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Amreli, India

Travadi J.J.,Kamani Science College | Vadodaria M.S.,Shree M And N Virani Science College | Ladva K.D.,Shree M And N Virani Science College | Doshi A.V.,Matushri Virbaima Mahila Science and Home Science College
Molecular Crystals and Liquid Crystals | Year: 2016

A novel cinnamate ester homologous series has been synthesized and studied with a view to understanding and establishing the effects of molecular structure on liquid crystal (LC) properties with a focus on the highly polar methoxy group as a lateral substituent. The series consists of twelve homologs; of which C1-C5 are nonmesogenic, and the rest of the homologs are enantiotropically smectogenic or and nematogenic. The texture of nematic phases is threaded or Schlieren and that of the smectic is either smectic A or C, as recognized and determined through an optical polarizing microscope equipped with a heating stage. The Sm-N I and N-I transition curves exhibit odd-even effects and behave in normalmanner. The Cr-IMbehaves in normalmanner. Analytical and spectral data confirm the molecular structures of homologs. The average thermal stabilities for smectic and nematic are 125.3 C and 129.8 C, respectively, whose total mesophase length varies from 13 C to 51 C. Some LC properties of present series are compared with the structurally similar known series. © 2016 Taylor & Francis Group, LLC.


Travadi J.J.,Kamani Science College | Vadodaria M.S.,Shree M And N Virani Science College | Ladva K.D.,Shree M And N Virani Science College | Doshi A.V.,Matushri Virbaima Mahila Science and Home Science College
Molecular Crystals and Liquid Crystals | Year: 2016

A novel homologous series of liquid crystal (LC) derivatives of general structure: RO·C6H4·COO·C6H3·OCH3(ortho)CH = CH·COO·(n)C5H11 was synthesized and studied with a view to understanding the effect of molecular structure on liquid crystal behavior with reference to lateral-OCH3 and terminal end group. Homologous series consists of 12 derivatives (C1-C16), the first five (C1-C5), and the last (C16) members are not liquid crystals and the rest of the homologs (C6-C14) are enantiotropically smectogenic without exhibition of the nematic phase. The textures of the smectic phases are focal conic fan shaped or batonets of smectic-A or smectic-C. Average thermal stability for smectic is 81.8°C and mesophase length ranges from 9°C to 31°C. Transition curves of a phase diagram (Sm-I and Cr-Sm/I) behave in a normal manner. The Sm-I transition curve exhibits an odd-even effect. Analytical and spectral data support the molecular structures. The series is smectogenic of a middle ordered melting type. LC properties of the present series are compared with structurally similar known homologous series. Transition temperatures were determined by an optical polarizing microscope equipped with a heating stage. © 2016 Taylor & Francis Group, LLC.


Vadodaria M.S.,Shree M & N Virani Science College | Ladva K.D.,Shree M & N Virani Science College | Doshi A.V.,Matushri Virbaima Mahila Science and Home Science College | Travadi J.J.,Kamani Science College
Molecular Crystals and Liquid Crystals | Year: 2016

Novel liquid crystal (LC) materials of ester derivatives were synthesized and studied with a view to understanding and establishing the effects of molecular structure on LC properties. The novel molecules consist of two phenyl rings bonded through-COO-central group and a laterally substituted methoxy group with-OCnH2n+1 as well as-COOCH3 terminal end groups, and yielded 12 homologous members of an ester series. The C1 to C3 members are nonmesomorphic, the C4 to C12 members are enantiotropic nematic only, and the C14 to C16 members are enantiotropically smectogenic in addition to nematogenic. Transition temperatures and the textures of LC state were observed through an optical polarizing microscope (POM) equipped with a heating stage. The textures of nematic phase are threaded or Schlieren, and that of smectic phase are focal conic of the type A or C. Transition curves of a phase diagram behave in normal manner with the exhibition of an odd-even effect (only N-I). Analytical and spectral data support the molecular structures of the novel ester derivatives. The LC properties of the present series are compared with structurally similar other known series. The average thermal stability of the series is 93°C for smectic and 120.88°C for nematic and the mesogenic phase length ranges between 2°C and 46°C. © 2016 Taylor and Francis Group, LLC.


Godhasra J.N.,Kamani Science College | Patel M.C.,Kamani Science College | Kansagara N.N.,Kamani Science College | Thanki B.P.,Kamani Science College | Shah V.R.,Kamani Science College
Journal of the Indian Chemical Society | Year: 2010

A series of 5-aryl-3-isopropyl-4-[N-phenyl-aminocarbonyl]-4,5-dihydro-1H- pyrazoles were synthesized by the reaction between 3-aryl-2-isobutanoyl-N- phenyl-acrylamide with hydrazine hydrate in acetic acid as solvent gives acetyl pyrazoline. All the compounds have been evaluated for their in vitro biological assay like antibacterial activity towards Gram-positive and Gram-negative bacterial strains and antifungal activity towards Aspergillus niger at a concentration of 40 μg. The biological activities of synthesized compounds were compared with standard drugs.

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