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STUDY THE PROPERTIES OF THERMOTROPIC LIQUID CRYSTALS INDUCED BY HYDROGEN BONDING BETWEEN PYRIDYL- HETEROCYCLIC DERIVATIVES AND BENZOIC ACID, 4-HEPTYLOXYBENZOIC ACID OR 4-OCTYLOXYBENZOIC ACID

Author: Nasreen Raheem Jber
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2010 Volume: 13 Issue: 4 Pages: 62-69
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Synthesis of new derivatives of heterocyclic compounds such as (Triazoles, tetrazole, oxazoleand thiadiazole). Liquid crystalline complexes have been obtained from binary mixtures of(4-pyridyl) heterocyclic derivatives with benzoic acid, 4-heptyloxychlorobenzoic acid or4-octyloxybenzoic acid. The (4-pyridyl) heterocyclic derivatives are not mesomorphic, but theH-bonded complexes are showed droplets nematic texture which is developed from threadednematic on slow heating. Their liquid crystalline properties were investigated by polarizing opticalmicroscopy.


Article
Synthesis and Characterization of New Mesomorphic Azo Compounds and Study their Photoluminesecence Properties
تحضير وتشخيص مركبات بلورية سائلة عالية التبادل

Authors: Marwa S. Hatem مروة سهيل حاتم --- Nasreen R. Jber نسرين رحيم جبر
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2016 Volume: 13 Issue: 2ملحق ابحاث المؤتمر الوطني الثاني للكيمياء Pages: 333-344
Publisher: Baghdad University جامعة بغداد

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Abstract

The preparation of a new Azo compounds of highly conjugated dimeric and polymeric liquid crystal to achieve the crystalline characteristics Which have structures assigned based on elemental analysis, IR 1HNMR and CHNS-O while mesogenic properties have been set for DSC and hot-stage polarizing optical microscopy. The compounds show enantiotropicnematic phase being displayed.The compounds show photoluminescence properties in the organic solution at room temperature, with the fluorescence band centered around 400 nm.

تم إعداد مركبات نيتروجينية جديدة عالية الاقتران الثنائيه و البوليمر من السائل البلوري لتحقيق خصائصها البلورية. التي يكون هياكلها على أساس تحليل العناصر، IR 1HNMR وCHNS-O بينما تم تعيين خصائص mesogenic عن طريق DSC والمرحلة الساخنة للمجهر الضوئي المستقطب .تظهر مركبات التي تم تحضيرها الطور الخيطي enantiotropic.كما تظهر خصائص تلألئ فوتوني عند اذابتها بواسطة المذيبات العضويه في درجة حرارة الغرفة، مع حزمة فلوره تتمحور حول 400 نانومتر.

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