A transparent film allowing tunable multicolor emission based on a composite of an organometallic compound and a cation-exchange membrane has been developed, in which the cyclometallated iridium(III) complex [Ir^III(4Py-ppy)₃] (=tris[2-(2-pyridinyl-κN)-4-(4-pyridinyl)phenyl-κC]iridium) (1) with pH-dependent emission wavelengths has been incorporated into Nafion by cation exchange. Soaking Nafion in the solution of 1 for 24 h and exposed to buffers at pH 2, 4, and 10 resulted in maximum emission wavelengths of 587, 560, and 503 nm, respectively. The photophysical properties of 1@Nafion were also enhanced, as its maximum emission wavelength was more blue-shifted than those of 602, 564, and 503 nm in the solutions. The emission quantum yields (Φ) and lifetimes (τ) of 1@Nafion prepared under an acidic condition were up to Φ = 1.8% and τ = 0.11, 0.92 μs, which are considerably higher than the corresponding solutions of Φ = 0.5% and τ = 0.02, 0.18 μs. This is attributed to the fact that 1 is surrounded by the polymer chains of Nafion and immobilized in a relatively rigid medium, which hinders non-radiative deactivation such as thermal relaxation.

中文翻译：

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透明阳离子交换膜中质子响应性环金属化铱（III）配合物的多色发射和光物理性质

基于有机金属化合物和阳离子交换膜的复合材料，开发了一种可调节多色发射的透明膜，其中环金属化铱（III）络合物[Ir ^III（4Py-ppy）₃ ]（= tris [2- （2-吡啶基-κ ñ）-4-（4-吡啶基）苯基κ ç ]铱）（1）具有pH依赖性发射波长已经通过阳离子交换掺入的Nafion。将Nafion在1的溶液中浸泡24小时，并暴露于pH 2、4和10的缓冲液中，分别导致最大发射波长为587、560和503 nm。1的光物理性质Nafion也得到了增强，因为其最大发射波长比溶液中602、564和503 nm的最大发射波长蓝移。在酸性条件下制备的1 @Nafion的发射量子产率（Φ）和寿命（τ）分别高达Φ = 1.8％和τ = 0.11、0.92μs ，远高于相应的Φ = 0.5％和τ = 0.02，0.18μs。这归因于以下事实：1被Nafion的聚合物链包围并固定在相对刚性的介质中，这阻碍了非辐射失活，例如热弛豫。