Structure and EPR spectra of binuclear copper(II) complexes with acyldihydrazones of benzenedicarboxylic acids and 5-substituted 2-hydroxyacetophenones

Magnetic properties of spacer-armed dinuclear copper(II) complexes

“…The copper(II) complex with isophthalic acylhy drazone and 2 hydroxy 5 methylacetophenone (complex V) is dinuclear and contains two structural nonequivalent copper atoms positioned at a distance of 8.56 Å from each other [4]. The Cu(1) atom addi tionally coordinates the phenoxide oxygen atom of a neighboring complex (the Cu(1)-O(1a) bond length is 2.699 Å).…”

“…As the metal…metal distance increases, exchange channels organized due to inter molecular interactions frequently come into play [11]. The structural features of the compounds under con sideration [1,4] allow us to study the effect of inter molecular interactions on the magnetic properties of spacer armed copper(II) dimers. Earlier X ray structural studies of complex I dis covered that copper atoms whose coordination poly hedra are linked by a methylene spacer are positioned at a distance of 6.94 Å from each other.…”

“…Dinuclear copper complexes with their aromatic analogues are studied little worse [3,4]. A specific feature of this type of complex is the existence of weak exchange coupling between paramagnetic centers; the brightest manifes tation of this coupling is the hyperfine structure com prised of seven lines from two equivalent copper nuclei found in the EPR spectra of liquid solutions.…”