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Hydrostatic Pressure-Induced Spectral Variation of Reichardt’s Dye: A Polarity/Pressure Dual Indicator

Lookup NU author(s): Dr Julien EngORCiD, Professor Thomas Penfold



This is the final published version of an article that has been published in its final definitive form by American Chemical Society, 2020.

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The famous solvatochromic Reichardt’s dye was applied to quantify hydrostatic pressure in media. The UV/vis spectra of the dye in various organic solvents are shifted bathochromically or hypsochromically at the shorter- or longer-wavelength band, respectively, upon hydrostatic pressurization. The ET value, determined by an absorption maximum, in ethyl acetate increases from 38.5 kcal mol–1 at 0.1 MPa to 39.2 kcal mol–1 at 300 MPa, which is mostly equal to the one in chloroform at 0.1 MPa. These spectroscopic origins were supported by the time-dependent density functional theory (TD-DFT) calculations. The concept and approach proposed in this paper, i.e., a dual indicator, should attract the attention of a broad spectrum in multidisciplinary science.

Publication metadata

Author(s): Miyagawa A, Eng J, Okada T, Inoue Y, Penfold TJ, Fukuhara G

Publication type: Article

Publication status: Published

Journal: ACS Omega

Year: 2020

Volume: 5

Issue: 1

Pages: 897-903

Print publication date: 14/01/2020

Online publication date: 26/12/2019

Acceptance date: 10/12/2019

Date deposited: 29/12/2019

ISSN (electronic): 2470-1343

Publisher: American Chemical Society


DOI: 10.1021/acsomega.9b03880


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