A Weakly Antiferromagnetically Coupled Biradical Combining Verdazyl with Nitronylnitroxide Units / P. V. Petunin, T. A. Rybalova, M. E. Trusova [et al.]
Уровень набора: ChemPluscHhemЯзык: английский.Страна: .Резюме или реферат: 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..Примечания о наличии в документе библиографии/указателя: [References: 21 tit.].Аудитория: .Тематика: электронный ресурс | труды учёных ТПУ | бирадикалы | растворы | обменные взаимодействия | кристаллизация Ресурсы он-лайн:Щелкните здесь для доступа в онлайнTitle screen
[References: 21 tit.]
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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