Abstract
The complex [Cu(trien)SCN]SCN is studied by ESR in water—ethanol mixtures. The changes in the symmetry of the complex unit are found to depend on the ethanol concentration in solution. From the ESR spectra the g and A values are determined. Using these values, the MO coefficients are found in a rhombic symmetry approximation ( D 2h ) where d xy is the highest occupied d -orbital. On varying the ethanol concentration in solution a variation of the covalency degree of in-plane (β 2 ) and out-of-plane (δ 2 ) π-bonds was observed. This variation is attributed to water molecules being differently coordinated on Oz axis and to the structuring effect of the matrix.
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