Title:	Synthesis and Liquid crystal property of new fluoro coumarin carboxylates
Authors:	Mahadevana, Kittappa M Harishkumar, Hosanagara N Masagalli, Jagadeesh N Srinivasa, H.T.
Keywords:	4-Alkoxyphenyl-coumarin-3-carboxylate focal conic texture mesophase
Issue Date:	22-Jan-2013
Publisher:	Taylor & Francis
Citation:	Molecular Crystals and Liquid Crystals, 2013, Vol.570, p20
Abstract:	New liquid crystalline 4-alkoxyphenyl-coumarin-3-carboxylates 6a–e, 7a–g, 8a–e, and 9a–e were prepared by reacting various coumarin-3-carboxylic acids 5a–d with 4-(alkoxy) phenols 4a–g in the presence of 1(3-dimethylaminopropyl-3-ethylcarbodiimide/dimethyl amino pyridine (EDCI/DMAP) as a coupling agent. The structures of the new coumarin derivatives were confirmed by spectral analysis and the liquid crystalline property was established by polarizing optical microscope and by differential scanning calorimetric techniques. The diethyl amine and morpholine were taken as electron-donating and –CF3 as electron-withdrawing groups at the seventh position of the coumarin-3-carboxylic acids to check the mesomorphic property in all new 4-alkoxyphenyl-coumarin-3-carboxylates. Among them, only 4-alkoxyphenyl-7-triflouromethyl-coumarin-3-carboxylates 7a–g exhibited liquid crystalline SmA phase
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/5575
ISSN:	1542-1406 1563-5287 (Online)
Alternative Location:	http://dx.doi.org/10.1080/15421406.2012.704824
Copyright:	2013 Taylor & Francis
Appears in Collections:	Research Papers (SCM)

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