Mesomorphic behaviour and vibrational dynamics of nCFPB liquid crystalline homologues

ABSTRACT

Mesomorphic behaviour, dependent on the rate of temperature change, is shown for 6CFPB, the sixth homologue of the series of 4-cyano-3-fluorophenyl 4'-n-benzoates (nCFPB). The phase sequence presented was established by differential scanning calorimetry, and further confirmed by polarized light microscopy optical texture analysis. Molecular vibrational dynamics, across the temperature range covered, is discussed for 6CFPB, and compared with that of two neighbouring even homologues: 4CFPB and 8CFPB (FTIR spectroscopy aided by model DFT calculations).

KEYWORDS:

• FTIR spectroscopy
• vibrational spectra
• DSC
• POM
• liquid crystals
• 4-cyano-3-fluorophenyl 4'-n-hexylbenzoate

Acknowledgements

EJG acknowledges funding from the JINR collaboration programme with the research groups in Poland. (Studies of selected soft materials and compounds for hydrogen storage. Investigation of condensed matter by neutron scattering methods. Subject no: 04-4-1121-2015-2020).

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

E. Juszyńska-Gałązka http://orcid.org/0000-0002-3964-0721

W. Zając http://orcid.org/0000-0001-9957-1206