Multi-quantum quadrupole relaxation enhancement effects in Bi-209 compounds
JOURNAL OF CHEMICAL PHYSICS, vol.150, no.18, 2019 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 150 Issue: 18
- Publication Date: 2019
- Doi Number: 10.1063/1.5082007
- Journal Name: JOURNAL OF CHEMICAL PHYSICS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Open Archive Collection: AVESIS Open Access Collection
- Dokuz Eylül University Affiliated: Yes
Abstract
H-1 spin-lattice nuclear magnetic resonance relaxation experiments have been performed for triphenylbismuth dichloride (C18H15BiCl2) and phenylbismuth dichloride (C6H5BiCl2) in powder. The frequency range of 20-128 MHz has been covered. Due to H-1-Bi-209 dipole-dipole interactions, a rich set of pronounced Quadrupole Relaxation Enhancement (QRE) peaks (quadrupole peaks) has been observed. The QRE patterns for both compounds have been explained in terms of single- and double-quantum transitions of the participating nuclei. The analysis has revealed a complex, quantum-mechanical mechanism of the QRE effects. The mechanism goes far beyond the simple explanation of the existence of three quadrupole peaks for N-14 reported in literature. The analysis has been supported by nuclear quadrupole resonance results that independently provided the Bi-209 quadrupole parameters (amplitude of the quadrupole coupling constant and asymmetry parameter).