Publication in New Journal of Chemistry

Three croconato-bridged Cu(II) complexes were synthesized and structurally characterized including dinuclear [Cu2(Et4dien)21,2,3,4-C5O5)](ClO4)2·3H2O (1) and [Cu2(pmap)21,2,3,4-C5O5)](ClO4)2·2H2O (2) and the 1D coordination polymer {[Cu(dmpzp)(μ1,2,3,4-C5O5)]·H2O}n (3), where Et4dien = N,N′,N′′,N′′-tetraethylethylenetriamine, pmap = bis(2-(2-pyridyl)ethyl)-(2-pyridylmethyl)amine and dmpzp = 1-(2-methylpyridyl)-3,5-dimethyl-1-H-pyrazole. The synthesized complexes were further characterized by a single crystal X-ray analysis which revealed the bis-bidentate chelating nature of the μ1,2,3,4-croconato ligand with the intra-dimer Cu⋯Cu bond distances ranging from 6.79 to 7.69 Å across the bridged croconate. The magnetic susceptibility measurements at varying temperatures (1.9–300 K) showed that the complexes exhibit a weak antiferromagnetic (AF) coupling with J values = −2.67 cm−1 for 1 and 2, and −4.05 cm−1 for 3. The weak AF coupling was also predicted based on the DFT calculations. The magnetic properties of the complexes are discussed in light of their structures and compared with the previously reported croconato-bridged Cu(II) complexes.

 

Date: 3. apr 2017 | Author: agch

Department of Inorganic Chemistry

Faculty of Science
Palacký University in Olomouc

17. listopadu 12
CZ-771 46 Olomouc
Czech Republic

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email : agch(at)upol.cz