NMR relaxation and linewidths in a series of alkoxyazoxybenzenes

Autor:	M. E. Field, C.E Tarr, R. C. Matthews, A. L. Kuo, Tony C. Moore, Chas. G. Wade
Rok vydání:	1980
Předmět:	Condensed Matter::Soft Condensed Matter Phase transition Laser linewidth Thermal hysteresis Series (mathematics) Condensed matter physics Infrared Chemistry Phase (matter) Relaxation (NMR) General Engineering Cooling curve
Zdroj:	Journal of Magnetic Resonance (1969). 38:135-139
ISSN:	0022-2364
DOI:	10.1016/0022-2364(80)90185-7
Popis:	Nuclear spin relaxation, rotating frame relaxation, and second-moment linewidth studies have been used to study ordering and dynamics in the solid and mesophases of a series of 4,4′-(bis)alkoxyazoxybenzenes. Results were obtained for both heating and cooling curves. Heptyloxyazoxybenzene smectic C phase second-moment data show a thermal hysteresis and a simple model is developed to explain the results. T1 and T1ϱ do not show thermal hysteresis but T1ϱ is sensitive to the nematic-smectic C transition. A phase transition in the solid phase of butyloxyazoxybenzene, indicated by previous infrared studies, is not evident in T1 and second-moment data for that compound.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0956ea9e010da8329c6853c83bd5f6f4 https://doi.org/10.1016/0022-2364(80)90185-7 Zobrazit plný text záznamu