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Understanding changes in excited state properties under the influence of an external stimulus, such as pressure or temperature, is important in the context of optimizing molecular components for a number of applications including sensors and imaging reagents. Herein, we use UV/Vis absorption, fluorescence and excitation spectroscopies and fluorescence lifetime measurements supported by calculations to probe the effect of hydrostatic pressure on the excited state characteristics of a conformationally‐divergent mechanochromic compound PTZ‐DBPHZ (containing two phenothiazine moieties attached to a dibenzo[a,j]phenazine core) in toluene and methylcyclohexane. We demonstrate that hydrostatic pressure can be used to manipulate the equilibria between excited state conformers. This work provides new perspectives for mechanoresponsive materials and as an attractive alternative to conventional ratiometric sensors. [ABSTRACT FROM AUTHOR]

Dibenzophenazine, excited states, quantum chemistry, time-resolved spectroscopy, transient absorption More information can be found in the Article by Oliver Weingart, Youhei Takeda, Peter Gilch and co-workers. Keywords: dibenzophenazine; excited states; quantum chemistry; time-resolved spectroscopy; transient absorption EN dibenzophenazine excited states quantum chemistry time-resolved spectroscopy transient absorption 294 294 1 04/22/21 20210401 NES 210401 B The Front Cover b depicts the first author Kristoffer Thom explaining, with the aid of a blackboard, the results of a collaboration between HHU Düsseldorf (Germany) and Osaka University (Japan) on the photophysics of dibenzo[ I a,j i ]phenazine. [Extracted from the article]