Hindered molecular reorientation of lithium ion doped succinonitrile in the terahertz range
The THz range permittivity of succinonitrile exhibits Debye-like behavior in its plastic-crystal phase, with a characteristic Cole-Cole relaxation time of 65ps ±17ps which increases considerably in the presence of ionic dopants.
Molecular reorientation rates in crystals by anisotropic light scattering
The rate of molecular reorientation in a crystal has been measured for the first time from the spectrum of scattered light using the same techniques that have previously been used for liquids. The molecular reorientational correlation time for succinonitrile in the plastic crystal phase at 19°C is found to be 4.0 × 10-11 s which is in good agreement with the value 4.4 × 10-11 s found by nuclear magnetic resonance. The method is thought to be of wide application.
The guaianolides of ambrosia cumanensis HBK : The structures of cumambrins A and B☆
Abstract Cumambrins A and B isolated from Ambrosia cumanensis HBK were shown to be guaianolides with structures Ia and Ib.