Preparation and properties of 4-amino-TEMPO-substituted benzoquinone derivatives and related charge-transfer complexes
作者:Shin'ichi Nakatsuji、Nobutaka Akashi、Kazuya Suzuki、Toshiaki Enoki、Hiroyuki Anzai
DOI:10.1039/p29960002555
日期:——
The reaction of DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone) with 4-amino-TEMPO (4-amino-2,2,6,6-tetramethylpiperidin-1-yloxyl) led to the 5-(4-amino-TEMPO)-substituted benzoquinone derivative 2 as the main product with the replacement of one cyano group, whereas bis(4-aminoTEMPO)-substituted benzoquinone derivatives 4 or 5 were obtained as the main products in the reaction of chloranil or bromanil with 4-amino-TEMPO under the same reaction conditions. The benzoquinone acceptor 2 formed charge-transfer complexes with the donors such as TTF (tetrathiafulvalene) or the 4-hydroxy-TEMPO-substituted TTF derivative, showing weak anti-ferromagnetic interactions in the complexes.
DDQ (2,3-二氯-5,6-二氰基-1,4-苯醌) 与 4-氨基-TEMPO (4-氨基-2,2,6,6-四甲基哌啶-1-氧基自由基) 反应,主要生成取代了一个氰基的 5-(4-氨基-TEMPO) 苯醌衍生物 2。而在相同反应条件下,氯醌或溴醌与 4-氨基-TEMPO 反应,主要生成双(4-氨基TEMPO) 取代的苯醌衍生物 4 或 5。苯醌受体 2 与供体如 TTF (四硫富瓦烯) 或 4-羟基-TEMPO 取代的 TTF 衍生物形成电荷转移复合物,表现出弱的反铁磁相互作用。