Three new heteroleptic cationic iridium complexes of the form [Ir(C^N)(btl)]+, where btl = 1,1′-benzyl-4,4′-bi-1H-1,2,3-triazolyl and C^N = 2-phenylpyridine (ppyH) (1), 1-benzyl-4-phenyl-1H-1,2,3-triazole (phtl) (2) or 1-benzyl-4-(2,4-difluorophenyl)-1H-1,2,3-triazole (dFphtl) (3), were synthesized and isolated as their hexafluorophosphate (PF6−) salts and fully characterized. The single crystal structure of 3 has been solved. Along the series from 1–3 the absorption spectra shift hypsochromically while the electrochemical gap increases from 3.25 to 3.54 to 3.88 V. Acetonitrile solutions of 1 and 2 are poorly luminescent, sky-blue emitters with predominant ligand-centered and charge transfer character, respectively. Theoretical calculations support these assignments. Complex 3 is not photostable and decomposes to solvento-based structures of the form [Ir(dFphtl)2(ACN)n]+ (n = 1, 2) through a dissociation and degradation of the btl ligand.
三种新型异
配体阳离子
铱络合物的形式为[Ir(C^N)(btl)]+,其中btl = 1,1′-苄基-4,4′-双-1H-
1,2,3-三嗪基,C^N =
2-苯基吡啶 (ppyH) (1),1-苄基-4-苯基-1H-
1,2,3-三嗪 (phtl) (2)或1-苄基-4-(2,4-二
氟苯基)-1H-
1,2,3-三嗪 (dFphtl) (3),已被合成并以其
六氟磷酸盐 (PF6−) 形式分离,且已进行全面表征。复合物3的单晶结构已被解析。在1到3的系列中,吸收光谱向高能端移动,而电
化学带隙从3.25 V增至3.54 V,再增至3.88 V。1和2的
乙腈溶液发光较弱,呈天蓝色,主要表现为
配体中心和电荷转移特性,理论计算支持这些分配。复合物3不耐光照,分解为溶剂基结构[Ir(dFphtl)2(ACN)n]+ (n = 1, 2),通过btl
配体的解离和降解过程生成。