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Katariya KD, Nakum KJ, Soni H, Nada S, Hagar M. Imine Based Four-Ring Chalcone-Ester Liquid Crystals: Synthesis, Characterization, Mesomorphic Behaviour and DFT approach. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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2
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Çağlar FP, Akdaş-Kılıç H, Ocak H, Eran BB. Chiral polymorphism in new imine based rod-like liquid crystals. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128755] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Karanlık G, Ocak H, Bilgin Eran B. Imine based chiral liquid crystals: Effect of varying the terminal substituent and orientation of ester linking unit. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.11.102] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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4
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Huang CC, Huang YC, Hsieh WC, Chen YJ, Jiang SK, Chen BH, Hsu IJ, Lee JJ. The effects of molecular structure and functional group of a rodlike Schiff base mesogen on blue phase stabilization in a chiral system. NEW J CHEM 2019. [DOI: 10.1039/c8nj04493g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A wider blue phase (BP) range can be induced easily when two difluoro substituted and racemic rodlike Schiff base mesogens are doped with the appropriate concentration of chiral dopants S811 or ISO(6OBA)2.
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Affiliation(s)
| | - Yu-Chang Huang
- Department of Chemical Engineering, Tatung University
- Taipei 104
- Taiwan
| | - Wei-Cheng Hsieh
- Department of Chemical Engineering, Tatung University
- Taipei 104
- Taiwan
| | - Yen-Jung Chen
- Department of Chemical Engineering, Tatung University
- Taipei 104
- Taiwan
| | - Shi-Kai Jiang
- Department of Chemical Engineering, Tatung University
- Taipei 104
- Taiwan
| | - Bo-Hao Chen
- Department of Molecular Science and Engineering, National Taipei University of Technology
- Taipei 106
- Taiwan
- National Synchrotron Radiation Research Center
- Hsinchu 300
| | - I.-Jui Hsu
- Department of Molecular Science and Engineering, National Taipei University of Technology
- Taipei 106
- Taiwan
- Research and Development Center for Smart Textile Technology, National Taipei University of Technology
- Taipei 106
| | - Jey-Jau Lee
- National Synchrotron Radiation Research Center
- Hsinchu 300
- Taiwan
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5
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Nayak RA, Bhat SA, Shanker G, Rao DSS, Yelamaggad CV. Highly frustrated liquid crystal phases in optically active dimers: synthesis and rich phase transitional behavior. NEW J CHEM 2019. [DOI: 10.1039/c8nj03520b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New cholesterol-based Schiff base dimers exhibit a rich mesomorphism.
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Affiliation(s)
- Rashmi Ashwathama Nayak
- Centre for Nano and Soft Matter Sciences
- P. B. No. 1329
- Prof. U. R. Rao Road
- Jalahalli
- Bengaluru 560013
| | - Sachin A. Bhat
- Centre for Nano and Soft Matter Sciences
- P. B. No. 1329
- Prof. U. R. Rao Road
- Jalahalli
- Bengaluru 560013
| | - G. Shanker
- Department of Chemistry
- Jnana Bharathi Campus
- Sneha Bhavan
- Bangalore University
- Bengaluru
| | - D. S. Shankar Rao
- Centre for Nano and Soft Matter Sciences
- P. B. No. 1329
- Prof. U. R. Rao Road
- Jalahalli
- Bengaluru 560013
| | - C. V. Yelamaggad
- Centre for Nano and Soft Matter Sciences
- P. B. No. 1329
- Prof. U. R. Rao Road
- Jalahalli
- Bengaluru 560013
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6
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Sharma VS, Singh HK, Sharma AS, Shah AP, Shah PA. Bowl-shaped fluorescent liquid crystals derived from 4-tert butyl calix[4]arene and trans cinnamic acid derivatives. NEW J CHEM 2019. [DOI: 10.1039/c9nj03097b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new family of bowl-shaped molecules with a calix[4]arene rigid core appended by four-side and two-side substitution with trans 4-n-alkoxy cinnamic acid has been synthesized and well characterized.
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Affiliation(s)
- Vinay S. Sharma
- Department of Chemistry
- Faculty of Basic and Applied Science
- Madhav University
- Sirohi
- India
| | - Hemant Kumar Singh
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati-781039
- India
| | - Anuj S. Sharma
- Department of Chemistry, School of Science, Gujarat University
- Ahmedabad
- India
| | | | - Priyanka A. Shah
- Department of Chemistry, School of Science, Gujarat University
- Ahmedabad
- India
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7
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Veerabhadraswamy BN, Rao DSS, Yelamaggad CV. Ferroelectric Liquid Crystals: Synthesis and Thermal Behavior of Optically Active, Three-Ring Schiff Bases and Salicylaldimines. Chem Asian J 2018; 13:1012-1023. [PMID: 29427467 DOI: 10.1002/asia.201800119] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Indexed: 11/10/2022]
Abstract
The chiral ferroelectric smectic C (SmC*) phase, characterized by a helical superstructure, has been well exploited in developing high-resolution microdisplays that have been effectively employed in the fabrication of a wide varieties of portable devices. Although, an overwhelming number of optically active (chiral) liquid crystals (LCs) exhibiting a SmC* phase have been designed and synthesized, the search for new systems continues so as to realize mesogens capable of meeting technical necessities and specifications for their end-use. In continuation of our research work in this direction, herein we report the design, synthesis, and thermal behavior of twenty new optically active, three-ring calamitic LCs belonging to four series. The first two series comprise five pairs of enantiomeric Schiff bases whereas the other two series are composed of five pairs of enantiomeric salicylaldimines. In each pair of optical isomers, the configuration of a chiral center in one stereoisomer is opposite to that of the analogous center in the other isomer as they are derived from (3 S)-3,7-dimethyloctyloxy and (3 R)-3,7-dimethyloctyloxy tails. To probe the structure-property correlations in each series, the length of the n-alkoxy tail situated at the other end of the mesogens has been varied from n-octyloxy to n-dodecyloxy. The measurement of optical activity of these chiral mesogens was carried out by recording their specific rotations. As expected, enantiomers rotate plane polarized light in the opposite direction but by the same magnitude. The thermal behavior of the compounds was established by using a combination of optical polarizing microscopy, differential scanning calorimetry, and powder X-ray diffraction. These complementary techniques demonstrate the existence of the expected, thermodynamically stable, chiral smectic C (SmC*) LC phase besides blue phase I/II (BPI or BPII) and chiral nematic (N*) phase. However, as noted in our previous analogous study, the vast majority of the Schiff bases show an additional metastable, unfamiliar smectic (SmX) phase just below the SmC* phase. Notably, the SmC* phase persists over the temperature range ≈80-115 °C. Two mesogens chosen each from Schiff bases and salicylaldimines were investigated for their electrical switching behavior. The study reveals the ferroelectric switching characteristics of the SmC* phase featuring the spontaneous polarization (PS ) in the range 69-96 nC cm-2 . The helical twist sense of the SmC* phase as well as the N* phase formed by a pair of enantiomeric Schiff bases and salicylaldimines has been established with the help of circular dichroism (CD) spectroscopic technique. As expected, the SmC* and the N* phase of a pair of enantiomers showed mirror image CD signals. Most importantly, the reversal of helical handedness from left to right and vice versa has been evidenced during the N* to SmC* phase transition, implying that the screw sense of the helical array of the N* phase and the SmC* phase of an enantiomer is opposite.
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Affiliation(s)
| | - Doddamane S Shankar Rao
- Centre for Nano and Soft Matter Sciences, P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli, Bengaluru, 560013, India
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8
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Huang CC, Wu ZY, Sie BH, Chou WH, Huang YC, Yu MC, Chen BH, Hsu IJ, Wu LC, Lee JJ. Effect of the Functional Groups of Racemic Rodlike Schiff Base Mesogens on the Stabilization of Blue Phase in Binary Mixture Systems. J Phys Chem B 2016; 120:12736-12754. [PMID: 27973846 DOI: 10.1021/acs.jpcb.6b09823] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Four series of rodlike racemic Schiff base mesogens possessing different alkyl chains and two types of linkages, ester and alkynyl linkages, were synthesized and applied to induce cubic blue phases (BPs) in simple binary mixture systems. The mesophases of these Schiff base mesogens were confirmed by variable-temperature X-ray diffraction and the characteristic texture from polarized optical microscopy (POM). In general, when chiral additive S-(+)-2-octyl 4-(4-hexyloxybenzoyloxy)benzoate (S811; 20-40 wt %) is added into the rodlike racemic salicylaldimine-based mesogens, the cubic BPs could be observed and its temperature range is larger than 20 K. The widest temperature range of the cubic BP (35 K) can be observed in the blending mixture composed of rodlike racemic salicylaldimine-based mesogen OH-TIn possessing alkynyl linkage and 35-40 wt % S811. However, Schiff base mesogens possessing alkynyl linkage show a direct isotropic to chiral nematic transition when equal amount of chiral dopant is added. Notably, the termination temperature of BPs is very close to room temperature (ca. 35 °C) after 40.0 wt % S811 is added into the salicylaldimine-based mesogens possessing terminal alkyl chains and ester linkage. Interestingly, wide BPs (>30 K) can also be induced by adding chiral additive 1,4:3,6-dianhydro-2,5-bis[4-(n-hexyl-1-oxy)benzoic acid]sorbitol (ISO(6OBA)2) with a high helical twisting power into the racemic Schiff base mesogen possessing ester linkage. Cubic BPI and BPII can be confirmed by reflectance spectra and POM. The results of reflectance spectra indicate that the binary mixture composed of salicylaldimine-based mesogens and S811 easily exhibits a supercooling effect and induces BPI. However, only BPII can be observed in all binary mixtures containing Schiff base mesogens. On the basis of our experimental results and molecular modeling, we suppose that the values of biaxiality, polarizability, and the dipole moment of molecular geometry are the main factors that affect BP stabilization.
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Affiliation(s)
- Chiung-Cheng Huang
- Department of Chemical Engineering, Tatung University , Taipei 104, Taiwan
| | - Zong-Ye Wu
- Department of Chemical Engineering, Tatung University , Taipei 104, Taiwan
| | - Bing-Han Sie
- Department of Chemical Engineering, Tatung University , Taipei 104, Taiwan
| | - We-Hao Chou
- Department of Chemical Engineering, Tatung University , Taipei 104, Taiwan
| | - Yu-Chang Huang
- Department of Chemical Engineering, Tatung University , Taipei 104, Taiwan
| | - Mei-Ching Yu
- Department of Chemical Engineering, Tatung University , Taipei 104, Taiwan
| | - Bo-Hao Chen
- Department of Molecular Science and Engineering, National Taipei University of Technology , Taipei 106, Taiwan
| | - I-Jui Hsu
- Department of Molecular Science and Engineering, National Taipei University of Technology , Taipei 106, Taiwan
| | - Lai-Chin Wu
- National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan
| | - Jey-Jau Lee
- National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan
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Padmini V, Babu PN, Nair GG, Rao DSS, Yelamaggad CV. Optically Biaxial, Re-entrant and Frustrated Mesophases in Chiral, Non-symmetric Liquid Crystal Dimers and Binary Mixtures. Chem Asian J 2016; 11:2897-2910. [DOI: 10.1002/asia.201600918] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Vediappen Padmini
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
- Department of Organic Chemistry; School of Chemistry, Madurai Kamaraj University; Madurai 625021, Tamil Nadu India
| | - Palakurthy Nani Babu
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
| | - Geetha G. Nair
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
| | - D. S. Shankar Rao
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
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Kolokolov FA, Kulyasov AN, Magomadova MA, Shapieva KK, Mikhailov IE, Dushenko GA, Panyushkin VA. Synthesis and luminescent properties of coordination compounds of europium(III), gadolinium(III), and terbium(III) with para-alkyloxybenzoic acids. RUSS J GEN CHEM+ 2016. [DOI: 10.1134/s1070363216050418] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Yao B, Cong Y, Zhang B. Fluorescent chiral fluorinated liquid crystalline polymers containing rare earth complexes. NEW J CHEM 2016. [DOI: 10.1039/c5nj03065j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral liquid-crystalline polymers with lanthanide complexes distributed in helical matrices can emit soft red or green light when being excited.
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Affiliation(s)
- Bing Yao
- Research Centre for Molecular Science and Engineering
- Northeastern University
- Shenyang
- P. R. China
| | - Yuehua Cong
- Research Centre for Molecular Science and Engineering
- Northeastern University
- Shenyang
- P. R. China
| | - Baoyan Zhang
- Research Centre for Molecular Science and Engineering
- Northeastern University
- Shenyang
- P. R. China
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