What is the process and significance of spin-forbidden transitions in electronic spectroscopy, and how does intersystem crossing affect the photochemical reactivity of molecules?

Answer 1

Spin-forbidden transitions in electronic spectroscopy involve changes in electron spin state, typically from a singlet to a triplet state, which are quantum mechanically forbidden but can occur via spin-orbit coupling. Intersystem crossing (ISC) facilitates these transitions, significantly affecting photochemical reactivity by enabling non-radiative decay paths and altering reaction mechanisms.

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