Document Type

Article

Publication Date

8-20-2021

Publication Title

Journal of Molecular Liquids

Volume

341

First page number:

1

Last page number:

13

Abstract

Two series of new dicationic stilbazolium salts containing tosylate and triflimide counterions, respectively, were synthesized and characterized by spectroscopic techniques and elemental analysis. Despite of their promesogenic structures, none of these salts are mesomorphous, and instead they solely exhibit crystalline polymorphism, as deduced from differential scanning calorimetry, polarizing optical microscopy and variable temperature X-ray measurements. These salts were also found to be highly thermally stable with decomposition temperatures occurring well above 300 °C, and up to 367 °C for the triflimide salts, as determined by thermogravimetric analysis. UV–Vis absorption and photoluminescent properties were examined in both solution and in the solid state. They exhibited higher absolute quantum yields in the powdered state than in solution. The dielectric response was evaluated by impedance spectroscopy, revealing notable values of short-range conductivity in triflimide salts through amorphous regions. Our work demonstrates the potential of these new stilbazolium salts as advanced materials in optoelectronic devices, with performances that can be tailored by molecular design of the spacer's flexibility and choice of counter anions.

Keywords

Dicationic stilbazolium salts; Differential scanning calorimetry; Ionic conductivity; Luminescence; Polarized optical microscopy; UV–vis spectroscopy; Variable temperature X-ray diffraction

Disciplines

Atomic, Molecular and Optical Physics

File Format

pdf

File Size

2413 KB

Language

English

Rights

IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

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