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1 Polish Journal of Chemistry

1 2005

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Preparation, Spectroscopy and Magnetism of Di-mi-methoxy bis[copper(II)(benzo[d]pyridazine-1(2H)-one)2]2+ with NO- 3 or CIO- 4 as the Counter-ion

100%

Sadeghy N. , Amani S.

2005

tom Vol. 79 / nr 11

1749-1755

The synthesis, spectrocopic and magnetic characterization of two new methoxo-bridged copper(II) complexes are described. Both compounds have the general formula [Cu(m-OCH3)(L)2]2X2, in which X = NO3 or ClO4 and L = benzo[d]pyridazine- 1(2H)- one (abbreviated L). The title compounds all consist of dinuclear units with methoxo-bridging group. Both complexes have been synthesized in one-step reaction, and characterized by elemental analysis, FTIR and electronic spectra and by magnetic properties. The compounds exhibit antiferromagnetic interaction at room temperature. The absorption bands, attributed to d-d transition of copper(II) ion, ligandŽmetal charge transition and pŽp* or nŽp* transitions of ligand. The IR spectra ind cate Cu2O2 ringvibrations in 540-440 cm-1 range. The magnetic properties of the [Cu2(OCH3)2(L)4](NO3)2 has been in vestigated in the 6-268 K range and a singlet-trilet energy gap of -145 cm-1 was observed.