Resolution of Motions in the Three Solid Phases of Methylammonium Chloride (CH3NH3Cl) by NMR.

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Abstract:

The alpha, beta, and gamma phases of solid methylammonium chloride CH3NH3Cl and its partially deuterated analogs CD3NH3Cl and CH3ND3Cl were investigated using temperature dependent static and rotating frame proton spin-lattice relaxation times, T1 and T1rho, respectively. Broadline proton magnetic resonance studies were performed in the supercooled gamma phases. It was found that partial deuteration causes the beta to gamma transition temperature to shift to higher temperatures. The motions in the three modifications of these substances were analyzed using the spin-lattice relaxation data and the second moments for the supercooled gamma phase. A resolution of the CH3 and NH3 rotations about the C-N axes was accomplished. The NMR results pertaining to the three phases of these compounds are discussed and related to other studies. Author

Author(s):
Albert, Shmuel ; Ripmeester, John A.
Author Organization(s):
ILLINOIS UNIV URBANA NOYES CHEMICAL LAB
Descriptive Note:
Technical rept.,
Pagination:
0025

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-35
Contract/Grant Number(s):
N00014-67-A-0305-0023
Project Number(s):
NR-051-215
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*AMMONIUM COMPOUNDS, *PHASE STUDIES), (*NUCLEAR MAGNETIC RESONANCE, AMMONIUM COMPOUNDS), SALTS, CHLORIDES, DEUTERIUM COMPOUNDS, RELAXATION TIME, ROTATION, CHEMICAL BONDS
Field(s)/Group(s):
Physical Chemistry
Keyword(s):
*AMMONIUM CHLORIDE METHYL, ROTATION(CHEMICAL BONDS), SPIN LATTICE RELAXATION
Report Date:
1972 Sep 06