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.
Original language | English |
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Pages (from-to) | 159-162 |
Number of pages | 4 |
Journal | ChemPlusChem |
Volume | 85 |
Issue number | 1 |
Early online date | 14 Dec 2019 |
DOIs | |
Publication status | Published - 1 Jan 2020 |
Keywords
- antiferromagnetism
- magnetic properties
- multispin systems
- radicals
- Sonogashira coupling