# Reinventing Chemiluminescence through Redox-Driven Self-Assembly

## TL;DR

A new type of chemiluminescence is discovered, where light is produced through redox reactions that form glowing platinum aggregates.

## Contribution

A novel chemiluminescence mechanism is introduced, driven by redox-triggered self-assembly of Pt(II) aggregates.

## Key findings

- Light emission arises from self-assembled Pt(II) aggregates, not from discrete molecular species.
- The emissive state is confirmed to be intrinsic to the aggregated Pt(II) architecture.
- Emission intensity and persistence depend on the reductant used, ranging from flashes to afterglow.

## Abstract

Chemiluminescence
(CL) typically derives from harvesting the energy
released during the cleavage of covalent bonds, wherein molecular
substrates are irreversibly consumed to generate electronically excited
states. In contrast, regenerative CL seeks to bypass substrate decomposition
by using reversible redox processes to produce emissive states, an
approach that is largely limited to polypyridyl complexes of Ru­(II)
and Cr­(III). Here, we report a fundamentally distinct chemiluminescence
mechanism in which the exergonic reduction of Pt­(IV) complexes powers
the spontaneous formation of emissive Pt­(II) aggregates. Notably,
light emission arises not from discrete molecular species but from
the self-assembled state, whose electronic structure features a lowered
excited-state energy (E
0,0) conducive
to radiative decay. The emission spectrum observed during chemical
reduction matches that of photoexcited aggregates, confirming that
the emissive state is intrinsic to the aggregated Pt­(II) architecture.
This chemiluminescence occurs without external photoexcitation, and
its intensity and persistence depend on the nature of the reductant,
ranging from transient flashes to sustained afterglow. These findings
unveil a new energy transduction pathway in CL: emission driven by
redox-triggered self-assembly, expanding the conceptual and chemical
space of chemiluminescence beyond classical molecular luminophores
and toward dynamic, structure-responsive materials.