- Design and characterization of novel bis-benzamide liquid crystalline materials
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A new homologous series of symmetric, bent-shaped bis-benzamide dimers have been prepared. Several 1,n-bis(p-aminophenoxy)alkanes (n = 3, 5, 9,10,11) were employed as spacers and p-hexyloxy tails have been synthesized and appended to the spacers by amide linking groups. Different important parameters were explored using computational analysis by semi empirical method. The experimental results were correlated with theoretical studies and relationship between molecular structure and mesogenic behavior has been established. The mesomorphic properties of the resultant dimers were characterized by differential scanning calorimetry (DSC) and polarized optical microscopy (POM) equipped with a hot stage. Change in mesomorphic properties with change of methylene spacers was observed. Enantiotropic mesogenic behavior was exhibited by D3A6, D10A6 and D11A6 and the needle like and blurred schleiren textures were observed. It was observed that increased methylene spacers chain length decreased the melting temperatures. Thermogravimetric analysis revealed the thermal stability of dimers upto 360 °C.
- Iqbal, Asma,Siddiqi, Humaira Masood,Akhter, Zareen,Qaiser Fatmi, Muhammad
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p. 135 - 141
(2017/09/23)
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- The effect of even-odd methylene spacer groups on the thermal stability of epoxy-amine polymers
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A series of some novel epoxy-amine polymers was successfully synthesized by using DGEBA and aromatic diamines as starting materials. The cured free standing flexible polymer films were characterized by FTIR, DSC, TGA, and WAXD. The values of Tg
- Shakil, Maria,Akhter, Toheed,Siddiqi, Humaira Masood,Akhtar, Zareen
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- Thermal and mechanical properties of azomethine functionalized cyanate ester/epoxy blends
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A series of azomethine functionalized diols were synthesized by the condensation reaction of aromatic diamines with 4-hydroxy benzaldehyde. Aromatic diamines with different alkyl chain lengths have been used to prepare the bisphenols. These bisphenols wer
- Sakthidharan,Sundararajan,Sarojadevi
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p. 19666 - 19674
(2015/05/12)
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- A natural product inspired hybrid approach towards the synthesis of novel pentamidine based scaffolds as potential anti-parasitic agents
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A natural product inspired molecular hybridization approach led us to a series of novel pentamidine based pyrimidine and chalcone scaffolds. All the hybrids were evaluated for their anti-leishmanial potential. Most of the screened compounds have showed significant in vitro anti-leishmanial activity with less cytotoxicity in comparison to the standard drugs (pentamidine, sodium stibogluconate, and miltefosine). Additionally, anti-malarial screening of these compounds was also done and four compounds have shown superior activity against chloroquine resistance strain (K1) of Plasmodium falciparum.
- Tyagi, Vikas,Khan, Shahnawaz,Shivahare, Rahul,Srivastava, Khushboo,Gupta, Suman,Kidwai, Saqib,Srivastava, Kumkum,Puri,Chauhan, Prem M.S.
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supporting information
p. 291 - 296
(2013/02/23)
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- Chiral liquid crystal tetramers
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The synthesis and characterisation of two new series of liquid crystal tetramers in which four mesogenic groups are linked via three alkyl spacers is reported. In each series the length of the outer two spacers, n, is varied between 3, 4, 5, 7, 10 and 11
- Donaldson, Toby,Henderson, Peter A.,Achard, Marie France,Imrie, Corrie T.
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p. 10935 - 10941
(2012/04/23)
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- Alkylated urea and triaminotriazine compounds and phase change inks containing same
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Disclosed are compounds of the formulae wherein Z is a group of the formula —OR1, a group of the formula —SR1, or a group of the formula —NR1R2, Y is a group of the formula —OR3, a group of the formul
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- Highly non-linear liquid crystal tetramers
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Three new homologous series of liquid crystal tetramers in which four mesogenic groups are linked via three alkyl spacers have been synthesised and characterised. In each series the length of the outer two spacers, n, is varied from 3 to 12 methylene unit
- Henderson,Inkster,Seddon,Imrie
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p. 2722 - 2731
(2007/10/03)
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- Design, synthesis, and pharmacological evaluation of conformationally constrained analogues of N,N'-diaryl- and N-aryl-N-aralkylguanidines as potent inhibitors of neuronal Na+ channels
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In the present investigation, the rationale for the design, synthesis, and biological evaluation of potent inhibitors of neuronal Na+ channels is described. N,N'-Diaryl- and N-aryl-Naralkylguanidine templates were locked in conformations mimick
- Maillard, Michel C.,Perlman, Michael E.,Amitay, Oved,Baxter, Deborah,Berlove, David,Connaughton, Sonia,Fischer, James B.,Guo, Jun Qing,Hu, Lain-Yen,McBurney, Robert N.,Nagy, Peter I.,Subbarao, Katragadda,Yost, Elizabeth A.,Zhang, Lu,Durant, Graham J.
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p. 3048 - 3061
(2007/10/03)
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- Biological properties of amidinium sulfinic and sulfonic acid derivatives: inhibition of glycolytic enzymes of Trypanosoma brucei and protective effect on cell growth
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The activity of the title compounds has been investigated on two biological targets: cultures of trypanosome and glycolytic enzymes inhibition of the parasite, and on retinal epithelium cells.In both cases, these compounds exhibit a significant activity,
- Willson, M,Perie, JJ,Malecaze, F,Opperdoes, F,Callens, M
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p. 799 - 808
(2007/10/02)
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- Synthesis and Characterization of New Polymers Exhibiting Large Optical Nonlinearities. 3. Rigid-Rod/Flexible-Chain Copolymers
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As part of a continuing exploration of organic and organometallic polymers as nonlinear optical materials, a new copolymer with triphenodioxazine rigid-rod and aliphatic flexible-chain segments has been synthesized.This copolymer exhibits improved process
- Yu, Luping,Dalton, Larry R.
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p. 8699 - 8702
(2007/10/02)
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- Novel Bis as Antitrypanosomal Agents
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A series of novel 1,1'-(4,1-phenylene)bis was prepared and evaluated for activity against Trypanosoma rhodesiense in mice.The importance of the bis structure and the nature of the spacer between the two phenyl rings for optimal activity have been revealed.The potent parenteral activity of several analogues within this series as well as preliminary indication of oral activity lends encouragement to further development of this structural class.
- Turner, William R.,Werbel, Leslie M.
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p. 1728 - 1740
(2007/10/02)
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- MESOGENIC POLYMERS. 6. TWO SERIES OF ISOMERIC POLYAZOMETHINES.
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Two homologoous series of alternating rigid-flexible, main chain liquid crystalline polyimines are reported; one based on terephthaldehyde the other based on p-phenylenediamine. It was found through examination of optical microscopic, x-ray diffraction an
- Griffin,Britt,Hung,Steele
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p. 305 - 314
(2007/10/02)
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- Poly(6-oxy-2,2,4-trialkyl-1,2-dihydroquinoline)alkylene compounds as antidegradants for rubber
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Vulcanizable or vulcanized diene elastomers containing stabilizing amounts of certain poly(6-oxy-2,2,4-trialkyl-1,2-dihydroquinoline)alkylene antidegradants show resistance to ozone attack. The antidegradants themselves are novel compounds.
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