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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Media type:
E-Article
Title:
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
Contributor:
Wong, Patrick T. T.;
Brewer, D. G.
Published:
Canadian Science Publishing, 1969
Published in:
Canadian Journal of Chemistry, 47 (1969) 24, Seite 4589-4597
Language:
English
DOI:
10.1139/v69-759
ISSN:
0008-4042;
1480-3291
Origination:
Footnote:
Description:
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.