Structural Determination and Thermal Analysis of New Solid Modification for CCHS Compound

Abstract

A new solid modification of trans, trans-4′-pentylbicyclohexyl-4-carbonitrile (CCH5) is investigated by X-ray diffraction and thermoanalytical methods. It is crystallized in an orthorhombic cell: a = 31.281 (8) Å, b = 9.477 (3) Å c = 5.707 (2) Å, P2₁2₁2₁, Z = 4. The results illustrate that the structures of this solid modification and that of the homologous compound CCH7 are quite similar.

DSC and thermomicroscopic analysis show that the CCHS compound possesses two stable and one metastable solid phases. It also exhibits additional metastable smectic phases.

Key Words:

• liquid crystals
• structure
• thermal analysis