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  • 1
    ISSN: 0044-2313
    Keywords: Complex compounds ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 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 LigandsThe synthesis of coordination compounds of the general type [MLdam(H2O)3] · 2.5 H2O with M = Mn2+, Co2+, Ni2+; H2L = bicyclo[2.2.1]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.
    Notes: Die Synthese von Koordinationsverbindungen der allgemeinen Zusammensetzung [MLdam(H2O)3] · 2,5 H2O mit M = Mn2+, Co2+, Ni2+; H2L = Bicyclo[2.2.1]hept-5-en-2-endo,3-cis-dicarbonsäure und dam = 2,2′-Dipyridyl, 1,10-Phenanthrolin wird beschrieben. Die Komplexe werden durch quantitative Analysen, IR- und Elektronenspektren sowie Magnetmessungen charakterisiert.Die Ergebnisse der Röntgenkristallstrukturanalyse von [MnLdipy(H2O)3] · 2,5 H2O (1 a) und [CoLdipy(H2O)3] · 2,5 H2O (1 b) zeigen, daß beide Verbindungen isotyp kristallisieren und belegen die oktaedrische Koordination der Metallatome. Das Dicarboxylat-Anion ist mit nur einem O-Atom am Zentralatom gebunden, die zweite Carboxylatgruppe liegt ionisch vor. Je ein O-Atom jeder Carboxylatgruppe geht eine intramolekulare Wasserstoffbrückenbindung mit einem koordinativ gebundenem Wassermolekül ein. Die restlichen Kristallwassermoleküle bilden ein die Packung stabilisierendes Wasserstoffbrückennetz untereinander und mit den Komplexmolekülen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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