly by the σ-contribution as in the system of copper complexes. The force constants associated with the zinc–pyridine coordination bond of a series of 4-substituted pyridine complexes have been calculated by a normal coordinate treatment described in previous papers in this series.

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