Proton Magnetic Resonance Absorption Spectra of Long Chain Normal Primary Alcohol of Probable Carbon Number 32

Abstract

Proton magnetic resonance absorption from long chain normal primary alcohol of probable carbon number 32 was observed between 120°K and its melting point 355°K. Its absorption line width and second moment were constant below 260°K, being 15.5 gauss and 26.5 gauss², respectively. From 260°K to the transition point, the line width decreases gradually with increasing temperature and, at the transition point, abruptly decreases to 4.6 gauss. The narrowing of the absorption line below the transition point is considered to be due to the torsional vibration of the molecules around the carbon chain axis. The relation between the dielectric anomaly below the transition point observed by Takamatsu and the molecular motion revealed from nuclear resonance studies is discussed.