Abstract
Abstract Vanadyl complexes with Schiff bases of 2-hydroxy-1-naphthalidene and aryl amines were prepared. The ESR spectra of all the complexes were recorded at room temperature and at liquid nitrogen temperature (177 K), by the method of Kneubuhl, Sands and German. A small polycrystalline sample of the tetracyanoethylene (TCNE) free radical was used as a “ g ” marker. The spectra were again analysed by the method of Kneubuhl, Sands and Garman. The values xv g xv, g xV (parallel), g hu, (perpendicular), xv A xv, A xV, A hu were obtained. The expression hv = gβH was used for evaluating the “ g ” values. Due to rapid tumbling of the molecules in solution at room temperature the anisotropy is not observed, but it is clearly visible at 177 K. “ g ” is a function indicating covalency and therefore an order of covalency in the vanadyl complexes has been reported.
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