Title:	Synthesis, characterization and nonlinear optical studies of novel blue-light emitting room temperature truxene discotic liquid crystals
Authors:	Vinayakumara, D.R. Kumar, Manish Sreekanth, P. Philip, Reji Kumar, Sandeep
Issue Date:	6-Mar-2015
Publisher:	Royal Society of Chemistry
Citation:	RSC Advances, 2015, Vol. 5, p26596-26603
Abstract:	A new series of discotic liquid crystals based on a truxene core has been synthesized to study the structure–property relationship in view of the self-assembling property and their linear and nonlinear optical properties. All these branched alkyl chain truxene derivatives show a mesogenic property in a columnar hexagonal fashion at room temperature which is studied by a combination of different techniques. The newly synthesized truxene discotic 7a possesses a clearing temperature of 117 °C, one of the lowest clearing temperatures known in truxene discotic liquid crystals. We have discovered that the introduction of branching near to the core even in a small alkyl chain drastically reduces the isotropic temperature. Due to their C3 symmetry and their large first hyperpolarizability, these truxene derivatives show long-lived emissions in the solution state at room temperature. We also report large effective three-photon absorption in these materials under nanosecond laser pulse excitation at 532 nm, which makes them suitable candidates for optical limiting applications.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/7021
ISSN:	2046-2069 (Online)
Alternative Location:	http://dx.doi.org/10.1039/C5RA00873E
Appears in Collections:	Research Papers (SCM)

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