Novel Azopyridine-Containing Silver Mesogens:  Synthesis, Liquid-Crystalline, and Photophysical Properties

2002 ◽  
Vol 14 (6) ◽  
pp. 2687-2692 ◽  
Author(s):  
P. K. Sudhadevi Antharjanam ◽  
V. Ajay Mallia ◽  
Suresh Das
Keyword(s):  
Liquid Crystalline ◽  
Photophysical Properties

scholarly journals Synthesis and Characterization of Photoluminescence Liquid Crystals Based on Flexible Chain-Bearing Pentafluorinated Bistolanes

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 603
Author(s):  
Shigeyuki Yamada ◽  
Masaya Sato ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Oxygen Atom ◽  
Liquid Crystalline ◽  
Color Change ◽  
Photophysical Properties ◽  
Structure Property ◽  
Flexible Chain ◽  
Structure Property Relationships ◽  
Chiral Nematic

The liquid-crystalline (LC) and photophysical properties of molecules are very sensitive to their electronic and molecular aggregate structures. Herein, to shed light on the structure–property relationships of pentafluorinated bistolane-based photoluminescence (PL) liquid crystals (PLLCs) previously reported by our group, we synthesized pentafluorinated bistolanes with variable flexible chains and evaluated their LC and photophysical properties. The incorporation of an oxygen atom (to afford a 2-methoxyethoxy unit) or an oxygen atom and a methyl group (to afford a 1-methoxyprop-2-oxy unit) into the flexible butoxy chain significantly decreased the temperature of the crystalline-to-LC phase transition, and a chiral nematic phase comprising helical molecular aggregates was observed for the chiral 1-methoxyprop-2-oxy group–bearing bistolane. The synthesized bistolanes exhibited strong blue PL in both solution and crystalline phases; the featuring PL characteristics were maintained in the LC phase (produced by the crystalline-to-LC phase transition) except for a slight PL color change. Thus, it was concluded that the PL behavior of pentafluorinated bistolanes can be modulated by the choice of a suitable flexible chain, and the obtained insights are believed to facilitate the application of PLLCs in thermosensing PL materials.

Preparation and photophysical properties of monomeric liquid-crystalline azo-dyes embedded in bulk and film SiO2-sonogel glasses

2010 ◽  
Vol 56 (1) ◽  
pp. 7-18 ◽  
Author(s):  
V. Torres-Zúñiga ◽  
O. G. Morales-Saavedra ◽  
E. Rivera ◽  
R. Castañeda-Guzmán ◽  
J. G. Bañuelos ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Liquid Crystalline ◽  
Photophysical Properties

New phosphorescent platinum(ii) complexes: lamellar mesophase and mechanochromism

2016 ◽  
Vol 40 (12) ◽  
pp. 10371-10377 ◽  
Author(s):  
Hao Geng ◽  
Kaijun Luo ◽  
Guo Zou ◽  
Haifeng Wang ◽  
Hailiang Ni ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Photophysical Properties ◽  
Picolinic Acid ◽  
Auxiliary Ligand ◽  
Square Planar ◽  
Main Ligand

Several new square planar platinum(ii) complexes based on modified 2-phenylpyridine derivatives as the main ligand and picolinic acid as the auxiliary ligand were synthesized and their photophysical properties, and mechanochromic and liquid crystalline behavior were investigated.

scholarly journals Photophysical and Photochemical Properties of Green Fluorescent Liquid Crystalline Systems

2003 ◽  
Vol 58 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Ivo Grabchev ◽  
Jean-Marc Chovelon
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Liquid Crystalline ◽  
Photophysical Properties ◽  
Orientational Order ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Photochemical Properties ◽  
Green Fluorescent ◽  
Naphthalimide Dye

The photophysical properties of polymer-dispersed liquid crystal systems, containing naphthalimide dye as fluorescent units are reported. Investigations have been carried out on some 1,8- naphtalimide derivatives both in isotropic and anisotropic media, and their photophysal properties have been described. The orientational order parameters of the dyes in nematic liquid crystal ZLI 1840 have been determined. The photostability of the dye/liquid crystal systems has been investigated and the effect that the substituents in the naphthalimide structure have upon the orientation of the dye was discussed.

Fluorescent Hexacatenar Liquid Crystals

1999 ◽  
Vol 560 ◽  
Author(s):  
Ben Hoag ◽  
Douglas L. Gin ◽  
Udo Theissl ◽  
Egbert Zojer ◽  
Guenther Leising
Keyword(s):  
Liquid Crystals ◽  
Solid State ◽  
Emission Spectroscopy ◽  
Liquid Crystalline ◽  
Photophysical Properties ◽  
Optoelectronic Properties ◽  
Blue Luminescence ◽  
Photoluminescence Excitation ◽  
Site Selective

ABSTRACTA novel family of phasmidic liquid crystals incorporating an oligo(ρ-phenylenevinylene) core was produced. These compounds exhibit blue luminescence in both solution and the solid state. The emission profiles are influenced by the degree of organization in the solid state. The snthesis and liquid-crystalline behavior of these compounds will be discussed. Their photophysical properties, as studied by c.w. photoluminescence excitation, emission spectroscopy, and site selective spectroscopy, as well as their optoelectronic properties will be presented.

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