Liquid crystalline G phase of self assembled donor–acceptor molecules by intermolecular hydrogen bonding

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• 作者：S. Salma Begum^a ; T. Vindhya Kumari^a ; C. Ravi Shankar Kumar^b ; S. Sreehari Sastry^a ; ^{anusshari@gmail.com}
• 关键词：PNBA ; NHB ; FTIR ; Intermolecular hydrogen bonding ; Crystal G phase
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2011
• 出版时间：1 April 2011
• 年：2011
• 卷：357
• 期：7
• 页码：1745-1749
• 全文大小：434 K

文摘

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.