129993-66-4Relevant articles and documents
Synthesis and characterization of banana-shaped mesogens derived from a benzophenone moiety
Majumdar,Chakravorty, Santanu,Sinha, Randhir Kumar,Pal, Nilasish
, p. 125 - 134 (2009)
A homologous series of Schiff's bases consisting of a benzophenone moiety as the central core has been synthesized. Schiff's bases were prepared starting from benzophenone by a sequence of reactions, viz., nitration followed by reduction and heating the r
Synthesis of new derivatives of 2,4-dihydroxybenzoic acid and aldehyde and the study of the spectral-luminescent properties of their lanthanide complexes
Derkach,Teslyuk,Novikova,Doga,Yarkova,Meshkova
, p. 1293 - 1298 (2014)
4-Acylated derivatives of 2,4-dihydroxybenzoic acid and aldehyde were synthesized. It was found that 2-hydroxy-4-[(4-decyloxy)benzoyloxy]benzaldehyde coordinates to Eu(III) ion, and when the aldehyde group is replaced by the carboxy group, a complex with Tb(III) ions is formed. The photoluminescent properties of the resulting complexes in solution were studied.
Metallomesogens with a manganese core
Barbera, Joaquin,Castel, Esther,Gimenez, Raquel,Marcos, Mercedes,Serrano, Jose Luis
, p. 89 - 99 (2001)
A series of compounds of the formula [MnCl(Ln)2] (L= N-alkyl[4-(4-decyloxybenzoyloxy)]salicylaldiminato) have been synthesized and their mesomorphic properties studied. These Mn(III) complexes display monotropic nematic phases when the number o
Benzimidazole based mesogenic Schiff-bases: Synthesis and characterization
Dubey, Ragini,Yerrasani, Rajasekhar,Karunakar,Singh, Angad Kumar,Gupta, Rupali,Ganesan, Vellaichamy,Rao
, p. 106 - 114 (2017/05/25)
Two homologous series of mesogenic Schiff-bases, N-4-((alkoxy)-(phenyl-3-hydroxy-4-(4-(5-methylbenzimidazol))-2-alkoxysalicylaldimine)benzoate (7a–d) and N-4′-(5-methyl-benzimidazole)-phenyl-4-alkoxysalicylaldimine (8a–d) incorporating benzimidazole moiety have been prepared and the molecular structures studied by FT-IR, NMR and ESI-MS spectrometry. Mesogenic behaviour was investigated by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and variable temperature powder X-ray diffraction (PXRD) techniques. Changing the spacer (ester-linked to non-ester linked) of the Schiff-base results in enhancement of thermal stability and phase transition temperature. The members of series-I show monotropic SmA while those of series-II reflect enantiotropic SmA mesomorphism. An electrochemical study of a representative Schiff base in each series (7d and 8c) showed an electrical band gap 1.26?eV and 1.22?eV respectively.
Stable ferroelectric liquid crystals derived from salicylaldimine-core
Veerabhadraswamy, Bhyranalyar N.,Rao, D. S. Shankar,Yelamaggad, Channabasaveshwar V.
, p. 4539 - 4551 (2015/04/14)
Five pairs of enantiomers derived from salicylaldimine-core have been prepared by condensing (R)- or (S)-4-(octan-2-yloxy)anilines with 4-formyl-3-hydroxyphenyl 4-(n-alkoxy)benzoates. They have been designed to probe the correlation between molecular structure and mesomorphism, and especially to provide stable mesogens having potential for applications in ferroelectric liquid crystal devices. Thus, they have been substituted with a chiral tail at one end and by n-alkoxy chains of varying length at the other terminal. A detailed study confirms an indistinguishable behavior of all ten mesogens exhibiting an enantiotropic chiral smectic C (SmC) phase besides blue phase (BP) and chiral nematic (N) phase. The SmC phase occurring over a 50-70 °C thermal width shows ferroelectric switching with spontaneous polarization (Ps) value crossing over 100 nC/cm2. Circular dichroism spectroscopic study of the mesophases confirms the chromophores of the molecules being in the macroscopic chiral (helical) environment.
