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'TDPAC' in keywords
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2000 (1)
1996 (2)
1Author    W. Tröger, C. Lippert, P. Schmidt, U. Schmidt, T. Butz, R. Hoffmann, M. ZeppezauerRequires cookie*
 Title    Hg-Coordination Studies of Cysteine Containing Oligopeptides * and the ISOLDE Collaboration 0  
 Abstract    In order to study the interaction of cysteine containing peptide chains with Hg(II) the nuclear quadrupole interaction (NQI) of 199m Hg in the Hg complex of the oligopeptide Alanine-Alanine-Cysteine-Alanine-Alanine (AACAA) was determined by time differential perturbed angular correla-tion. Different 199m Hg-NQI's for free and resin-bound AACAA were obtained. Furthermore, the 199m Hg-NQI's are influenced by the Hg:AACAA stoichiometry. 
  Reference    Z. Naturforsch. 51a, 427—430 (1996); received October 20 1995 
  Published    1996 
  Keywords    TDPAC, Nuclear quadrupole interaction, Oligopeptides, Hg-Coordination 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0427.pdf 
 Identifier    ZNA-1996-51a-0427 
 Volume    51 
2Author    W. Tröger, C. Lippert, T. Butz, K. Sigfridsson, Ö. Hansson, E. Mclaughlin, R. Bauer, E. Danielsen, L. Hemmingsen, M. J. BjerrumRequires cookie*
 Title    Small Scale Intramolecular Flexibility in lllm Cd-Plastocyanin  
 Abstract    The effect of mutations in the vicinity of the putative electron transfer path on the metal center of the electron transfer protein plastocyanin (spinacea) is investigated by monitoring the nuclear quadrupole interaction of 1Um Cd in Cd-derivatives of the protein via time differential perturbed angular correlation. The spectra for the wild type protein and the mutants were rather similar. All spectra exhibit a peculiar line profile which points towards a small scale intramolecular flexibility of the metal center. 
  Reference    Z. Naturforsch. 51a, 431—436 (1996); received October 20 1995 
  Published    1996 
  Keywords    TDPAC, Nuclear quadrupole interaction, lllm Cd-Plastocyanin, flexibility 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0431.pdf 
 Identifier    ZNA-1996-51a-0431 
 Volume    51 
3Author    J. M. Ramallo-López, F. G. Requejo, A. G. Bibiloni, M. Rentería, L. Gutierrez, E. E. MiróRequires cookie*
 Title    Combined TDPAC and EXAFS Study of InPt/FER Catalysts  
 Abstract    Time Differential Perturbed Angular Correlation (TDPAC) experiments using 111 In as probe were performed in order to determine the nature of In-sites in In-ferrierite (In/FER), before and after the incorporation of Pt through the hyperfine interaction between the nuclear quadrupole moment of the probe's nucleus and the extranuclear electric field gradient (EFG). Extended X-ray Absorption Fine Structure (EXAFS) measurements were performed to measure the absorbance above the Pt's L m absorption edge in the transmission mode in order to determine the local environment of Pt atoms in Pt/FER and InPt/FER catalysts. TDPAC spectra of 111 In in In/FER and InPt/FER taken at 500°C in air indicated that there are no changes in the indium surroundings after the incorporation of Pt. Three sites were found for indium in both samples. Two of them correspond to the two sites of indium in ln 2 0 3 and the third one is attributed to In in exchange sites of the zeolites. Their population, quadrupole frequencies and asymmetry parameters didn't change with the incorporation of Pt. EXAFS experiments showed similar near neighborhood Pt-0 distances and Pt coordination number in Pt/FER and InPt/FER samples. There is no evidence of the presence of any In-Pt bimetallic entity in InPt/FER catalyst. 
  Reference    Z. Naturforsch. 55a, 327—330 (2000); received August 26 1999 
  Published    2000 
  Keywords    Hyperfine Interactions, TDPAC, EXAFS, Catalysis, Ferrierite 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0327.pdf 
 Identifier    ZNA-2000-55a-0327 
 Volume    55