Preparation of Multi-Spin Systems: A Case Study of Tolane-Bridged Verdazyl-Based Hetero-Diradicals

Darya E. Votkina, Pavel V. Petunin, Svetlana I. Zhivetyeva, Irina Yu Bagryanskaya, Mikhail N. Uvarov, Maxim S. Kazantsev, Marina E. Trusova, Evgeny V. Tretyakov, Pavel S. Postnikov

Research output: Contribution to journalArticle

Abstract

Iodine- and ethynyl-containing 'Kuhn'-verdazyls, oxoverdazyls, and nitronyl nitroxides were investigated as building blocks for the preparation of multi-spin systems via the Sonogashira reaction, and, as a result, eleven diradicals were prepared with fair yields. The reactivity of the building blocks indicates that oxoverdazyl iodides are effective starting components for the synthesis of diradicals via the Sonogashira coupling. The described one-step protocol allows combining different spin units, thereby facilitating the design of tolane-bridged diradicals and screening of their properties. The novel compounds were characterized by cyclic voltammetry, UV/Vis and electron spin resonance (ESR) spectroscopy. Although the electrochemical investigation and electronic spectra showed a negligible influence of radical moieties on each other, ESR data revealed a strong exchange interaction between two unpaired electrons. The prepared verdazyl-nitronylnitroxide diradicals have high stability at storage and hold promise for further investigation and application.

Original languageEnglish
Pages (from-to)1996-2004
Number of pages9
JournalEuropean Journal of Organic Chemistry
Volume2020
Issue number13
DOIs
Publication statusPublished - 7 Apr 2020

Keywords

  • Cross-coupling
  • Multi-spin systems
  • Nitroxides
  • Radicals
  • Synthesis design

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry

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