Electron Spin Resonance in Anhydrous Copper Nitrate

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Abstract
The electron spin resonance spectra of solutions of anhydrous copper nitrate in ethyl acetate, methyl cyanide, nitromethane, and dioxan have been measured at 9.2 kMc/sec and 77°K. In ethyl acetate, the hyperfine structure was sufficiently resolved to permit analysis in terms of a Hamiltonian representing tetragonal symmetry. The data were g∥=2.34, g⊥=2.07, A=0.0121 cm—1, B=0.0040 cm—1. Almost pure σ‐bonding between the copper ion and the solvent ligands is indicated. No hfs was visible in other frozen solutions. For nitromethane gpeak=2.15 and evidence is presented to suggest that the copper complex in this case is nearly cubic.

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