Dynamiclly Functional Materials Based on Hydrogen-Bonded Liquid Crystals

A new series of supramolecular hydrogen-bonded liquid cryatals complexes were synthesized based on pyridine derivative and 4-n-alkoxybenzoic acids. The formation of hydrogen bonds was verified by infrared spectra. The thermal behavior of supramolecular liquid crystals was studied using differential scanning calorimeter (DSC). The liquid crystal texture was revealed with polarizing optical microscope (POM). It demonstrats that all supramolecular complexes have good liquid crystal properties.

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Synthesis and Liquid Crystal Properties of Supramolecular Side-Chain Liquid-Crystalline Polymers Containing Poly(acrylic acid) Intermolecular Hydrogen Bonds

Molecular Crystals and Liquid Crystals ◽

10.1080/15421406.2014.889531 ◽

2015 ◽

Vol 606 (1) ◽

pp. 1-11 ◽

Cited By ~ 7

Author(s):

P. Kandasamy ◽

R. Keerthiga ◽

S. Vijayalakshmi ◽

T. Kaliyappan

Keyword(s):

Liquid Crystal ◽

Hydrogen Bonds ◽

Acrylic Acid ◽

Liquid Crystalline ◽

Liquid Crystalline Polymers ◽

Side Chain ◽

Intermolecular Hydrogen Bonds ◽

Crystalline Polymers ◽

Crystal Properties ◽

Poly Acrylic Acid

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Effect of hydrogen-bonded supramolecular assembling on liquid crystal properties of imidazole-containing azomethines and their chelates with copper(II)

Supramolecular Chemistry ◽

10.1080/10610270802709386 ◽

2010 ◽

Vol 22 (1) ◽

pp. 1-12 ◽

Cited By ~ 2

Author(s):

Oleg N. Kadkin ◽

Jigeon Tae ◽

Eun Ho Kim ◽

So Yeon Kim ◽

Moon-Gun Choi

Keyword(s):

Liquid Crystal ◽

Crystal Properties ◽

Hydrogen Bonded

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Crystal structures of hydrogen-bonded co-crystals as liquid crystal precursors: 4-(n-pentyloxy)benzoic acid–(E)-1,2-bis(pyridin-4-yl)ethene (2/1) and 4-(n-hexyloxy)benzoic acid–(E)-1,2-bis(pyridin-4-yl)ethene (2/1)

Acta Crystallographica Section E Crystallographic Communications ◽

10.1107/s2056989016017655 ◽

2016 ◽

Vol 72 (12) ◽

pp. 1771-1775

Author(s):

Yohei Tabuchi ◽

Kazuma Gotoh ◽

Hiroyuki Ishida

Keyword(s):

Liquid Crystal ◽

Hydrogen Bonds ◽

Benzoic Acid ◽

Crystal Structures ◽

Acid Molecule ◽

Asymmetric Unit ◽

Average Structure ◽

Π Interactions ◽

Acid And Base ◽

Hydrogen Bonded

The crystal structures of title hydrogen-bonded co-crystals, 2C12H16O3·C12H10N2, (I), and 2C13H18O3·C12H10N2, (II), have been determined at 93 K. In (I), the asymmetric unit consists of one 4-(n-pentyloxy)benzoic acid molecule and one half-molecule of (E)-1,2-bis(pyridin-4-yl)ethene, which lies about an inversion centre. The asymmetric unit of (II) comprises two crystallographically independent 4-(n-hexyloxy)benzoic acid molecules and one 1,2-bis(pyridin-4-yl)ethene molecule. In each crystal, the acid and base components are linked by O—H...N hydrogen bonds, forming a linear hydrogen-bonded 2:1 unit of the acid and the base. The 2:1 units are linkedviaC—H...π and π–π interactions [centroid–centroid distances of 3.661 (2) and 3.909 (2) Å for (I), and 3.546 (2)–3.725 (4) Å for (II)], forming column structures. In (II), the base molecule is orientationally disordered over two sets of sites approximately around the N...N molecular axis, with an occupancy ratio of 0.647 (4):0.353 (4), and the average structure of the 2:1 unit adopts nearly pseudo-C2symmetry. Both compounds show liquid-crystal behaviour.

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Design, Synthesis and Characterization of Hydrogen Bonded Binary Liquid Crystal Complex from 4-Methoxycinnamic Acid and 4-Hexyloxybenzoic Acid (4MCA:6OBA)

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2016-0955 ◽

2017 ◽

Vol 231 (11-12) ◽

Cited By ~ 3

Author(s):

Thamilarasan Ranjeeth Kumar ◽

Sankaran Sundaram ◽

Thangaiyan Chitravel ◽

Ramasamy Jayaprakasam ◽

Vellalapalayam Nallagounder Vijayakumar

Keyword(s):

Liquid Crystal ◽

Binary Mixture ◽

Tilt Angle ◽

Phase Variation ◽

Optical Microscope ◽

Scanning Calorimetry ◽

Smectic C ◽

Ir Studies ◽

Methoxycinnamic Acid ◽

Hydrogen Bonded

AbstractHydrogen bonded liquid crystal (HBLC) binary mixture has been synthesized from mesogenic 4-methoxycinnamic acid (4MCA) and mesogenic 4-hexyloxybenzoic acid (6OBA) with different mole ratio. The mesomorphic phase behavior and corresponding phase transition temperatures along with the enthalpy values were investigated by differential scanning calorimetry (DSC). The characteristic textures of 4MCA+6OBA binary mixture were observed by using polarizing optical microscope (POM). Fourier transform infrared spectroscopic (FT-IR) studies confirm the formation of hydrogen bond in the present binary mixture. A note worthy observation in this complex is that pure mesogens have no smectic phase where as 4MCA+6OBA binary mixture exhibits a nematic phase along with higher order smectic C (Sm C) phase. Variation of mole ratio influences thermal properties such as phase peak, enthalpy values and thermal span width of the present HBLC binary mixture complex. The optical tilt angle of 4MCA+6OBA for smectic C phase and thermal stability factors have been investigated. Optical tilt angle for smectic C phase is determined and same is fitted to a power law.

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Applications of Natural Purple from Dolabella auricularia: Colouration of Cholesteric Liquid Crystals

International Letters of Natural Sciences ◽

10.18052/www.scipress.com/ilns.50.1 ◽

2016 ◽

Vol 50 ◽

pp. 1-6

Author(s):

Yuki Kudo ◽

Hiromasa Goto

Keyword(s):

Liquid Crystal ◽

Liquid Crystals ◽

Cholesteric Liquid Crystal ◽

Optical Microscope ◽

Hydroxypropyl Cellulose ◽

Cholesteric Liquid Crystals ◽

Optical Texture ◽

Sea Hare ◽

Crystal Mixture

Hydroxypropyl cellulose (HPC) as a cholesteric liquid crystal was coloured with purple ink from Dolabella auricularia as a sea hare. Optical texture of the liquid crystal mixture was confirmed with a polarising optical microscope.

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