A ruthenium polypyridine complex [Ru(phen)2(IPBA)](PF6)2 (complex 1) (IPBA = 4-(1H-imidazo[4,5-f][1,9]phenanthroline-2-yl)benzaldehyde), which displays environment-responsive dual emissive properties, was designed and synthesized. In aprotic solvent, such as DMSO, DMF or CH3CN, the complex emits strong cyan light. When in protic solvent, it emits orange light. Similarly, the response of the complex to homocysteine and cysteine (Hcy/Cys) also shows obvious solvent dependence. TDDFT calculations reveal that the protonation of imidazole nitrogen in protic solution is responsible for the luminescent red shift. Hence, the complex could be used to detect Hcy/Cys in aprotic solvent, as well as in protic solvent.
一种
钌聚
吡啶配合物 [Ru(phen)2(IPBA)](PF6)2(复合物 1)(IPBA = 4-(1H-imidazo[4,5-f][1,9]苯并
芴-2-基)
苯甲醛)被设计和合成,表现出环境响应的双发射特性。在无质子溶剂中,如
DMSO、
DMF 或 CH3CN,该配合物发出强烈的青色光。当在质子溶剂中时,它发出橙色光。同样,该配合物对同型半胱
氨酸和半胱
氨酸(Hcy/Cys)的响应也显示出明显的溶剂依赖性。TDDFT 计算表明,在质子溶液中
咪唑氮的质子化导致了发光红移。因此,该配合物可以用于检测无质子溶剂和质子溶剂中的 Hcy/Cys。