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Condis Crystals of Small Molecules III. Thermal Analysis of Plastic and Condis Crystals of some Cyclosilanes

1986; Volume: 140; Issue: 2-4 Linguagem: Inglês

10.1080/00268948608080156

0026-8941

Miao‐Yong Cao, J. P. Wesson, Kyriakos Loufakis, Bernhard Wunderlich, Martin Möller,

Synthesis and properties of polymers

Abstract Three cyclic methyl and ethyl substituted silanes were synthesized and their thermal properties analyzed. All show a plastic crystalline state which permits also ring and/or side-chain conformational motion as judged from the enthalpies of transition to the isotropic state. Heat capacity data and entropies of disordering into the plastic crystal leave open the possibility of a condis (conformationally disordered) state below the plastic crystal state with a continuous, transitionless freezing of the conformational motion at lower temperature.