STUDIES OF METAL COMPLEXES OF PYRIDINE DERIVATIVES: THE EFFECTS OF COORDINATION UPON INFRARED INTENSITY OF THE FUNCTIONAL GROUP IN β-CYANOPYRIDINE

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Abstract
The infrared intensity of the C≡N group in β-cyanopyridine complexes with some first-row transition metal ions (Zn(II), Cu(II), Ni(II), Co(II), Fe(II), and Mn(II)) in aqueous solution has been measured. The coordination between the nitrogen atom on the pyridine ring and these metal ions exerts a marked change in the magnitude of the band intensity of the functional group. This can be interpreted in terms of a simple molecular orbital model and the relative magnitudes of σ-bonding and π-bonding involved in the complexes. A "coordination constant" is introduced for this system, and a linear correlation between these constants and the C≡N band intensities of the metal complexes is obtained from both the experimental data and theoretical considerations.

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