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Title: Piezochromic Behavior of 2,4,6-Triphenylpyrylium Tetrachloroferrate

Journal Article · · Small Science

In advanced photonics, there is a growing interest in piezochromic luminescent materials that exhibit multicolor switching, driven by their potential applications in optical recording, memory, and sensors. Here, the piezochromic behavior of 2,4,6-triphenylpyrylium tetrachloroferrate (Py-FeCl4) under high pressures from 0 to 9 GPa is reported. The observed multicolor changing properties of Py-FeCl4 (yellow–orange–red–maroon–black) are found to be fully reversible upon decompression to ambient conditions. The mechanism of Py-FeCl4 piezochromism is investigated via Raman, infrared, and UV–vis spectroscopy combined with powder X-ray Diffraction. The absence of structural phase transitions as well as the abrupt shifts of bandgap values together with characteristic Raman and IR peaks within 0-9 GPa suggests that the Py-FeCl4 multicoloring switching behavior is driven by an electron transfer between the inorganic FeCl4 anion and the organic pyrylium cation. The obtained results demonstrate that Py-FeCl4 dye is a good candidate for developing high-pressure sensing technologies designed to function in extreme environments. Moreover, due to the inherent role of molecular-structure relationships in the pyrylium salt's photophysical properties, findings suggest the potential discovery of piezochromic behavior in other pyrylium compounds.

Research Organization:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0023248; AC02-06CH11357
OSTI ID:
2341405
Alternate ID(s):
OSTI ID: 2382818
Journal Information:
Small Science, Journal Name: Small Science Journal Issue: 8 Vol. 4; ISSN 2688-4046
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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