Structure property relationships of some new liquid crystalline materials

Bhagavath, Poornima (2017) Structure property relationships of some new liquid crystalline materials. Phd. Thesis thesis, Manipal Institute of Technology, Manipal.

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The research on the stabilization and realization of mesomorphism through intermolecular hydrogen bonding (HB) has increased tremendously since the last two decades due to its capability to achieve the physical and chemical properties required for a display device and the other applications like spatial light modulators, optical switches, attenuators and beam splitters. The LC properties of a HB complex can be tuned by choosing the appropriate proton donor and acceptor moieties in different proportions. Supramolecular Hydrogen bonded Liquid Crystalline materials are prepared between two low molar mass non-mesogenic moieties in 1:1 molar ratio. Non-mesogenic proton acceptors with different chain lengths viz., (4-pyridyl)-benzylidene-4ʹ-n-alkyl anilines (PyBnA) (butyl, heptyl, decyl, dodecyl, tetradecyl and hexadecyl) are synthesized and characterized by 1H NMR and FTIR spectral methods. Different series of HB complexes between unsubstituted/substituted benzoic acids/aliphatic acids (proton donor) and PyBnAs are prepared and characterized. A systematic study on the structure property relationships of the different series are carried out by considering the nature, position, size and number of substituents on the induced mesomorphism. Also the effect of chain length of the proton acceptor on the induced mesomorphism is investigated. The mesomorphic thermal stabilities of the H-bonded complexes are compared with the similar reported supramolecular linear and non-linear H-bond complexes.

Item Type: Thesis (Phd. Thesis)
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 21 Jun 2017 08:48
Last Modified: 21 Jun 2017 08:48

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