A Weakly Antiferromagnetically Coupled Biradical Combining Verdazyl with Nitronylnitroxide Units

Pavel V. Petunin, Tatyana V. Rybalova, Marina E. Trusova, Mikhail N. Uvarov, Maxim S. Kazantsev, Evgeny A. Mostovich, Lars Postulka, Paul Eibisch, Bernd Wolf, Michael Lang, Pavel S. Postnikov, Martin Baumgarten

Research School of Chemistry & Applied Biomedical Sciences

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

An antiferromagnetically (AFM) coupled biradical based on oxoverdazyl and nitronylnitroxide was synthesized in 46 % yield using Sonogashira coupling. The obtained heterobiradical evidenced distinct properties of both radical entities in solution. Depending on the solvent, the prepared biradical crystallized in two different forms. SQUID magnetization measurements on Form II showed coupling constants J_intraII/k_B=−2.1 K and zJ_interII/k_B=−11.5 K. Consequently, total intermolecular exchange interactions are five times larger than the intramolecular ones. Further, DFT calculations explained this phenomenon and indicated the advantage of Form I for further in-depth investigations.

Original language	English
Pages (from-to)	159-162
Number of pages	4
Journal	ChemPlusChem
Volume	85
Issue number	1
DOIs	https://doi.org/10.1002/cplu.201900709
Publication status	Published - 1 Jan 2020

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Keywords

antiferromagnetism
magnetic properties
multispin systems
radicals
Sonogashira coupling

ASJC Scopus subject areas

Chemistry(all)

Cite this

Petunin, P. V., Rybalova, T. V., Trusova, M. E., Uvarov, M. N., Kazantsev, M. S., Mostovich, E. A., Postulka, L., Eibisch, P., Wolf, B., Lang, M., Postnikov, P. S., & Baumgarten, M. (2020). A Weakly Antiferromagnetically Coupled Biradical Combining Verdazyl with Nitronylnitroxide Units. ChemPlusChem, 85(1), 159-162. https://doi.org/10.1002/cplu.201900709

A Weakly Antiferromagnetically Coupled Biradical Combining Verdazyl with Nitronylnitroxide Units. / Petunin, Pavel V.; Rybalova, Tatyana V.; Trusova, Marina E.; Uvarov, Mikhail N.; Kazantsev, Maxim S.; Mostovich, Evgeny A.; Postulka, Lars; Eibisch, Paul; Wolf, Bernd; Lang, Michael; Postnikov, Pavel S.; Baumgarten, Martin.

In: ChemPlusChem, Vol. 85, No. 1, 01.01.2020, p. 159-162.

Research output: Contribution to journal › Article

Petunin, Pavel V. ; Rybalova, Tatyana V. ; Trusova, Marina E. ; Uvarov, Mikhail N. ; Kazantsev, Maxim S. ; Mostovich, Evgeny A. ; Postulka, Lars ; Eibisch, Paul ; Wolf, Bernd ; Lang, Michael ; Postnikov, Pavel S. ; Baumgarten, Martin. / A Weakly Antiferromagnetically Coupled Biradical Combining Verdazyl with Nitronylnitroxide Units. In: ChemPlusChem. 2020 ; Vol. 85, No. 1. pp. 159-162.

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abstract = "An antiferromagnetically (AFM) coupled biradical based on oxoverdazyl and nitronylnitroxide was synthesized in 46 % yield using Sonogashira coupling. The obtained heterobiradical evidenced distinct properties of both radical entities in solution. Depending on the solvent, the prepared biradical crystallized in two different forms. SQUID magnetization measurements on Form II showed coupling constants JintraII/kB=−2.1 K and zJinterII/kB=−11.5 K. Consequently, total intermolecular exchange interactions are five times larger than the intramolecular ones. Further, DFT calculations explained this phenomenon and indicated the advantage of Form I for further in-depth investigations.",

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AU - Rybalova, Tatyana V.

AU - Trusova, Marina E.

AU - Uvarov, Mikhail N.

AU - Kazantsev, Maxim S.

AU - Mostovich, Evgeny A.

AU - Postulka, Lars

AU - Eibisch, Paul

AU - Wolf, Bernd

AU - Lang, Michael

AU - Postnikov, Pavel S.

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AB - An antiferromagnetically (AFM) coupled biradical based on oxoverdazyl and nitronylnitroxide was synthesized in 46 % yield using Sonogashira coupling. The obtained heterobiradical evidenced distinct properties of both radical entities in solution. Depending on the solvent, the prepared biradical crystallized in two different forms. SQUID magnetization measurements on Form II showed coupling constants JintraII/kB=−2.1 K and zJinterII/kB=−11.5 K. Consequently, total intermolecular exchange interactions are five times larger than the intramolecular ones. Further, DFT calculations explained this phenomenon and indicated the advantage of Form I for further in-depth investigations.

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KW - magnetic properties

KW - multispin systems

KW - radicals

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10.1002/cplu.201900709