Liquid crystalline G phase of self assembled donor-acceptor molecules by intermolecular hydrogen bonding |
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Authors: | S. Salma Begum C. Ravi Shankar Kumar |
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Affiliation: | a Department of Physics, Acharya Nagarjuna University Nagarjuna Nagar 522510 Indiab Department of Physics, Institute of Science, GITAM University Visakhapatnam 530045 India |
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Abstract: | The interaction with donor p-n-alkylbenzoic acid and acceptor nonyl-p-hydroxy benzoate molecules was studied. The likely association of these molecules to complexes is studied by intermolecular hydrogen bonding. The textures are observed by polarizing optical microscope with corresponding transitions confirmed by differential scanning calorimetry. The molecular complexes exhibited enantiotropic crystal G phases in both heating and cooling cycles. The relevant functional groups C═O, C-O and OH in formation of molecular complexes are attributed with spectral shifts in infrared spectra and further with absorption studies. The proton NMR studies convinced the structural aspects of hydrogen bonded structure. Crystal parameters were studied with powdered X-ray diffraction. The results show that constituent molecules self organize through intermolecular hydrogen bonding in the formation of crystal G phase. |
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Keywords: | PNBA NHB FTIR Intermolecular hydrogen bonding Crystal G phase |
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