230306-50-0Relevant academic research and scientific papers
Alkoxy/halostyryl benzoic acids: Synthesis, crystal structure, and study of mesomorphic and photophysical properties
Muhammad, Khushi,Rauf, M. Khawar,Tahir, M. Nawaz,Hameed, Shahid
, p. 32 - 45 (2017/09/07)
Alkoxy/halostyrylbenzoic acids were synthesized and evaluated for their mesomorphic and photophysical properties. The trans geometry of the molecules was established by the presence of large coupling constants in 1H-NMR spectra and confirmed fu
Optical properties of thiophene-containing liquid crystalline and hybrid liquid crystalline materials
Romiszewski, Jerzy,Puterová-Tokarová, Zita,Mieczkowski, Jozef,Gorecka, Ewa
supporting information, p. 2927 - 2934 (2014/07/07)
We report new mesogens made of thiophene and stilbene moieties as main building blocks that exhibit nematic and/or smectic phases. The liquid crystalline properties of their thiophene/azobenzene analogues have been found to be strongly suppressed compared to their thiophene/stilbene analogues. In twinned "bent-core" thiophene/azobenzene compound relatively strong fluorescence was found. A new hybrid material built of AuNPs coated with a thiophene-containing mesogenic ligand that forms a smectic phase is shown. In solutions of thiophene-mesogen coated AuNPs an unusual decrease of the ligand fluorescence decay rate was observed. Fluorescence lifetime increase is ascribed to two-point anchoring of ligand molecules resulting in molecule orientation tangential to the AuNP surface. UV-Visible absorption and fluorescence data of all synthesised compounds are presented. the Partner Organisations 2014.
Synthesis and study of new rod-like mesogens containing 2-aminothiophene unit
Puterová, Zita,Romiszewski, Jerzy,Mieczkowski, Jozef,Gorecka, Ewa
experimental part, p. 8172 - 8180 (2012/09/22)
We present a synthesis and mesomorphic properties of a new series of rod-like mesogens. All the compounds possess a substituted 2-aminothiophene unit as a main element in the structure attached to a stilbene moiety with a terminal alkyloxy chain (OR1, OR2 where R 1=CnH2n+1, R2=CmH 2m+1; n, m ranging from 6 to 12). The synthesis of alkyloxybiphenyl substituted 2-aminothiophenes was carried out by the Gewald reaction and the appropriate reaction conditions were investigated. The liquid-crystalline properties were studied via polarizing optical microscopy, differential scanning calorimetry and X-ray diffraction. These materials exhibit nematic and/or smectic A phases. The influence of structural changes (variation in alkyloxy chain length and symmetry of the molecule) on mesogenic behaviour is discussed. Evaluation of UV-vis, fluorescent and electrochemical properties are also included.
Bent-shaped mesogens without an azomethine joint
Mieczkowski, Jozef,Szydlowska, Jadwiga,Matraszek, Joanna,Pociecha, Damian,Gorecka, Ewa,Donnio, Bertrand,Guillon, Daniel
, p. 3392 - 3399 (2007/10/03)
A new series of banana-shaped mesogens with ethylene links in the branches and laterally substituted are presented. They form B1, B6 B6 and B7-like phases. The B7-like and B2 phases are not
