thiosemicarbazone) was prepared Crystal structure anal. has shown that 2 Cu atoms are bridged by 2 O atoms. Each O atom lies at the base of a square pyramid containing 1 Cu atom and acts as the top of the square pyramid containing the other Cu atom. The crystal belongs to monoclinic system, space group Cc, with a 16.445, b 13.889, c 12.770 ? b 122.82? R = 0.0388, Rw = 0.0414. The band shifts of the N-O bond and the C:N bond in the IR spectrum were explained by semiempirical MO calcns. and the value of the magnetic coupling parameter was estimated

Key words: PYRIDINE P, INFRARED SPECTROPHOTOMETRY, CRYSTAL STRUCTURE, X-RAY DIFFRACTION ANALYSIS, COPPER COMPLEX, OXIDE, ELECTRONIC STRUCTURE, DINUCLEAR COMPLEX, FORMALDEHYDE P, THIOSEMICARBAZIDE P