Abstract

Spin chemistry involving small organic molecules without heavy atoms is highly sensitive to spin-orbit-coupling (SOC) modulating biradical conformation as well as hyperfine coupling (HFC) modulating magnetic isotope interactions. Several easily available reaction properties such as chemo-, regio-, and diastereoselectivity as well as quantum yields serve as analytical tools to follow intersystem crossing (ISC) dynamics and allow titrating spin selectivities.

Highlights

  • This publication is dedicated to the memory of Thomas Bally, a wise and humorous colleague who passed away much too early in 2019

  • Thomas was a member of the Fribourg Chemistry Department, a colourful and stimulating group of chemists

  • Many of them were interested in photo excitation processes and photochemistry and I would like to present some ideas about specialities in photochemistry for an organic chemist

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Summary

Introduction

This publication is dedicated to the memory of Thomas Bally, a wise and humorous colleague who passed away much too early in 2019. Thomas was a member of the Fribourg Chemistry Department, a colourful and stimulating group of chemists. I had always intense relations to some colleagues but do not exactly remember how this started. With discussions with Edwin Haselbach during photochemistry conferences, common work on textbooks with Daniel Belluš, or on manuscripts with Thomas Bally or Christian Bochet. Many of them were interested in photo excitation processes and photochemistry and I would like to present some ideas about specialities in photochemistry for an organic chemist.

Background
The Key Question in Organic Spin Photochemistry
More than one Triplet Product
More than one ISC Mechanism: Increasing HFC at the Expense of SOC
Findings
Yang cyclization
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