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'Copper Complexes' in keywords Facet   Publication Year 1993  [X]
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1993[X]
1Author    Conny Vogler, Wolfgang Kaim, H.-D HausenRequires cookie*
 Title    Zweikernige Bisphosphankupfer(I)-Komplexe mit dem 2,2 -Bipyrimidin-Brückenliganden: Strukturelle Analogie zu "Blauen" Kupferzentren und Reduktion zu paramagnetischen Spezies Dinuclear Bis(phosphane)copper(I) Complexes with 2,2'-Bipyrimidine as Bridging Ligand: Structural Analogy to " Blue" Copper Centers and Reduction to Paramagnetic Species  
 Abstract    Dinuclear complexes [(PR3)2C u(//:/74-bpym)Cu(PR3)2](BF4)2 with the bis-chelating bridging ligand 2,2'-bipyrimidine (bpym) and various m onodentate and bidentate phosphanes were synthesized via a four com ponent "self assembly" reaction. The reversible electrochemical reduction to m onocationic radical complexes was studied by cyclic voltammetry and electron spin resonance (ESR). Highly resolved ESR spectra revealed the presence o f the bpym anion radical ligand via resolved hyperfine coupling with 'H, 14N , 31P, 63Cu and 65Cu nuclei. The variation o f phosphane ligands was accompanied by significant changes o f electrochemical potentials which were rationalized considering electronic and structural effects. The configura­ tional flexibility o f Cu(I) in this environment is evident from the X-ray crystal structure ana­ lysis o f [(PPh3)2C u(//:^4-bpym)Cu(PPh3)2](BF4)2 H2O C H 3OH for which the coordination at the metal can be described as 3 + 1 (N N'P + P'), qualitatively similar to the (NN'S + S') arrange­ ment around the type 1 Cu centers o f "blue" copper proteins. Intramolecular cooperative n donor/;: acceptor/^ donor "Sandwich" interactions provide parts o f the driving force for this highly distorted coordination geometry which illustrates the proclivity o f Cu(I) towards such an "entatic state" arrangement. 
  Reference    Z. Naturforsch. 48b, 1470—1480 (1993); eingegangen am 5. Mai 1993 
  Published    1993 
  Keywords    Copper Complexes, Structure, Electrochemistry, ESR Spectra, Phosphane Ligands 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1470.pdf 
 Identifier    ZNB-1993-48b-1470 
 Volume    48 
2Author    J.-X Boucherle, E. Ressouche, J. Schweizer, B. Gillon, P. ReyRequires cookie*
 Title    Spin Densities in Copper-Nitronyl Nitroxide Complexes  
 Abstract    The spin density in two copper-nitronyl nitroxide complexes, viz. bis(hexafluoroacetylacetonato)-(2,4,4,5,5-pentamethyl-l-oxy-imidazoline 3-oxide)-copper(II) and dichloro-bis(2-phenyl-4,4,5,5-tetra-methyl-l-oxy-imidazoline 3-oxide)-copper(II), has been determined by polarised-neutron diffrac-tion. Spin populations and unpaired electron wave functions have been refined. 
  Reference    Z. Naturforsch. 48a, 120—122 (1993); received February 7 1992 
  Published    1993 
  Keywords    Nitronyl nitroxide free radicals, Copper complexes, Polarised neutron diffraction, Spin density 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0120.pdf 
 Identifier    ZNA-1993-48a-0120 
 Volume    48