Title:	Pulsed NMR study of molecular motions and phase transitions in [N(CH3)4]PbX3 (X=Cl, Br, I)
Authors:	Vijayaraghavan, D. Ramakrishna, J.
Issue Date:	Jul-1993
Publisher:	Elsevier B.V.
Citation:	Spectrochimica Acta Part A: Molecular Spectroscopy, 1993, Vol. 49. p1121-1129
Abstract:	Proton spin—lattice relaxation time (T1) is measured in [N(CH3)4]PbX3 (X=Cl, Br, I) from 300-77 K at 9.75 MHz. All the compounds show discontinuous changes in T1 values (at 256, 270 and 277 K, respectively), indicating phase transitions. Single T1 minimum is observed in all the cases and the T1 variation is explained in terms of [N(CH3)4] and CH3 group dynamics. The activation energy Eα decreases from chloride to iodide (from 4 to 2 kcal/mol). In bromide and iodide, T1 is found to decrease with increase in temperature at higher temperatures, indicating the presence of spin—rotation interaction.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/7209
ISSN:	1386-1425
Alternative Location:	https://doi.org/10.1016/0584-8539(93)80071-H
Copyright:	1993 Elsevier B.V.
Appears in Collections:	Research Papers (SCM)

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