Abstract
Visible, infrared and Mössbauer spectra of 4-substituted pyridine N-oxide complexes of the formula [Fe(4-ZC 5H 4NO) 6](ClO 4) 2, where Z = OCH 3, CH 3, H, Cl and NO 2 are reported. Spectral data indicate that the six coordinated complexes are of high-spin octahedral structure distorted from O h symmetry. From infrared spectral measurements metal-oxygen stretching vibrations are found to be correlated with the σ pyNO values of the ligand. Crystal field parameters are evaluated from diffuse reflectance spectra and the trend of parameter was discussed in terms of spectrochemical series.
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