Spin-Carrying Benzoquinone Derivatives

详细信息    查看全文

• 作者：Shin’ ; ichi Nakatsuji ; Mitsunori Nobusawa ; Hideto Suzuki ; Hiroki Akutsu ; Jun-ichi Yamada
• 刊名：Journal of Organic Chemistry
• 出版年：2009
• 出版时间：December 18, 2009
• 年：2009
• 卷：74
• 期：24
• 页码：9345-9350
• 全文大小：841K
• 年卷期：v.74,no.24(December 18, 2009)
• ISSN：1520-6904

文摘

Several 1,4-benzoquinone derivatives carrying oxy-TEMPO radical(s) at the 2-position or 2,5-positions were found to give black crystals by recrystallization from pale yellow solutions and it was revealed from their crystal structures that unusual single-component CT complexes were formed, in which a nitroxide moiety plays the roll of a donor part and a 1,4-benzoquinone group of the same molecule works as an acceptor part, respectively. On the contrary, no CT formation was found for the derivatives carrying oxy-TEMPO radicals at 2,6-positions and one of the TEMPO groups contributes to a CT formation in a 1,4-benzoquinone derivative carrying amino-TEMPO radicals at 2,5-positions derived from fluoranil, while the other one has a close oxygen-to-oxygen contact with another neighboring molecule to give a very large exchange coupling of J/k_B = −154 K.