Synthese,Kristallstrukturen und spektroskopische Untersuchungen von 3d-Übergangsmetall-Komplexen mit Bicyclo[2.2.1]hept-5-en-2-endo,3-cis-dicarbonsäure und N,N-Donorliganden

Synthesis, Crystal Structures and Spectroscopic Investigations of 3d-Transition Metal Complexes with Bicyclo2.2.1]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⁺; H₂L = bicyclo2.2.1]hept-5-ene-2-endo,3-cis-dicarboxylic acid and dam = 2,2′-dipyridyl, 1,10-phenanthroline has been described. The complexes have been characterized by elementary analysis, infrared and electronic spectra and magnetic susceptibility measurements. The results of X-ray crystal structure analyses 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 carboxylate 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, thus stabilizing the crystal packing.