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تحضير وتشخيص بعض المركبات الميزوجينية ودراسة تاثير التراكيب اجيئي على صفاتها البلورية السائلة == Synthesis and Characterization of Some mesogenic Compounds and Study the Effect of molecular Structure on their liquid ?? crystalline properties
اسم المؤلف:
مروة عدنان ناصر الامين
اسم المشرف:
عهود جبار عبيد الحمداني
الموضوع العام:
علوم الكيمياء
السنة:
2011
الموضوع الدقيق:
الكيمياء
الدرجة:
ماجستير
الجامعة:
جامعة البصرة - كلية التربية
اللغة:
العربية
مكان الجامعة:
البصرة
الصفحات الاولى:
📎 25T1625 - p.pdf
المستخلص:
This thesis consist of three chapters : The first are contains of the general characteristics , classification, structure and mesomorphic properties of liquid crystals.The second chapter describes the synthesis of two series of Schiff bases and the compounds 1 - 5 and which have the general formulas : R=CnH2n+1 n=1 - 10 3 - hydroxy - 4 - (p - tolylimino)methyl)phenyl4 - (alkyl thio)benzoate R=CnH2n+1 n=2 - 6,8 4 - ((4 - acetyl pheenylimino)methyl) - 3 - hydroxyphenyl 4 - (alkylthio) benzoate 3 - hydroxy - 4 - (p - tolylimino)methyl)phenyl 4 - mercaptobenzoate 4((p - tolylimino)methyl)phenyl4 - (alkylthio)benzoate 4 - ((4 - acetyl pheenylimino)methyl) - 3 - hydroxyphenyl 4 - ( octayloxy)benzoate 4 - ((4 - acetyl pheenylimino)methyl) phenyl 4 - (heptythio)benzoate 4 - hydroxy - 3 - (p - tolylimino)methyl)phenyl 4 - mercaptobenzoat The characterization of the above prepared compounds was a chieved by 1H,13C,DEPT - NMR, IR as well as elemental analysis.The third chapter contains the study of liquid crystalline properties of the prepared compound using polarized optical microscope (POM) and differential scaning colametry (DSC).The Results of the above study revealed that both series [I] and series [II] as well as the compound 2 - 4 a nemac phase of marbled texture with heang and schl ier en wi th cool ing except comp ound 1 and 2 changed to the liquid phase directly .while series [II] shows a smectic phase in addition to the nematic phase of focal conic shape with heating and battonets with cooling .
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