Optical Absorption and Electron Spin Resonance Spectral Studies of Copper(II) Chalcone Complexes in different Solvents

Department of Chemistry, School of Mathematical and Physical Sciences, Sri Venkateswara University, Tirupati-517 502 Manuscript received 28 January 1985, revised 24 April 1986, accepted 8 May 1986 Optical absorption and electron spin resonance spectral studies on copper(II) complexes of 2'-hydroxy-, 2',2-dihydroxy-, 2'-hydroxy-4-methoxy- and 2'-hydroxy-4- chlorochalcones in chloroform, dioxan, dimethyl formamide and pyridine indicate axial interaction of all these solvents with copper(II), and such interaction is greatest with pyridine. Monomeric nature of all the complexes in these solvents is indicated from magnetic moment data