Spacer-armed copper(ii) complexes with benzenecarboxylic acids and trifluoroacetylacetone aroylhydrazonesCCDC 945251 and 945252. For crystallographic data in CIF or other electronic format see DOI: 10.1039/c3dt52483c

• Main Authors: Shul'gin, Victor F, Konnik, Oleg V, Gusev, Alexey N, Bo a, Roman, Dlhá, Lubor, Rusanov, Eduard B, Alexandrov, Grygory G, Eremenko, Igor L, Linert, Wolfgang
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c3dt52483c

New bi- and trinuclear copper( ii ) complexes of aroylhydrazones of TFA and benzenecarboxylic acids were synthesized and characterized. Despite long range intramolecular Cu Cu distances of about 10 Å, exchange couplings between paramagnetic centres are observed with J values of 0.33 and 0.37 cm −1 in binuclear complexes, and −0.33 cm −1 in trinuclear complexes. Seven hyperfine peaks with a value of a Cu = 37.0 × 10 −4 cm −1 are observed in EPR spectra of binuclear complexes. The possible mechanisms responsible for the observed weak long range coupling via aromatic spacers are discussed. Structural diversity, EPR and magnetic properties of three bi- and trinuclear Cu( ii ) complexes based on aroylhydrazones were investigated.