SYNTHESIS, CRYSTAL-STRUCTURES AND SPECTROSCOPIC INVESTIGATIONS OF 3D-TRANSITION METAL-COMPLEXES WITH BICYCLO[2.2.1]HEPT-5-ENE-2-ENDO,3-CIS-DICARBOXYLIC ACID AND N,N-DONOR LIGANDS

The synthesis of coordination compounds of the general type [MLdam(H2O )3] . 2.5 H2O with M = Mn2+, Co2+ , Ni2+; H-2L = bicyclo[2.2.1]hept-5- ene-2-endo,3-cis-dicarboxylic acid and dam = 2,2'-dipyridyl, 1,10-phen anthroline has been described. The complexes have been characterized b y elementary analysis, infrared and electronic spectra and magnetic su sceptibility measurements. The results of X-ray crystal structure anal yses of [MnLdipy(H2O)3] . 2.5 H2O (1 a) and [CoLdipy(H2O)3]. 2,5 H2O ( 1 b) show, that both compounds crystallize isotypically and prove the octahedral coordination of the metal atoms. The dicarboxylate anion is coordinated to the central atom by an O atom of only one carboxylate group, the other one is in the ionic state. One O atom of each carboxy late group makes an intramolecular hydrogen bond with a water molecule of the coordination sphere. The other crystal water molecules form a network of H bonds one with another and with the complex molecules, th us stabilizing the crystal packing.