Obukh A. Copper(II) coordination compounds with binucleating ligands based on nitrogen derivatives of the saturated dicarboxylic acids

The copper(II) complexes with acyldihydrazones and diacyldihydrazines of the saturated dicarboxylic acids having the composition of [CunL·mPy] have been investigated. The results have been reported in 12 publications. The 30 new coordination compounds of copper(II) were synthesized. The investigation of spin-spin exchange interactions between paramagnetic centers via chain of sigma-bands was carried out by the EPR spectroscopy methods. The structures of 4 compounds were investigated by X-Ray analysis methods. This was found a weak long-range exchange interaction between paramagnetic centers in the binuclear complex of 5-hydroxy-3-methyl-1-phenyl-4-phormylpyrasole and succinic acid acyldihydrazone as well as in the spacer-armed dimmers of the pyruvic acid and saturated acids (from malonic to adipinic) hydrazide. The registration of the seven lines signal of the HFS in the EPR spectra that is caused by single electrons interactions with two equivalent copper(II) nuclei is the brightest manifestation of this phenomenon. This was found by X-Ray analysis method that coordination of three copper(II) cations in the saturated acids and salicylic acid diacyldihydrazines complexes leads to forced formation of the chelate rings that consist of from 5 to 10 atoms.