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首页> 外文期刊>Chemistry: A European journal >Cationic iridium(III) complex containing both triarylboron and carbazole moieties as a ratiometric fluoride probe that utilizes a switchable triplet-singlet emission
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Cationic iridium(III) complex containing both triarylboron and carbazole moieties as a ratiometric fluoride probe that utilizes a switchable triplet-singlet emission

机译：包含三芳基硼和咔唑部分的阳离子铱（III）络合物作为比例式氟化物探针，利用可转换的三重态-单重态发射

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摘要

A novel cationic Ir~(III) complex [Ir(Bpq)_2(CzbpyCz)] PF_6 (Bpq = 2-[4-(dimesitylboryl)phenyl]quinoline, CzbpyCz = 5,5′-bis(9-hexyl-9H-carbazol-3-yl) -2,2′ -bipyridine) containing both triarylboron and carbazole moieties was synthesized. The excited-state properties of [Ir(Bpq)_2(CzbpyCz)]PF_6 were investigated through UV/Vis absorption and photoluminescence spectroscopy and molecular-orbital calculations. This complex displayed highly efficient orange-red phosphorescent emission with an emission peak of 583 nm and quantum efficiency of φ = 0.30 in dichloromethane at room temperature. The binding of fluoride ions to [Ir(Bpq)_2(CzbpyCz)]PF_6 can quench the phosphorescent emission from the Ir~(III) complex and enhance the fluorescent emission from the NN ligand, which corresponds to a visual change in the emission from orange-red to blue. Thus, both colorimetric and ratiometric fluoride sensing can be realized. Interestingly, an unusual intense absorption band in the visible region was observed. And the detection of F~- ions can also be carried out with visible light as the excitation wavelength. More importantly, the linear response of the probe absorbance change at λ= 351 nm versus the concentration of F~- ions allows efficient and accurate quantification of F~- ions in the range 0-50 μM.
机译：新型阳离子Ir〜（III）络合物[Ir（Bpq）_2（CzbpyCz）] PF_6（Bpq = 2- [4-（dimesitylboryl）phenyl] quinoline，CzbpyCz = 5,5'-bis（9-hexyl-9H-合成了同时含有三芳基硼和咔唑部分的咔唑-3-基）-2,2'-联吡啶）。通过紫外/可见吸收和光致发光光谱以及分子轨道计算研究了[Ir（Bpq）_2（CzbpyCz）] PF_6的激发态性质。在室温下，该络合物显示出高效的橙红色磷光发射峰，发射峰为583 nm，量子效率为φ= 0.30。氟离子与[Ir（Bpq）_2（CzbpyCz）] PF_6的结合可以淬灭Ir〜（III）配合物的磷光发射，并增强NN配体的荧光发射，这对应于来自NN配体的视觉变化橙红色至蓝色。因此，可以实现比色和比例氟化物感测。有趣的是，在可见光区域观察到了异常强烈的吸收带。而且，也可以用可见光作为激发波长来进行F离子的检测。更重要的是，在λ= 351 nm处探针吸光度变化与F〜-离子浓度的线性响应，可以在0-50μM范围内对F〜-离子进行高效，准确的定量。

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