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Media type:
E-Article
Title:
NMR Studies on the Rotational Motion of Coordinated D2O Molecules in MBr (M=Li+, Na+, K+, Cs+) Dilute Aqueous Solutions
Contributor:
Shimizu, Akio;
Taniguchi, Yoshihiro
Published:
Oxford University Press (OUP), 1990
Published in:
Bulletin of the Chemical Society of Japan, 63 (1990) 6, Seite 1572-1577
Language:
English
DOI:
10.1246/bcsj.63.1572
ISSN:
0009-2673;
1348-0634
Origination:
Footnote:
Description:
Abstract The parallel (D,τ⁄⁄) and perpendicular (17O,τ⊥) rotational correlation times of coordinated D2O molecules in MBR (M=Li+, Na+, K+, Cs+ aqueous solutions in the concentration range of 0.2 to 1.0 molkg−1 at 25 °C were determined by NMR. The spin-lattice relaxation rates (R1) varied linearly with increase in concentration up to 1.0 molkg−1. The ratios (τ⁄⁄/τ⊥) of the rotational correlation times of coordinated D2O molecules in Li+, Na+, K+, and Cs+ ions were 1.12, 1.13, 0.89, and 0.92, respectively. These results indicate that for coordinated D2O molecules in Li+ and Na+ ions, the perpendicular rotational motion is 10% faster than the parallel one. On the other hand, for coordinated D2O molecules in K+ and Cs+ ions, the tendency was reversed. These results are explained in terms of both the Eulerian angle β between the diffusion tensors with the molecular plane and the intermolecular interactions between the ions and D2O molecules.