What question did this study set out to answer?

To synthesize symmetrically substituted 3,7,10-triarylphenothiazines and determine how donor and acceptor substituents modulate their conformational equilibria, redox states, and emission behaviors.

August 19, 2026PhotochemOpen Access

Electronically Controlled Conformational Equilibria in Symmetrically Substituted 3,7,10-Triarylphenothiazines: Tuning Redox and Emission Properties

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Authors

LMLaura Mayer TMThomas J. J. Müller

Discussion

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Overview

Spectroscopic and computational study demonstrates electronic control of conformational equilibria in 3,7,10-triarylphenothiazines, highlighting modular tuning of redox and emission properties.

Key Points

To synthesize symmetrically substituted 3,7,10-triarylphenothiazines and determine how donor and acceptor substituents modulate their conformational equilibria, redox states, and emission behaviors.
Synthesized four representative 3,7,10-triarylphenothiazine derivatives via a sequential palladium-catalyzed pseudo-four-component strategy combining Suzuki arylation and Buchwald–Hartwig amination.
Characterized electrochemical and optical properties using cyclic voltammetry, UV-vis absorption spectroscopy, and fluorescence emission spectroscopy.
Performed density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations to assign electronic transitions and evaluate ground- and excited-state geometries.
Substitution with a p-anisyl donor at the central nitrogen atom stabilized the intra-oriented ground-state conformation, generating intense low-energy absorption and high fluorescence quantum yields.
Introducing an electron-accepting p-benzonitrile unit at the nitrogen position shifted equilibrium toward the extra-oriented conformation, altering electronic transitions and lowering fluorescence efficiency.
Combining 3,7-bis(p-anisyl) donor units with an N-(p-benzonitrile) acceptor made the extra-oriented geometry predominant, causing pronounced fluorescence quenching.

Cite This Study

Mayer et al. (2026) studied this question.

synapsesocial.com/papers/6a8563ae03308d306e2d70b0 https://doi.org/10.3390/photochem6030030

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August 19, 2026PhotochemOpen Access

Electronically Controlled Conformational Equilibria in Symmetrically Substituted 3,7,10-Triarylphenothiazines: Tuning Redox and Emission Properties

View Full Paper

Ask AI

Bookmark

Authors

LMLaura Mayer TMThomas J. J. Müller

Discussion

Member takes

Overview

Spectroscopic and computational study demonstrates electronic control of conformational equilibria in 3,7,10-triarylphenothiazines, highlighting modular tuning of redox and emission properties.

Key Points

To synthesize symmetrically substituted 3,7,10-triarylphenothiazines and determine how donor and acceptor substituents modulate their conformational equilibria, redox states, and emission behaviors.
Synthesized four representative 3,7,10-triarylphenothiazine derivatives via a sequential palladium-catalyzed pseudo-four-component strategy combining Suzuki arylation and Buchwald–Hartwig amination.
Characterized electrochemical and optical properties using cyclic voltammetry, UV-vis absorption spectroscopy, and fluorescence emission spectroscopy.
Performed density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations to assign electronic transitions and evaluate ground- and excited-state geometries.
Substitution with a p-anisyl donor at the central nitrogen atom stabilized the intra-oriented ground-state conformation, generating intense low-energy absorption and high fluorescence quantum yields.
Introducing an electron-accepting p-benzonitrile unit at the nitrogen position shifted equilibrium toward the extra-oriented conformation, altering electronic transitions and lowering fluorescence efficiency.
Combining 3,7-bis(p-anisyl) donor units with an N-(p-benzonitrile) acceptor made the extra-oriented geometry predominant, causing pronounced fluorescence quenching.

Cite This Study

Mayer et al. (2026) studied this question.

synapsesocial.com/papers/6a8563ae03308d306e2d70b0 https://doi.org/10.3390/photochem6030030

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