SINGLET-TRIPLET EQUILIBRIUM EFFECTS ON THE VIBRATIONAL SPECTRUM OF COPPER (II) ACETATE DIHYDRATE

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Date

1978

Authors

Mathey, Yves
Shriver, D. F.

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Ohio State University

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Abstract

The Raman spectrum of the title complex has been studied as a function of temperature $(100-300^{\circ}\, K)$ and compared with that of other related binuclear complexes where the axial ligand is dioxane, pyridine or pyrazine. The assignment of the Cu-0 stretching mode is based on IR and Raman studies of the isotopically $(D_{2}O, H_{2}O^{18}, CD_{3}COO^{-})$ substituted complexes. Enhancement of $\nu(Cu-O)$ in the Raman spectrum as the exciting line approaches the UV is observed. On decreasing the temperature, several changes in frequency and intensity are observed in the meta1-1igand stretching region, which are interpreted in terms of the equilibrium between the singlet and the triplet states of the binuclear complex. The difference in the vibrational partition function between the two spin states is considered and the resulting correction of Van Vleck’s susceptibility equation is evaluated.

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Author Institution: Department of Chemistry, Northwestern University

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