DSC studies of neohexanol and its isomers

Abstract

DSC method has been used to establish a solid state polymorphism of four dimethyl butanols having CH3 side groups: 2,2-dimethyl-1-butanol [CH3CH2C(CH3)2CH2OH)], 3,3-dimethyl-1-butanol [(CH3)3CCH2CH2OH], 3,3-dimethyl-2-butanol [(CH3)3CCH(OH)CH3] and 2,3-dimethyl-2-butanol [(CH3)2CHCOH(CH3)2]. Three isomers appear to be glass formers. Glass of liquid phase has been observed for 3,3-DM-1-B while glass of plastic phase for 2,2-DM-1-B and 3,3-DM-2-B. For 2,3-DM-2-B on cooling only crystallization has been found. Influence of location of the OH group in molecule on polymorphism is discussed. IR-spectra, measured in the liquid phase, have revealed hydrogen bonds in all isomers.