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Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
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Transient Activation Windows Program Adaptive Photochemical Responses.

Jinghong Dai1, Zhiwei Zhang1, Wenhui Wang1

  • 1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, P. R. China.

Angewandte Chemie (International Ed. in English)
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

Biological systems use transient states for timed responses. This study introduces a molecular platform where pH changes control light-driven chemistry, creating timed molecular switches.

Keywords:
charge‐transfer complexdissipative systemstemporally gated photochemistrytriplet‐sensitizationvisible‐light photoswitching

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Area of Science:

  • Molecular chemistry
  • Photochemistry
  • Supramolecular chemistry

Background:

  • Biological systems exhibit transient activation states for regulated responses.
  • Understanding these states is key to developing dynamic molecular systems.
  • Existing molecular switches lack temporal control over their activation.

Purpose of the Study:

  • To develop a temporally gated molecular platform.
  • To control visible-light photochemistry using dynamic pH evolution.
  • To mimic biological systems' transient activation for molecular control.

Main Methods:

  • Integration of a proton-responsive charge-transfer complex (CTC) sensitizer and a diarylethene photoswitch.
  • Utilizing reversible protonation of the CTC for chemical gating.
  • Coupling the CTC with a dissipative pH-regulation network to create a transient activation window.

Main Results:

  • Demonstrated chemical gating of triplet-sensitized photochromism.
  • Established a transient activation window controlled by pH dynamics.
  • Achieved time-dependent photochemical responses to identical optical stimuli.
  • Observed adaptive behaviors analogous to biological visual fatigue.

Conclusions:

  • Successfully translated chemical gating into temporal gating of molecular photoswitches.
  • The developed platform offers dynamic control over photochemical reactions.
  • The system exhibits adaptive behaviors, opening avenues for biomimetic molecular devices.