Synthesis and Characterization of Two Phenyl Ring Core-Based Thiophene Mesogens

Autor:	M. Kesava Reddy, Muthuramalingam Prakash, K. Subramanyam Reddy, Tanneru Narasimhaswamy
Rok vydání:	2013
Předmět:	Materials science Mesogen Chemical shift Mesophase General Chemistry Condensed Matter Physics Ring (chemistry) chemistry.chemical_compound Crystallography chemistry Liquid crystal Phase (matter) Polymer chemistry Alkoxy group Thiophene General Materials Science
Zdroj:	Molecular Crystals and Liquid Crystals. 582:1-14
ISSN:	1563-5287 1542-1406
Popis:	Novel thiophene mesogens built with two phenyl ring core and alkoxy terminal chains are synthesized by multistep route. The phenyl ring core is connected to thiophene by ester unit at (a) 2-position and (b) 3-position to yield 2-series of mesogens. The structural characterization of them is accomplished by using spectroscopy tools and the mesophase characteristics are evaluated by HOPM and DSC. The 13C chemical shifts of representative mesogens calculated from DFT by quantum chemical calculations are compared with experimental 13C chemical shifts and further utilized for structural assignment of core unit carbons. A good agreement between calculated and experimental values is noticed. An enantiotropic nematic phase is confirmed for all the mesogens and accordingly threaded nematic texture in HOPM is observed and is supported by DSC transition enthalpy values. The mesophase as well as thermal stabilities of the mesogens are discussed with reference to terminal chain length and position of the linking unit ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ce39c9e35dc44a2175a39dfef0362142 https://doi.org/10.1080/15421406.2013.790635 Zobrazit plný text záznamu