111772-61-3Relevant academic research and scientific papers
Fluorescent unsymmetrical four-ring bent-core mesogens: 2D modulated phases
Deb, Rahul,Laskar, Atiqur Rahman,Sarkar, Dipika Debnath,Mohiuddin, Golam,Chakraborty, Nirmalangshu,Ghosh, Sharmistha,Shankar Rao,Rao, Nandiraju V. S.
, p. 10510 - 10521 (2013)
Based on the chemical incompatibility between the aromatic mesogenic cores and the flexible end aliphatic (methylene units) chains, which can lead to the formation of polarization modulated layered undulated phases, four-ring bent-core compounds have been designed and synthesized. The designed compounds are thermally and hydrolytically stable due to intramolecular hydrogen bonding, highly fluorescent and exhibit 2D-polarization modulated layer undulated (PMLU) smectic phases. The phase transition temperatures have been confirmed by differential scanning calorimetry and the phases are confirmed by polarizing optical microscopy and X-ray diffraction studies. For compounds 1-10-11 and 1-15-11 the peaks are indexed to tilted columnar lattice (Colob), while for 2-12-11 the peaks are indexed to the rectangular lattice belonging to the PMLU family The influence of the direction of ester linking group played an important role in the mesophase as well as the evaluated parameters of the dipole moment, the bending angle and the asymmetry parameter by spin-restricted DFT calculations using the B3LYP exchange-correlation functional and the 6-311G(d,p) basis set.
Photochromism of Salycilideneanilines Incorporated in a Langmuir-Blodgett Multilayer
Kawamura, Shinichi,Tsutsui, Tetsuo,Saito, Shogo,Murao, Yuko,Kina, Kenyu
, p. 509 - 511 (1988)
The photochromic behavior of an amphiphilic salicylideneaniline derivative, N-(4-dodecoxysalicylidene)-4-carboxyaniline (DSA), incorporated in a Langmuir-Blodgett film was studied.DSA formed a stable and condensed monolayer at an air-water interface, and the monolayer was transferred on quartz substrates.The built-up multilayer was found to possess a highly ordered and densely packed structure.Reversible photochromism of a salicylideneaniline group was observed in built-up DSA films on repeating irradiation with UV light.The rate of the thermal decoloration was proved to be suppressed by the ordered molecular environment in the multilayer.
Origin of green photoluminescence in four-ring bent-core molecules with ESIPT, selective sensing of zinc ions by turn-on emission and their liquid crystal properties
Gude, Venkatesh,Rout, Duttanjali,Panigrahi, Mruganka Kumar,Biradha, Kumar
, p. 1386 - 1395 (2018/10/21)
Fluorescent four-ring symmetrical/unsymmetrical molecules containing alkyl chains of a varied number of-CH2-groups with a bent-core have been synthesized to explore their liquid crystalline (LC) and photophysical properties. Some of these molecules depending upon their alkyl chain length were found to exhibit B1 and B7 liquid crystalline phases and are characterized by various analytical techniques such as FT-IR,1H NMR, mass, POM, DSC, single crystal XRD, etc. Crystal structure determination reveals the hydrogen bonded enol form of these molecules with non-planar bent-molecular geometry. Intramolecular hydrogen bonding was found to play an important role in the stabilization of these molecules and in the origin of their green photoluminescence (GPL). The photo-physical experimental results through various control experiments clearly demonstrate that the origin of the large Stokes shifted GPL of these molecules can be attributed to the excited state intramolecular proton transfer (ESIPT) process. The formation of various types of anionic species and their stability were explored through steady-state and time-resolved fluorescence measurements. These compounds are found to be good turn-on PL probes in the selective detection of zinc ions at the micromolar level. Upon binding of zinc ions with the bent-core molecule, the structural changes have been investigated through NMR spectroscopy.
A novel family of salicylaldimine-based five-ring symmetric and non-symmetric banana-shaped mesogens derived from laterally substituted resorcinol: Synthesis and characterization
Yelamaggad, Channabasaveshwar V.,Mathews, Manoj,Nagamani, S. Anitha,Rao, Doddamane S. Shankar,Prasad, Subbarao Krishna,Findeisen, Sonja,Weissflog, Wolfgang
, p. 284 - 298 (2008/02/01)
We present the results of our extensive investigations into the phase behavior of several "robust" five-ring banana-shaped compounds. Six homologous series of either symmetric or non-symmetric bent-core molecules, comprising a laterally substituted 1,3-phenylene ring as the central unit covalently linked to thermally and hydrolytically stable rod-like salicylaldimine segments have been synthesized and evaluated for their mesomorphism. The mesophases have been characterized by optical, calorimetric, X-ray diffraction and electro-optical studies. With a methyl group, polarizable chlorine atom or the more polarizable nitro group as the lateral substituent(s) and terminal alkoxy tails of varying length, the structure-property correlation has been determined. Our study clearly demonstrates that these materials, as predicted, display a different behavior compared to the corresponding compounds without the lateral substituents. The phase behavior shows a critical dependence on the nature and position of the lateral substituent(s). The study includes a comparison with the phase behavior of some of the other types of banana-shaped compounds. The Royal Society of Chemistry 2007.
