Physical properties of 8OS5 thioester studied by complementary methods

ABSTRACT

Properties of 4-n-pentylphenyl-4’-n-octyloxythiobenzoate (8OS5), belonging to the nOS5 homologous series, have been studied by complementary methods. The phase sequence, the phase transition temperatures, the thickness of molecular layers, the average distance between long axes of molecules and the correlation length were determined during cooling and heating. For the first time, simultaneous X-ray diffraction and differential scanning calorimetry measurements have been used to study mesomorphic properties. The results are compared with the ones obtained in standard measurements by means of differential scanning calorimetry, X-ray diffraction and polarizing optical microscopy. Meaning of experimental procedures applied in investigations of monotropic mesophases below a melting point is discussed.

KEYWORDS:

• Calamitic liquid crystals
• mesophases
• mesomorphic properties
• XRD–DSC measurements
• X-ray diffraction
• differential scanning calorimetry
• polarizing optical microscopy

Acknowledgments

One of the authors (A. Deptuch) would like to acknowledge kind hospitality during her stay in the Application Laboratories of the Rigaku Corporation. The research was carried out with the equipment purchased, thanks to the financial support of the European Regional Development Fund Operational Program Infrastructure and Environment contract no. POIS 13.01.00-00-062/08 (X-ray diffractometer Empyrean 2 equipped with the Cryostream 700 Plus) and the European Regional Development Fund in the framework of the Polish Innovation Economy Operational Program contract no. POIG.02.01.00-12-023/08 (DSC 8000 Perkin Elmer calorimeter).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work is supported by European Regional Development Fund in the framework of the Polish Innovation Economy Operational Program [grant number POIG.02.01.00-12-023/08]; European Regional Development Fund Operational Program Infrastructure and Environment [grant number POIS 13.01.00-00-062/08].