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Issue 4, 2010
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Novel selenoesters fluorescent liquid crystalline exhibiting a rich phase polymorphism†

Daniel S. Rampon,a   Fabiano S. Rodembusch,a   Juliana M. F. M. Schneider,a   Ivan H. Bechtold,b   Paulo F. B. Gonçalves,c   Aloir A. Merlo*a  and  Paulo H. Schneider*a  
Author affiliations

* Corresponding authors

a Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS, C.P. 15003, Porto Alegre-RS, Brazil
E-mail: paulos@iq.ufrgs.br
Fax: +55 51 3308 7304
Tel: +55 51 3308 6286

b Departamento de Física, Universidade Federal de Santa Catarina –UFSC, 88040-900 Florianópolis-SC, Brazil

c Instituto de Química, Centro Universitário La Salle, Av. Victor Barreto, 2288. Centro, Canoas, RS, Brasil

Abstract

A simple and efficient procedure for the synthesis of a new class of selenoesters 4a and 4b was developed. Polarized-light optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction showed that the selenoester 4a with a shorter alkyl chain displayed a wide nematic range (ΔT = 110.7 °C), while 4b with a longer alkyl chain possesses a rich phase polymorphism: Cr → SmI → SmC → N → I mesophase sequence during heating cycle and I → N → SmC → SmI → SmX → Cr transition on cooling. For 4b, a large temperature range (135.7 °C) from crystal to isotropic phase can be observed. In addition, UV-Vis, steady-state fluorescence emission and excitation spectra in solution were also applied in order to characterize their photophysical behaviour. Compounds 4a and 4b are fluorescent in the blue region and present a Stokes shift at around 80 nm and 39 nm in dichloromethane and dioxane, respectively.

Graphical abstract: Novel selenoesters fluorescent liquid crystalline exhibiting a rich phase polymorphism

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Article information

https://doi.org/10.1039/B917366H
Submitted
22 Aug 2009
Accepted
28 Oct 2009
First published
04 Dec 2009
J. Mater. Chem., 2010,20, 715-722
Article type
Paper
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Novel selenoesters fluorescent liquid crystalline exhibiting a rich phase polymorphism

D. S. Rampon, F. S. Rodembusch, J. M. F. M. Schneider, I. H. Bechtold, P. F. B. Gonçalves, A. A. Merlo and P. H. Schneider, J. Mater. Chem., 2010, 20, 715
DOI: 10.1039/B917366H

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