STRUCTURE OF 6-MEMBERED AND 7-MEMBERED CYCLIC-BETA-DIKETONES AND THEIR METAL(II) COMPLEXES

Two new copper(II) complexes with physiologically active ligands conta ining both pyridine ring and cyclic P-diketones with different ring me mbers were obtained with the metal to ligand ratio 1:2. The structure and coordination mode of both complexes were studied using IR and EPR methods. The AM1 method was applied for calculating the structure of 5 ,7-dioxo-6-(2-pyridyl)-6,7-dihydro-5H-dibenzo (a,c)cycloheptene and it s Zn-II complex. It is shown that the structure of both complexes is a tetragonal one and the coordination is realized via the hydroxy O and N of the pyridine ring. (C) 1997 Elsevier Science Ltd.