13C NMR relaxation studies of 1:2 LiCl-ethylaluminum dichloride solutions

Autor:	Gilbert J. Mains, W. Robert Carper, Charles E. Keller, Bernard J. Piersma
Rok vydání:	1995
Předmět:	Coupling constant Dimer Relaxation (iterative method) chemistry.chemical_element Carbon-13 NMR Inorganic Chemistry chemistry.chemical_compound chemistry Materials Chemistry Physical chemistry Organic chemistry Physical and Theoretical Chemistry Molten salt Methylene Anisotropy Carbon
Zdroj:	Inorganica Chimica Acta. 230:185-188
ISSN:	0020-1693
DOI:	10.1016/0020-1693(94)04197-4
Popis:	A new room-temperature molten salt, 1:2 LiCl-ethylaluminum dichloride (LiCl-EtAlCl2, f.p. about 178 K), is examined using 13C relaxation methods at 7.05 T (−25 to + 80 °C). The methylene carbon undergoes scalar relaxation of the ‘second kind’ as it is coupled to a faster relaxing (quadrupolar) nucleus. LiCl-EtAlCl2 undergoes a significant liquid-state phase change between 5 and 15 °C as evidenced by observed changes in the relaxation properties of the methylene and methyl carbons and J(13C−27Al). The J(13C−27Al) coupling constants are 75 (− 10 to + 5 °C) and 11 Hz (15–65 °C), indicating a change in structure between 5 and 15 °C. Chemical shift anisotropies of 56 and 48 ppm are obtained for the methylene and methyl carbons in the EtAlCl2 dimer part of the 1:2 LiCl-EtAlCl2 solution.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5e38138355fe5950af80378f11a8e4ca https://doi.org/10.1016/0020-1693(94)04197-4 Zobrazit plný text záznamu Full Text from ScienceDirect