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1992 (1)
1979 (1)
1Author    Conny Vogler, Wolfgang KaimRequires cookie*
 Title    Einkernige Bis(triphenylphospin)kupfer(I)-Komplexe der Bidiazine M ononuclear Bis(triphenylphosphine)copper(I) Complexes of the Bidiazines  
 Abstract    The cationic d 10 metal complexes [(bdz)Cu(PPh3).J+ o f the n accepting bidiazine (bdz) che­ late ligands 3,3'-bipyridazine, 2,2'-bipyrazine, 2,2'-and 4,4'-bipyrimidine were synthesized and compared with the analogous com plex o f 2,2'-bipyridine. The long wavelength metal-to-ligand charge transfer (M LCT) absorption maxima and the reduction potentials indicate relatively little 7i* orbital stabilization by +Cu(PPh3)2. The particular d orbital splitting in a tetrahedral ligand field results in an additional contribution from J , to the energy difference between the first and second MLCT band. Only the most easily reduced com plexes o f 4,4'-bipyrimidine and 2,2'-bipyrazine yield neutral radical complexes ("Cu(0)") which were characterized by ESR spectroscopy. 
  Reference    Z. Naturforsch. 47b, 1057—1062 (1992); eingegangen am 11. März 1992 
  Published    1992 
  Keywords    Copper Complexes, Heterocyclic Ligands, Electrochemistry, Absorption Spectroscopy, ESR Spectra 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1057.pdf 
 Identifier    ZNB-1992-47b-1057 
 Volume    47 
2Author    J. Luisetti, H. Möhwald, H. J. GallaRequires cookie*
 Title    Spectroscopic and Thermodynamic Studies of Chlorophyll Containing Monolayers and Vesicles Part II: Chlorophyll a and Pheophytin a Aggregation on DMPC Vesicles  
 Abstract    Absorption and fluorescence experiments on pheophytin and chlorophyll containing lipid bilayer vesicles are reported. Pheophytin aggregates on the vesicles are established from an additional red shifted band (at 695 nm) in the absorption spectrum. These aggregates contain pheophytin in an arrangement with the molecular planes of the porphyrin rings being parallel and cover about 10% of the vesicle surface. The lipid phase dissolves pheophytin up to a molar ratio of 15% above the lipid phase transition. This solubility limit decreases hardly on solidification of the lipid. For chlorophyll a containing vesicles the aggregates are not observed in the absorption spectrum. The chlorophyll solubility is about equal to that of pheophytin. This suggests that the phase separa­ tion indicated from fluorescence measurements at temperatures below the lipid phase transition does not lead to the formation of strongly bound chlorophyll aggregates. In tro d u c tio n 
  Reference    Z. Naturforsch. 34c, 406—413 (1979); received January 25 1979 
  Published    1979 
  Keywords    Lipid Bilayers, Chlorophyll, Phase Separation, Absorption Spectroscopy, Fluorescence Spectroscopy 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0406.pdf 
 Identifier    ZNC-1979-34c-0406 
 Volume    34