عنوان المقالة:Synthesis and characterization of new mesogenic esters derived from 1,2,4-oxadiazole and study the effect of alkoxy chain length in their liquid crystalline properties
غسان قيس علي | Ghassan Qays Ali | 4856
نوع النشر
مجلة علمية
المؤلفون بالعربي
Ghassan Q. Ali & Ivan Hameed R Tomi
المؤلفون بالإنجليزي
Ghassan Q. Ali & Ivan Hameed R Tomi
الملخص العربي
ABSTRACT In this study, a new series of non-symmetrically 3,5-disubstituted of 1,2,4-oxadiazole derivatives, 4-[5-(4-methylphenyl)-1,2,4-oxadiazol-3-yl]-phenyl-4-alkoxybenzoate (G1–G11), which containing ether and ester linkages in the same molecule, is synthesized using different synthetic procedures and their structures are confirmed by several spectroscopic techniques (FT-IR and 1 H nuclear magnetic resonance). The mesomorphic properties of these compounds are studied by differential scanning calorimetry (DSC) and polarized optical microscopy (POM); all these derivatives exhibited as mesogens and displayed an enantiotropic liquid crystal with nematic texture, the nematogenic phase of these materials was appeared in wide temperature ranges on heating and cooling cycles that were observed by POM and DSC. The influence of 1,2,4-oxadiazole ring and the elongation of alkyl chain in the mesomorphic properties of this series were investigated. The mesogenic behaviour of this series was compared with the compounds possessing a somewhat similar structure.
تاريخ النشر
11/07/2017
الناشر
LIQUID CRYSTALS
رقم المجلد
45
رقم العدد
3
رابط DOI
10.1080/02678292.2017.1338767
الصفحات
421–430
رابط خارجي
https://www.tandfonline.com/doi/abs/10.1080/02678292.2017.1338767
الكلمات المفتاحية
1,2,4-Oxadiazole; mesomorphic; liquid crystalline; ester mesogens
رجوع