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Book Synthesis and Characterization of New Liquid Crystalline Compounds Containing Azobenzene and Bisazobenzene Moieties

Download or read book Synthesis and Characterization of New Liquid Crystalline Compounds Containing Azobenzene and Bisazobenzene Moieties written by Abdulsalam Abubakar Salisu and published by . This book was released on 2009 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Synthesis and Characterization of Bent shaped Liquid Crystal with Azobenzene Having Phenylbenzoate Linkage

Download or read book Synthesis and Characterization of Bent shaped Liquid Crystal with Azobenzene Having Phenylbenzoate Linkage written by Indhumathi Sivanesan and published by . This book was released on 2008 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Synthesis and Characterization of Rod shaped Liquid Crystalline Monomers Containing Azobenzene as Mesogenic Cores

Download or read book Synthesis and Characterization of Rod shaped Liquid Crystalline Monomers Containing Azobenzene as Mesogenic Cores written by Khye Ning Wong and published by . This book was released on 2009 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Synthesis and Characterization of Bent shaped Liquid Crystal

Download or read book Synthesis and Characterization of Bent shaped Liquid Crystal written by Kala a/p Shanku Pillay and published by . This book was released on 2006 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of liquid crystal is relatively new area of chemistry, and therefore generates a large frontier of research. The ability of being able to produce high resolution display screens for use in televisions or laptop computers with a very low power consumption, has revolutionised the technological market for this product. As a result of the success of the knowledge already known about liquid crystals and their properties, and their as yet unexplored potential, it is not suprising that there is an extremely large amount of research into the area. In relation to this, in this project, a five ring bent-shaped liquid crystal, which is relatively new compound in liquid crystalline phase, was synthesized using several organic synthesis methods, such as, Diazonium coupling reaction, Williamson ether synthesis, hydrolysis and reaction with resorcinol. The compounds synthesized were characterized through FTIR analysis, melting point, and its physical apperances. Other than that, the percent yield for each compound also have been calculated. The compound synthesized in first step, ethyl4-4-(hydroxyphenylazo)benzoate was a red color solid with melting point at 235 C and the percent yield was 52.07%. In second step 3.542 grams of Ethyl-4-(4-hexadecanoxyphenylazo)benzoate which orange in color with melting point of 135 C was obtained. The percent yield from the reaction was 42.11%. The third compound synthesized was yellow color solid with melting point of 280-290 C and the final compound was 1,3-Phenelyne bis[4-(4-hexadecanoxyphenylazo)benzoate], a pale yellow color solid with melting point at range of 130-135 C was obtained.

Book Synthesis and Characterization of Oriented Liquid Crystalline Networks

Download or read book Synthesis and Characterization of Oriented Liquid Crystalline Networks written by Henrik Andersson and published by . This book was released on 1995 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Synthesis and Characterization of Liquid Crystal Compounds and Their Applications in Photonic Films Field Sequential Color Displays and Elastomer Actuators

Download or read book Synthesis and Characterization of Liquid Crystal Compounds and Their Applications in Photonic Films Field Sequential Color Displays and Elastomer Actuators written by 張彥松 and published by . This book was released on 2018 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book DESIGN SYNTHESIS AND CHARACTERIZATION OF INDANE 2 5 DIKETOPIPERAZINES FOR LIQUID CRYSTAL APPLICATIONS

Download or read book DESIGN SYNTHESIS AND CHARACTERIZATION OF INDANE 2 5 DIKETOPIPERAZINES FOR LIQUID CRYSTAL APPLICATIONS written by Francis Murigi and published by . This book was released on 2011 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-covalent interactions are of great importance in biology, chemistry, and material sciences. Although much information about different types of non-covalent interactions is available, incorporating them in a molecular design to generate a molecule that can undergo association to form a molecular assembly with bulk properties of interest is a challenge. To understand and harness intermolecular interactions, we have designed an indane 2,5-diketopiperazine (DKP) scaffold. Crystal engineering studies with this scaffold show that the molecules assemble into one dimensional tapes via reciprocal amide hydrogen bonds, tapes assemble into two dimensional sheets via arene-arene interactions, and sheets assemble into three dimensional solids via van der Waals contacts. A series of tetraalkoxy-substituted DKPs previously investigated exhibited liquid crystalline behavior. A new class of DKPs with one alkoxy substituent, rather than two, on each benzene ring has been synthesized. Thermochemical studies of the new DKPs by differential scanning calorimetry and polarized optical microscopy show that they are not liquid crystalline as expected. However, in the process of making the DKPs, conformationally constrained tyrosine analogues, (R)- and (S)-5-hydroxy-2-aminoindan- 2-carboxylic acids, were prepared by chromatographic separation of diastereomeric dipeptide derivatives formed from N-Boc-L-phenylalanine. Absolute configurations were assigned by X-ray crystallographic analysis. The series of tetraalkoxy-substituted DKPs showed a remarkable trend in freezing point. The freezing point for the series decreases with an increase in alkyl chain length. To understand the relationship between the crystal packing interactions and the freezing point trend, a study of the association of DKPs in solution by NMR was initiated. An Nmethylated 2,5-diketopiperazine was previously synthesized and studied by NMR using chloroform as solvent to obtain equilibrium constants for self association. Attempted multi-step syntheses of a more lipophilic N-3,7-dimethyloctyl 2,5-diketopiperazine, which was expected to have solubility in non-interfering solvents such as carbon disulfide, benzene, and carbon tetrachloride, failed. In response, a direct and concise method for accessing N-alkyl DKPs was developed, and an N-decyl 2,5-diketopiperazine was synthesized. X-ray crystallographic analysis of the N-decyl 2,5-diketopiperazine reveals formation of dimers via hydrogen bonding in the solid state.