Optical and electrical switching of cholesteric liquid crystals containing azo dye

Oh, Seung-Won; Baek, Jong Min; Kim, Sang Hyeok; Yoon, Tae Hoon

doi:10.1039/c7ra01507k

Cited by 62 publications

(21 citation statements)

References 29 publications

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“…In our case, the complexes did not show photoisomerization behavior which means that the CPAT dye is bonded to the metal within complex structure. It is nice to point that the cis isomer backed totally at room temperature to trans isomer which means that the chromic behavior is intrinsic [27][28][29][30][31][32].…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Identification, and Biological Study for Some Complexes of Azo Dye Having Theophylline

Mohammed

2021

The Scientific World Journal

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This article includes the synthesis of heterocyclic azo dye of theophylline by coupling diazonium salt of 4-chloroaniline with theophylline which is, namely, 8-(1-(4-chlorophenyl)azo)theophylline (CPAT). The complexes of cobalt and nickel were prepared by reacting their ions with CPAT ligand in ethanol under 1 : 2 ratio metal-ligand. The CPAT ligand and its complexes were characterized by elemental analysis, infrared spectrometry, electronic absorption spectroscopy, molar conductivity, and magnetic moment. The cobalt and nickel complexes show octahedral geometry having general formula [M(CPAT)2Cl2]. This article addresses the properties of CPAT dye such as photochromic properties. The CPAT dye exhibited obvious and desired changes under irradiation with visible light (405 nm), high sensitive for pH changes which refer to its ability to be analysis indicator. CPAT dye exhibited solvatochromic properties presenting red shift with polar solvent. The CPAT and its complexes show interesting antibiological activities towards Staph. aureus and E. coli bacteria and Aspergillus fungi.

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Section: Resultsmentioning

confidence: 99%

Synthesis, Identification, and Biological Study for Some Complexes of Azo Dye Having Theophylline

Mohammed

2021

The Scientific World Journal

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“…As the number of pitches is increased, the specular transmittance decreases and the haze gradually increases. When the number of pitches is greater than 4, the chiral torque is strong enough to overcome homeotropic surface anchoring, and the focal conic state can be observed [9][10][11][12].…”

Section: Resultsmentioning

confidence: 99%

43‐4: Self‐Shading with Optically‐ and Thermally‐Switchable Liquid Crystals

Kim

Baek

et al. 2018

Symp Digest of Tech Papers

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Self-shading by optical or thermal switching between transparent and opaque states is achieved by liquid crystals doped with push-pull azobenzene and can be used for energysaving smart windows. The self-shading light shutter is transparent during cool weather or under weak sunlight, which could save the energy used for heating and lighting, and can be switched from the transparent to opaque states during warm weather or under strong sunlight, saving energy used for cooling.

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“…Photo-responsive liquid crystals (LCs) can switch among the smectic A (SmA), nematic (N), and isotropic (I) phases in response to the incident light [8][9][10][11]. As a smart window, their transmittance can be controlled with UV and visible light sources.…”

Section: Introductionmentioning

confidence: 99%

16.1: Invited Paper: Self‐Regulating Liquid Crystal Windows for Energy Saving

Kim

Yoon

2021

Symp Digest of Tech Papers

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Optical and electrical switching of cholesteric liquid crystals containing azo dye

Abstract: We propose an optically and electrically switchable cholesteric liquid crystal (ChLC) cell doped with a push–pull azo dye.

Cited by 62 publications

References 29 publications

Synthesis, Identification, and Biological Study for Some Complexes of Azo Dye Having Theophylline

Synthesis, Identification, and Biological Study for Some Complexes of Azo Dye Having Theophylline

43‐4: Self‐Shading with Optically‐ and Thermally‐Switchable Liquid Crystals

16.1: Invited Paper: Self‐Regulating Liquid Crystal Windows for Energy Saving

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