[Zurück]

G. Margraf, T. Kretz, F. Fabrizi de Biani, F. Laschi, S. Losi, P. Zanello, J. Bats, B. Wolf, K. Removic-Langer, M. Lang, A. Prokofiev, W. Assmus, H. Lerner, M. Wagner:
"Mono-, Di-, and Oligonuclear Complexes of Cu^II Ions and p-Hydroquinone Ligands: Syntheses, Electrochemical Properties, and Magnetic Behavior";
Inorganic Chemistry, 45 (2006), 3; S. 1277 - 1288.

Mono-, Di-, and Oligonuclear Complexes of Cu^II Ions and p-Hydroquinone Ligands: Syntheses, Electrochemical Properties, and Magnetic Behavior

Günter Margraf, Tonia Kretz, Fabrizia Fabrizi de Biani, Franco Laschi, Serena Losi, Piero Zanello,* Jan W. Bats, Bernd Wolf, Katarina Removi-Langer, Michael Lang, Andrei Prokofiev, Wolf Assmus, Hans-Wolfram Lerner, and Matthias Wagner*

Institut für Anorganische Chemie and Institut für Organische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany, Dipartimento di Chimica dell'Università, Via Aldo Moro, I-53100 Siena, Italy, and Physikalisches Institut, J.W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt (Main), Germany

Received June 22, 2005

Abstract:

Four highly soluble square-planar CuII and NiII complexes of siloxy-salens (2SiCu, 2SiNi) and hydroxy-salens (2Cu, 2Ni) have been synthesized. An X-ray crystal structure analysis was performed on 2SiCu, 2SiNi, and 2Ni. The compounds have been investigated by cyclic voltammetry, UV-vis-NIR spectroelectrochemistry, and EPR spectroscopy. According to these results, the monooxidized species [2SiCu]+ and [2SiNi]+ are to be classified as Robin-Day class II and III systems, respectively. Magnetic measurements on the dinuclear (PMDTA)CuII complex 1Cu2·(PF6)2 with deprotonated 1,4-dihydroxy-2,5-bis(pyrazol-1-yl)-benzene (1) linker revealed antiferromagnetic coupling between the two CuII ions thereby resulting in an isolated dimer compound. Coordination polymers [1Cu]n(H2O)2n of CuII ions and bridging p-hydroquinone linkers were obtained from CuSO4·5H2O and 1,4-dihydroxy-2,5-bis(pyrazol-1-yl)benzene. X-ray crystallography revealed linear chains running along the crystallographic a-direction and stacked along the b-axis. Within these chains, the CuII ions are coordinated by two pyrazolyl nitrogen atoms and two p-hydroquinone oxygen atoms in a square-planar fashion.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588109

http://pubs.acs.org/cgi-bin/abstract.cgi/inocaj/2006/45/i03/abs/ic051016z.html