1H nuclear magnetic resonance studies on cationic reorientation and translational self-diffusion in two solid phases, including a new high-temperature phase of methylammonium sulphate

Hiroyuki Ishida, Noritoshi Matsuhashi, Ryuichi Ikeda, Daiyu Nakamura

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13 Citations (Scopus)

Abstract

The temperature dependences of the proton spin-lattice and spin-spin relaxation times, and also the second moment of the 1H n.m.r. absorptions of (CH3NH3)2SO4 and its partially deuterated analogue, have been observed in a wide temperature range, including a new high-temperature solid phase obtainable above 428 K. X-Ray powder patterns obtained at ca. 450 K revealed that the crystal in this phase has a hexagonal structure isomorphous with the α-form of K2SO4. From 1H n.m.r. experiments it was found that the cations in the high-temperature phase undergo overall reorientation as well as translational self-diffusion. The presence of these motions suggests that this new phase is in a state resembling the plastic phase of molecular crystals. In the low-temperature phase a reorientation of the CH3 and NH3- groups of the cation about the C-N bond axis was observed. The motional parameters for these motional modes were evaluated.

Original languageEnglish
Pages (from-to)111-120
Number of pages10
JournalJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
Volume85
Issue number1
DOIs
Publication statusPublished - Dec 1 1989
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)

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