Coordination Studies of the Metal Center of Hemocyanin by 199mHg Nuclear Quadrupole Interaction

2002 ◽  
Vol 57 (6-7) ◽  
pp. 623-626
Author(s):  
W. Tröger ◽  
B. Ctortecka ◽  
P. Faller ◽  
H. Decker
Keyword(s):  
Quadrupole Interaction ◽  
Nuclear Quadrupole Interaction ◽  
Copper Protein ◽  
Angular Correlations ◽  
Metal Site ◽  
Perturbed Angular Correlations ◽  
Time Differential ◽  
Γ Rays ◽  
Nuclear Quadrupole ◽  
Binuclear Metal

The nuclear quadrupole interaction of 199mHg monitored by time differential perturbed angular correlations of γ-rays was employed to investigate the binding of Hg(II) to the binuclear metal site in the copper protein hemocyanin Eurypelma californicum. The data indicate that Hg(II) occupies the two metal sites and alters the metal site geometry from a trigonal to a digonal coordination

The Nuclear Quadrupole Interaction of 187W(β–)187Re in W(VI)-EDTA Complexes

2002 ◽  
Vol 57 (6-7) ◽  
pp. 620-622 ◽  
Author(s):  
Guida Sun ◽  
Weiqiao Liu ◽  
Tilman Butz
Keyword(s):  
Quadrupole Interaction ◽  
Room Temperature ◽  
Nuclear Quadrupole Interaction ◽  
Edta Complex ◽  
Angular Correlations ◽  
Perturbed Angular Correlations ◽  
Edta Complexes ◽  
Time Differential ◽  
Nuclear Quadrupole ◽  
Asymmetry Parameters

The nuclear quadrupole interaction of 187W(β-)187Re in W(VI)-EDTA complexes at room temperature was determined by time differential perturbed angular correlations (TDPAC) to be VQ = 1270(8) MHz with an asymmetry parameter η= 0.403(4). While the coordination geometry of the Mo(VI)- EDTA complex is known, there appears to be none for the W-analogue. The rather similar asymmetry parameters for the 187W(β-)187Re in W(VI)-EDTA complex and for the 99Mo(β-)99Tc in Mo(VI)- EDTA complex, determined previously, supports the idea that the coordination geometries in the Moand W-complexes are similar

Nuclear Quadrupole Interactions Studied by Time Differential Perturbed Angular Correlations of γ-Rays

1996 ◽  
Vol 51 (5-6) ◽  
pp. 396-410 ◽  
Author(s):  
T. Butz
Keyword(s):  
Perturbed Angular Correlation ◽  
Angular Correlations ◽  
Quadrupole Interactions ◽  
Perturbed Angular Correlations ◽  
Nuclear Quadrupole Interactions ◽  
Quadrupole Resonance ◽  
Time Differential ◽  
Excited Nuclei ◽  
Γ Rays ◽  
Nuclear Quadrupole

Abstract This paper gives an elementary introduction to time differential perturbed angular correlation of γ-rays emitted from excited nuclei with particular reference to nuclear quadrupole interactions. We start with a comparison to other techniques such as nuclear quadrupole resonance and the Mössbauer effect, quote all necessary formulae, describe a typical spectrometer, list suitable isotopes, and finally give some examples for modern applications.

The Nuclear Quadrupole Interaction of 199mHg-Cysteine and 199mHg-tert-butyl-mercaptide

1992 ◽  
Vol 47 (1-2) ◽  
pp. 85-88 ◽  
Author(s):  
T. Butz ◽  
W. Tröger ◽  
Th. Pöhlmann ◽  
O. Nuyken
Keyword(s):  
Quadrupole Interaction ◽  
Room Temperature ◽  
Interaction Strength ◽  
Nuclear Quadrupole Interaction ◽  
Angular Correlations ◽  
Tert Butyl ◽  
Perturbed Angular Correlations ◽  
Dramatic Difference ◽  
Carrier Free ◽  
Nuclear Quadrupole

AbstractThe nuclear quadrupole interaction of 199mHg in Hg-cysteine and Hg-tert-butyl mercaptide was determined at room temperature by perturbed angular correlations. The dramatic difference in the interaction strength between both compounds is a result of the two-fold and four-fold sulfur coordination, respectively. Moreover, we compared the preparation of Hg-cysteine using a Hg: cysteine ratio of 1:2 and using carrier-free 199mHg from ISOLDE/CERN and obtained identical results.

Hg-Coordination Studies of Cysteine Containing Oligopeptides

1996 ◽  
Vol 51 (5-6) ◽  
pp. 427-430 ◽  
Author(s):  
W. Tröger ◽  
C. Lippert ◽  
P. Schmidt ◽  
U. Schmidt ◽  
T. Butz ◽  
...  
Keyword(s):  
Quadrupole Interaction ◽  
Nuclear Quadrupole Interaction ◽  
Time Differential ◽  
Nuclear Quadrupole

Abstract In order to study the interaction of cysteine containing peptide chains with Hg(II) the nuclear quadrupole interaction (NQI) of 199mHg in the Hg complex of the oligopeptide Alanine-Alanine-Cysteine-Alanine-Alanine (AACAA) was determined by time differential perturbed angular correla-tion. Different 199mHg-NQI’s for free and resin-bound AACAA were obtained. Furthermore, the 199mHg-NQI’s are influenced by the Hg:AACAA stoichiometry.

Nuclear Quadrupole Interaction at 187W(β-)187Re in Tungsten Compounds

1998 ◽  
Vol 53 (6-7) ◽  
pp. 323-339
Author(s):  
Pit Schmidt ◽  
Torsten Soldner ◽  
Wolfgang Tröger ◽  
Xinbo Ni ◽  
Tilman Butz ◽  
...  
Keyword(s):  
Experimental Data ◽  
Quadrupole Interaction ◽  
Asymmetry Parameter ◽  
Perturbed Angular Correlation ◽  
Nuclear Quadrupole Interaction ◽  
Electric Field Gradients ◽  
Field Gradients ◽  
Time Differential ◽  
Nuclear Quadrupole ◽  
Good Agreement

.6(The nuclear quadrupole interaction at 187W(β-)187 Re was determined by time differential perturbed angular correlation in WC, WS2, WSe2, WSi2, and CaWO4 to be (at 300 K): vQ = 335.9(2), 1094.9(1), 10311), 1131,5( 1), and 1085.9( 1) MHz, respectively. The asymmetry parameter ƞwas zero in all cases. For WSe2 and CaWO4 the temperature dependence of the nculear quadrupole interaction was determined between 300 K and about 900 K. Ab initio calculations of electric field gradients, using the WIEN95-code, were carried out for WC, WS2, WSe2, and WSi2 at W-sites and Re-impurities, and for CaWO4 at W-sites. Good agreement with experimental data was found.

The 111mCd Nuclear Quadrupole Interaction in CdCl2 and its Monohydrate

1992 ◽  
Vol 47 (1-2) ◽  
pp. 89-95
Author(s):  
Th. Fraenzke ◽  
T. Butz ◽  
A. Lerf
Keyword(s):  
Angular Correlation ◽  
Quadrupole Interaction ◽  
Perturbed Angular Correlation ◽  
Nuclear Quadrupole Interaction ◽  
Temperature Range ◽  
Time Differential ◽  
Nuclear Quadrupole

AbstractThe 111mCd nuclear quadrupole interaction in CdCl2 and CdCl2 • H2O was determined in the temperature range from 77 K to 783 K and 363 K, respectively, by time differential perturbed angular correlation. In addition, both the crystallization of the monohydrate from solution and its dehydration were monitored in situ.

Applications of Nuclear Quadrupole Interactions in Materials Research

1998 ◽  
Vol 53 (6-7) ◽  
pp. 340-348 ◽  
Author(s):  
Zhu Shengyun
Keyword(s):  
Angular Correlation ◽  
Quadrupole Interaction ◽  
Perturbed Angular Correlation ◽  
Nuclear Quadrupole Interaction ◽  
Quadrupole Interactions ◽  
Nuclear Quadrupole Interactions ◽  
Time Differential ◽  
Materials Research ◽  
Microscopic Studies ◽  
Nuclear Quadrupole

Abstract The principle of the time differential perturbed angular correlation and distribution technique which measures the nuclear quadrupole interaction is briefly described. Some examples are given to show the possibilities of this technique in microscopic studies of materials.

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