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Title: Dynamics of [C{sub 3}H{sub 5}N{sub 2}]{sub 6}[Bi{sub 4}Br{sub 18}] by means of {sup 1}H NMR relaxometry and quadrupole relaxation enhancement

{sup 1}H spin-lattice field cycling relaxation dispersion experiments in the intermediate phase II of the solid [C{sub 3}H{sub 5}N{sub 2}]{sub 6}[Bi{sub 4}Br{sub 18}] are presented. Two motional processes have been identified from the {sup 1}H spin-lattice relaxation dispersion profiles and quantitatively described. It has been concluded that these processes are associated with anisotropic reorientations of the imidazolium ring, characterized by correlation times of the order of 10{sup −8} s-10{sup −9} s and of about 10{sup −5} s. Moreover, quadrupole relaxation enhancement (QRE) effects originating from slowly fluctuating {sup 1}H-{sup 14}N dipolar interactions have been observed. From the positions of the relaxation maxima, the quadrupole coupling parameters for the {sup 14}N nuclei in [C{sub 3}H{sub 5}N{sub 2}]{sub 6}[Bi{sub 4}Br{sub 18}] have been determined. The {sup 1}H-{sup 14}N relaxation contribution associated with the slow dynamics has been described in terms of a theory of QRE [Kruk et al., Solid State Nucl. Magn. Reson. 40, 114 (2011)] based on the stochastic Liouville equation. The shape of the QRE maxima (often referred to as “quadrupole peaks”) has been consistently reproduced for the correlation time describing the slow dynamics and the determined quadrupole coupling parameters.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ; ;  [5] ;  [6]
  1. Department of Physics and Material Research, University of Economy, Garbary 2, 85-229 Bydgoszcz (Poland)
  2. Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, Oczapowskiego 7, 10719 Olsztyn (Poland)
  3. Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków (Poland)
  4. Faculty of Chemistry, University of Wroclaw, Joliot Curie 14, 50-383 Wroclaw (Poland)
  5. Institut für Festkörperphysik, TU Darmstadt, Hochschulstr. 6, 64289 Darmstadt (Germany)
  6. Faculty of Mathematics and Computer Science, University of Warmia and Mazury in Olsztyn, Słoneczna 54, 10710 Olsztyn (Poland)
Publication Date:
OSTI Identifier:
22415876
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANISOTROPY; BISMUTH BROMIDES; BOLTZMANN-VLASOV EQUATION; CORRELATIONS; COUPLING; HYDROGEN 1; IMIDAZOLES; NITROGEN 14; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; SOLIDS; SPIN; SPIN-LATTICE RELAXATION; STOCHASTIC PROCESSES