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Title: Mono-, di-, and oligonuclear complexes of Cu-II ions and p-hydroquinone ligands: Syntheses, electrochemical properties, and magnetic Behavior
Authors: Margraf, G.
Kretz, T.
Fabrizi De Biani, Fabrizia 
Laschi, Franco 
Losi, S.
Zanello, Piero
Bats, J. W.
Wolf, B.
Removic Langer, K.
Lang, M.
Prokofiev, A.
Assmus, W.
Lerner, H. W.
Wagner, M.
Issue Date: 2006
Project: None 
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.
ISSN: 0020-1669
DOI: 10.1021/ic051016z
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