CRYSTAL-STRUCTURES AND SPECTROSCOPIC INVESTIGATIONS OF TERNARY CU-II-COMPLEXES WITH BICYCLIC DICARBOXYLIC-ACIDS AND N,N-DONOR LIGANS

The synthesis of coordination compounds [CuLdam] . 3H2O (H2L = 7-Oxa-bicyclo[2.2.1]heptane-2-exo,3-cis-dicarboxylic acid (1) and its 1-methyl-derivative (2); dam = Ethylendiamine, 1,2- and 1,3-propylendiamine, 2,2'-dipyridyl, 1,10-phenanthroline) has been described. Results of visible and IR spectroscopy and magnetic data are given. In the result of X-ray analyses of [CuL1dipy] . 3H2O (1d) and [CuL2en] . 3H2O (2a) the dicarboxylate anions of 1 and 2 proved to be tridentate chelating ligands. In ld the Cu atom has an approximately square-pyramidal coordination with the bridging O atom in the apical position. In 2a, however, the coordination number is extended to six by an O atom of a second [CuL2en] unit resulting in a centrosymmetric complex dimer with octahedrally coordinated Cu atoms. The water molecules do not participate in the coordination of the Cu atoms and form a complicated system of hydrogen bonds in the crystal.