Issue 4, 2010

Novel selenoesters fluorescent liquid crystalline exhibiting a rich phase polymorphism

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: CrSmISmCN → I mesophase sequence during heating cycle and I → NSmCSmISmXCr 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

Supplementary files

Article information

Article type
Paper
Submitted
22 Aug 2009
Accepted
28 Oct 2009
First published
04 Dec 2009

J. Mater. Chem., 2010,20, 715-722

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements