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Effect of orientation and polarity of lateral substituent on the mesophase behavior of some azo/ester liquid crystals / Manal Mahmoud Abdeltawab ; Supervised Nadia H. Metwally , Magdi M. Naoum , Hoda A. Ahmed

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Manal Mahmoud Abdeltawab , 2015Description: 133 ,19 P. : charts , facsimiles ; 25cmOther title:
  • تأثير إتجاه و إستقطابية المستبدلات العرضية على سلوك طور الوسط لبعض أزو/ استر البلورات السائلة [Added title page title]
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Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Organic Chemistry Summary: Eight homologous series of laterally substituted three-ring azo/ester compounds (Ina-h) including the un-substituted homologues (Inc), were prepared and investigated for their mesophase formation and stability. Within each of the homologous series, namely 2-(or 3-) substituted phenyl 4-(4-alkoxy phenylazo) benzoates, the number of carbons in the terminal alkoxy group varies between 6 and 12 carbons. The lateral substituent on the other terminal ring varies between the electron-donating (CH3) and electron-withdrawing (F, Br, and CN) groups, including the hydrogen (H). The study is conducted to investigate the effect of polarity, position, size, as well as the spatial orientation of the lateral substituent, on the mesomorphic properties of the produced derivatives. Molecular formulae of all compounds prepared were confirmed via elemental analyses, IR, 1H-NMR, and MS. Their mesophase behavior were characterized by differential scanning calorimetry ( DSC), and mesophases identified by polarized light microscopy (PLM), and confirmed by miscibility with standard SmA compound. A comparative study was made between the investigated compounds and their previously prepared linearly substituted isomers, namely, 4-substituted phenyl 4- (4-alkoxy phenylazo) benzoates (Ini-k)
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Item type Current library Home library Call number Copy number Status Date due Barcode
Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.12.10.M.Sc.2015.Ma.E (Browse shelf(Opens below)) Not for loan 01010110070137000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.12.10.M.Sc.2015.Ma.E (Browse shelf(Opens below)) 70137.CD Not for loan 01020110070137000

Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Organic Chemistry

Eight homologous series of laterally substituted three-ring azo/ester compounds (Ina-h) including the un-substituted homologues (Inc), were prepared and investigated for their mesophase formation and stability. Within each of the homologous series, namely 2-(or 3-) substituted phenyl 4-(4-alkoxy phenylazo) benzoates, the number of carbons in the terminal alkoxy group varies between 6 and 12 carbons. The lateral substituent on the other terminal ring varies between the electron-donating (CH3) and electron-withdrawing (F, Br, and CN) groups, including the hydrogen (H). The study is conducted to investigate the effect of polarity, position, size, as well as the spatial orientation of the lateral substituent, on the mesomorphic properties of the produced derivatives. Molecular formulae of all compounds prepared were confirmed via elemental analyses, IR, 1H-NMR, and MS. Their mesophase behavior were characterized by differential scanning calorimetry ( DSC), and mesophases identified by polarized light microscopy (PLM), and confirmed by miscibility with standard SmA compound. A comparative study was made between the investigated compounds and their previously prepared linearly substituted isomers, namely, 4-substituted phenyl 4- (4-alkoxy phenylazo) benzoates (Ini-k)

Issued also as CD

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