Magnetic and Optical Spectra of Two Dimeric Copper Chloride Pyridine-N-Oxide Complexes

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Abstract
The electron paramagnetic resonance spectra and the optical absorption spectra of dichlorobispyridine‐N‐oxide copper(II) [(C5H5NO)2CuCl3] and dichloromonoaquopyridine‐N‐oxide copper(II) [C5H5NOCuCl·H2O] have been observed at room temperature. The magnetic resonance studies were carried out at both X‐band and K‐band frequencies. The observed spectra could be fit to an S=1 spin Hamiltonian. The direction of the maximum zero‐field splitting did not correspond to the principal z axis of the g tensor. For (C5H5NO)2CuCl2 the angle between these two directions was about 23° and for C5H5NOCuCl·H2O the angle was about 27°. A study of the intensity of the EPR signal as a function of temperature indicated that the triplet state was about 550 cm−1 above the single ground state for (C5H5NO)2CuCl2 and about 885 cm−1 above the singlet state for the other complex. The optical spectra of both examples revealed two bands in the 8000‐to−15 000‐cm−1 region and a higher energy transition at about 22 000 cm−1.

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