Spacered dinuclear copper(II) complexes with acyldihydrazones of aliphatic dicarboxylic acids and 2-hydroxy-5-nitroacetophenone View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2007-02

AUTHORS

V. F. Shul’gin, A. N. Gusev, A. N. Chernega, G. M. Larin

ABSTRACT

Dinuclear copper(II) complexes with acyldihydrazones of 2-hydroxy-5-nitroacetophenone (H4L) of the composition Cu2(Py)xL·mEtOH were synthesized and characterized. In these complexes, the coordination polyhedra of the copper atoms are linked to each other by a polymethylene chain of different lengths, from one to five monomer units. The structure of the [Cu2L·4Mrf] complex (Mrf is morpholine) based on acyldihydrazone of malonic acid was established by X-ray diffraction. The copper(II) atoms in this complex are [4+1]-coordinated and are spaced by 6.94 Å. At room temperature, the signal in the ESR spectra of solutions of the complexes based on acyldihydrazones of malonic, succinic, glutaric, and adipic acids has a seven-line hyperfine structure with the constant of (35.3–38.8)·10−4 cm−1 (g = 2.109–2.112) due to exchange interactions between unpaired electrons and two equivalent copper nuclei. An increase in the length of the polymethylene chain to five monomer units hinders exchange interactions, and the ESR signal of the complex based on acyldihydrazone of pimelic acid has a four-line hyperfine structure with aCu = 72.7·10−4 cm−1 typical of mononuclear copper(II) complexes. More... »

PAGES

236-241

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11172-007-0039-7

DOI

http://dx.doi.org/10.1007/s11172-007-0039-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1023990987


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