Redox Modulation of para-Phenylenediamine by Substituted Nitronyl Nitroxide Groups and Their Spin States

详细信息    查看全文

• 作者：Akihiro Ito ; Ryohei Kurata ; Daisuke Sakamaki ; Soichiro Yano ; Yosuke Kono ; Yoshiaki Nakano ; Ko Furukawa ; Tatsuhisa Kato ; Kazuyoshi Tanaka
• 刊名：Journal of Physical Chemistry A
• 出版年：2013
• 出版时间：December 5, 2013
• 年：2013
• 卷：117
• 期：48
• 页码：12858-12867
• 全文大小：580K
• 年卷期：v.117,no.48(December 5, 2013)
• ISSN：1520-5215

文摘

Three kinds of para-phenylenediamine (PDA) derivatives bearing nitronyl nitroxide (NN) groups were prepared and characterized on the basis of the electrochemical, electron spin resonance (ESR) spectroscopic, absorption spectroscopic, and magnetic susceptibility measurements. It was clarified that the oxidation potential of the central PDA unit is strongly influenced by the numbers of substituted electron鈥搘ithdrawing NN groups. In addition, the intervalence charge transfer in the central PDA unit was detected in the monocationic states of the PDAs with two NN groups, indicating the coexistence of the localized spins and the delocalized spin on theses molecules. Moreover, pulsed ESR measurements confirmed that the delocalized spin on the central PDA unit and the localized two spins on the NN groups were ferromagnetically coupled in the monocationic states.