Abstract

Reaction of copper perchlorate with sodium nitrite and pyrazine in methanol gives rise to the compound [Cu2(pyrazine)3(CH3O)2](ClO4)2
(1). This complex has been characterized through IR, combustion analysis, single crystal X-ray diffraction, and temperature dependent magnetic susceptibility measurements. Compound 1 crystallizes in the triclinic space group P-1 with the copper coordination geometry being
nearly square pyramidal. The Cu(II) ions are bridged by the methoxide ions to form a dimeric structure. Compound 1 exhibits an extended
3-D network with pyrazine rings forming sheets of the copper dimers, and bridging those sheets to form a distorted honeycomb. Magnetic
susceptibility measurements show a strong antiferromagnetic exchange within the methoxy-bridged copper dimers with 2J ~ –880 K

Key words: Pyrazine, Copper(II), Synthesis, X-ray Structure, Magnetism.