DIMERIC COPPER(II) COMPLEXES WITH BRIDGING UNSATURATED CARBOXYLIC LIGANDS. CORRELATION OF pKa VALUES AND MAGNETIC EXCHANGE PARAMETERS
- 1 September 1984
- journal article
- research article
- Published by Taylor & Francis in Journal of Coordination Chemistry
- Vol. 13 (4) , 291-298
- https://doi.org/10.1080/00958978408073881
Abstract
The copper(II) salts∗ of acrylate, crotonate and 3,3′-dimethyl-acrylate anions exist with reduced magnetic moments. Magnetic susceptibility measurements (80–300 K) revealed the strong antiferromagnetic exchange coupling between the copper(II) ions. Singlet-triplet separation values obtained by least-squares fitting to the modified Bleaney-Bowers equation are equal to −302, −305 and −324 cm−1, respectively. Unusual EPR spectra of these compounds, which, besides lines due to dimeric units, also exhibit the lines characteristic for polymeric copper(II) chains (g ≈2.10) are the basis for discussion of the molecular structures of the compounds.Keywords
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