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Updated: Jan 15, 2026

A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence FUEL
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解锁红至近红外发光,通过碳二甲离子中的离子对组合解锁红至近红外发光

Chun-Lin Deng1, Bi Youan E Tra1, Xibao Zhang1

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA.

Nature chemistry
|October 6, 2025
PubMed
概括

开发了稳定的发射器,可以实现高效的红色和近红外 (NIR) 光发射. 这些碳二甲 (CDC) - 玻拉[c]二甲离子为设计先进的长波长有机发光材料提供了新的途径.

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Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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