Vibrational Spectroscopic Studies of Phase Transitions in Organic Molecular Crystals and Dicarboxylic Acids

Order-disorder transitions in 2,3-benzothiophene and cyclopentyl- 1-thiaethane as well as the vibronic effects in the phase transitions of the alkali metal salts of TCNQ have been investigated by infrared spectroscopy. In all these cases, marked variations in band intensities accompany the transitions. Existence of two crystalline forms of methylcyclohexane has been established by infrared spectroscopy. Phase transitions of aliphatic dicarboxylic acids have been examined with particular attention to the transiti_ ons in malonic, succinic, and glutaric acids

Vibrational Spectroscopic Studies of Phase Transitions in Organic Molecular Crystals and Dicarboxylic Acids

Order-disorder transitions in 2,3-benzothiophene and cyclopentyl- 1-thiaethane as well as the vibronic effects in the phase transitions of the alkali metal salts of TCNQ have been investigated by infrared spectroscopy. In all these cases, marked variations in band intensities accompany the transitions. Existence of two crystalline forms of methylcyclohexane has been established by infrared spectroscopy. Phase transitions of aliphatic dicarboxylic acids have been examined with particular attention to the transiti_ ons in malonic, succinic, and glutaric acids