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H-2 Solid-State NMR of Ruthenium Complexes

Walaszek, B. and Adamczyk, A. and Pery, T. and Xu, Y. P. and Gutmann, T. and Amadeu, N. D. and Ulrich, S. and Breitzke, H. and Vieth, H. M. and Sabo-Etienne, S. and Chaudret, B. and Limbach, H. H. and Buntkowsky, G. (2008):
H-2 Solid-State NMR of Ruthenium Complexes.
In: Journal of the American Chemical Society, pp. 17502-17508, 130, (51), [Online-Edition: http://apps.webofknowledge.com/full_record.do?product=WOS&se...],
[Article]

Abstract

The H-2 solid-state NMR spectra of the transition metal complexes Tp*RuD(THT)(2) (1a), Tp*RuD(D-2)(THT) (1b), Tp*RuD(D-2)(2) (1c), Cp*RuD3(PPh3) (2) and RuD2(eta(2)-D-2)(2)(PCY3)(2) (3) have been measured in a wide temperature range. These compounds were chosen as potential model systems for hydrogen surface species in Ru-nanoparticles. The deuterium quadrupolar coupling constants Q(cc) and asymmetry parameters were extracted by H-2 NMR line-shape analysis. The Q(cc) c values of the deuterons bound to the metal vary between 13 kHz and 76 kHz. In addition all spectra show that some of the deuterium is incorporated into carbon positions exhibiting quadrupolar coupling constants in the range of 134 kHz to 192 kHz. The room temperature spectra contain an additional weak very narrow line which was assigned to deuterons exhibiting a high mobility. These deuterons are attributed to crystallographic impurity and partially to D-2 molecules which lost by the complexes. The temperature where their motion is quenched and the types of these motions depend on the chemical structure. We propose to use the values of the quadrupolar coupling constants measured in order to characterize different hydrogen species on the surface of Ru-nanoparticles.

Item Type: Article
Erschienen: 2008
Creators: Walaszek, B. and Adamczyk, A. and Pery, T. and Xu, Y. P. and Gutmann, T. and Amadeu, N. D. and Ulrich, S. and Breitzke, H. and Vieth, H. M. and Sabo-Etienne, S. and Chaudret, B. and Limbach, H. H. and Buntkowsky, G.
Title: H-2 Solid-State NMR of Ruthenium Complexes
Language: English
Abstract:

The H-2 solid-state NMR spectra of the transition metal complexes Tp*RuD(THT)(2) (1a), Tp*RuD(D-2)(THT) (1b), Tp*RuD(D-2)(2) (1c), Cp*RuD3(PPh3) (2) and RuD2(eta(2)-D-2)(2)(PCY3)(2) (3) have been measured in a wide temperature range. These compounds were chosen as potential model systems for hydrogen surface species in Ru-nanoparticles. The deuterium quadrupolar coupling constants Q(cc) and asymmetry parameters were extracted by H-2 NMR line-shape analysis. The Q(cc) c values of the deuterons bound to the metal vary between 13 kHz and 76 kHz. In addition all spectra show that some of the deuterium is incorporated into carbon positions exhibiting quadrupolar coupling constants in the range of 134 kHz to 192 kHz. The room temperature spectra contain an additional weak very narrow line which was assigned to deuterons exhibiting a high mobility. These deuterons are attributed to crystallographic impurity and partially to D-2 molecules which lost by the complexes. The temperature where their motion is quenched and the types of these motions depend on the chemical structure. We propose to use the values of the quadrupolar coupling constants measured in order to characterize different hydrogen species on the surface of Ru-nanoparticles.

Journal or Publication Title: Journal of the American Chemical Society
Volume: 130
Number: 51
Uncontrolled Keywords: transition-metal dihydrides nanoparticles reactivity spectroscopy coherent derivatives dynamics shape
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 27 Oct 2014 20:52
Official URL: http://apps.webofknowledge.com/full_record.do?product=WOS&se...
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406UO Times Cited:22 Cited References Count:28

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