SPECTRAL AND MAGNETIC PROPERTIES OF COPPER(2) CYANOACETATE

The preparation of copper(II) cyanoacetate is described and the spectral and magnetic properties are compared with those of dimeric copper(II) acetate monohydrate. The available evidence supports a dimeric structure and suggests polymerization of dimer units via the nitrogen end of the cyano group. The esr spectrum of the powdered solid is consistent with spin 5=1. The exchange interaction parameter J is estimated to be 310 cm−1, the zero field splitting parameters are D = 0.39 ± 0.01 cm−1 and E = 0.002 cm−1. The g values are gz = 2.40 ± 0.02 and g⊥ = 2.08 ± 0.02. A general method for ob¬taining the magnetic parameters of dimeric copper compounds from esr powder spectra is presented. The visible, infrared, and far-infrared spectra of copper(II) acetate monohydrate and cyanoacetate are also discussed. © 1968, American Chemical Society. All rights reserved.