SYNTHESIS, CRYSTAL-STRUCTURE AND PROPERTIES OF THE COPPER(II) COMPLEXOF A NEW DIOXOCYCLAM APPENDED WITH 2 8-METHYLQUINOLINES AS ADDITIONALDONOR PENDANTS YCLAM=1,4,8,11-TETRAAZACYCLOTETRADECANE-5,7-DIONE)

A macrocyclic dioxotetraamine ligand ethyl)-1,4,8,11-tetraazacyclotetr adecane-5,7-dione (H(2)L) has been newly synthesized and characterized . The resulting dioxocyclam readily coordinates Cu(II) with concomitan t double deprotonation of the ligand. The Cu(II) complex of H(2)L has been isolated as a single crystal and the structure determined by X-ra y diffraction analysis. CuL . CH3COOH, C32H36CuN6O4, crystallizes in t he triclinic crystal system P-1 space group with a = 11.162(2), b = 12 .246(3), c = 13.347(3) Angstrom, alpha = 67.76(2), beta = 65.36(2), ga mma = 67.70(2)degrees, Z = 2, R(R(2)) = 0.058 (0.063) for 2300 observe d reflections with I > 3 sigma (I). The solution behaviors of CuL (1) have been further studied with ESR and UV-Vis techniques. A remarkable red-shift was observed for the maxima absorption band of the electron ic spectra of Cut (1) in comparison to that of CuL(0) (H(2)L(0), dioxo cyclam = 1,4,8,11-tetraazacyclotetradecane-5,7-dione).