六芳基联咪唑(Hexaarylbiimidazole,HABI)的光致变色效应,是1960年Hayashi和Maeda在研究2,4,5-三苯基咪唑氧化时产生化学发光的过程中偶然发现的.作为一类新型光致变色分子,HABI同时具有光致变色、热致变色以及压致变色特性.其变色机理是光照打断HABI分子中两个咪唑环之间的C N化学键,产生两分子三苯基咪唑自由基(triphenylimidazole radical,TPIR).由于HABI在变色后形成的有色态(TPIR)褪色比较慢(半衰期τl/2为几分钟到几十分钟),同时生成的自由基比较活泼,容易发生不可逆副反应,使得其作为光致变色材料的抗疲劳性较差.近十几年,Jiro Abe课题组提出桥联绑定两个三苯基咪唑的构想,使得HABI的光致变色逆反应的半衰期由数分钟降低到几十微秒,尤其是近期,改性后的HABI成功运用于实时全息成像,显示了HABI作为新型光致变色材料的美好前景.本课题组在前人研究基础上,将HBAI的光致变色效应发展成荧光分子开关,设计合成出具有荧光分子开关性能的HABI并加以优化,成功地运用于超分辨成像.基于HABI的荧光分子开关及其新兴光学应用有望成为分子开关研究的新热点.
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