Jump to main content
Jump to site search
Publishing
Advanced

Issue 4, 2010
Previous Article Next Article

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

Back to tab navigation
Download options Please wait...

Supplementary files

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
Permissions
Request permissions

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

If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center. Go to our Instructions for using Copyright Clearance Center page for details.

Authors contributing to RSC publications (journal articles, books or book chapters) do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    Reproduced from Ref. XX with permission from the Centre National de la Recherche Scientifique (CNRS) and The Royal Society of Chemistry.
  • For reproduction of material from PCCP:
    Reproduced from Ref. XX with permission from the PCCP Owner Societies.
  • For reproduction of material from PPS:
    Reproduced from Ref. XX with permission from the European Society for Photobiology, the European Photochemistry Association, and The Royal Society of Chemistry.
  • For reproduction of material from all other RSC journals and books:
    Reproduced from Ref. XX with permission from The Royal Society of Chemistry.

If the material has been adapted instead of reproduced from the original RSC publication "Reproduced from" can be substituted with "Adapted from".

In all cases the Ref. XX is the XXth reference in the list of references.

If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc. contained in this article in third party publications or in a thesis or dissertation provided that the correct acknowledgement is given with the reproduced material.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Reproduced by permission of The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC
  • For reproduction of material from PCCP:
    [Original citation] - Reproduced by permission of the PCCP Owner Societies
  • For reproduction of material from PPS:
    [Original citation] - Reproduced by permission of The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC
  • For reproduction of material from all other RSC journals:
    [Original citation] - Reproduced by permission of The Royal Society of Chemistry

If you are the author of this article you still need to obtain permission to reproduce the whole article in a third party publication with the exception of reproduction of the whole article in a thesis or dissertation.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements