Document Type

Article

Publication Date

11-15-2019

Publication Title

Journal of Molecular Structure

Publisher

Elsevier

Volume

1202

First page number:

1

Last page number:

7

Abstract

A group of five 2,4,6-tris(4-substituted phenyl)pyrylium tosylates were synthesized in one-pot reaction from para-substituted benzaldehyde and para-substituted acetophenones using tosic acid as a condensing agent. The tosylate salts were converted to the corresponding triflimide salts by metathesis reactions. Chemical structures, as well as optical spectroscopic and thermal properties of these salts were studied using pertinent experimental techniques. Trimethyl- and trihalo-substituted pyrylium salts emitted strong blue light with peaks in the 456 nm–479 nm range and trimethoxy-pyrylium salts emitted intense green light with maxima around 526 nm in acetonitrile solution. Quantum yields of the solutions were rather low, but the salts were also fluorescent in the solid state. Acetonitrile solution of trichloro-substituted pyrylium triflimide showed significant spectral line narrowing and fluorescence lifetime shortening under intense excitation, and laser action with minimal feedback. The salts have low melting transitions compared to the corresponding –BF4 salts, and their thermal stability is excellent with decomposition temperature in the 268–402 °C range in nitrogen.

Keywords

Pyrylium tosylates; Pyrylium triflimides; Absorption spectra; Fluorescence; Quantum yields; Laser

Disciplines

Chemistry | Physical Sciences and Mathematics

File Format

pdf

File Size

1.149 KB

Language

English

Available for download on Sunday, November 15, 2020

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