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Iridium(III)porphyrin arrays with tuneable photophysical properties.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2020-03-29 , DOI: 10.1016/j.saa.2020.118309 M Cidália R Castro 1 , Nabiha Ben Sedrine 2 , Teresa Monteiro 2 , Ana V Machado 1
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2020-03-29 , DOI: 10.1016/j.saa.2020.118309 M Cidália R Castro 1 , Nabiha Ben Sedrine 2 , Teresa Monteiro 2 , Ana V Machado 1
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The photophysical properties of iridium(III) porphyrins complexes with two different axial ligands (Cl(CO) and bipyridine (bpy)) in solution and in cellulose acetate polymer matrix were investigated. The axial ligands substitution was made aiming to evaluate the photophysical properties and the solubility in different solvents. Therefore, dissimilar from the free porphyrin, non-polar solvents (as toluene) favours the quantum yield of iridium(III)porphyrins and ligands with a more extended π-conjugated compound as bpy results in higher yields. Moreover, despite all the porphyrins reveals a negative solvatochromism, the substitution of Cl(CO) ligand by bpy ligand exhibits similar solubility either on non-polar or polar solvents. The observed photoluminescence (PL) at room temperature appears at NIR region in contrast to the previously reported iridium(III) porphyrins. Comparing with free porphyrin H2TTP, the red/NIR PL spectra of the iridium(III)porphyrins (either in solution and in the polymer matrix) reveals remarkable changes. Particularly, a more significative decrease of the red/NIR intensity ratio was detected for [Ir(ttp)(bpy)2] 2 where the maxima of the NIR emission can be adjusted under suitable excitation wavelength.
中文翻译：
具有可调节光物理性质的铱（III）卟啉阵列。
研究了具有两种不同轴向配体（Cl（CO）和联吡啶（bpy））的铱（III）卟啉配合物在溶液中和在醋酸纤维素聚合物基质中的光物理性质。进行轴向配体取代是为了评估光物理性质和在不同溶剂中的溶解度。因此，与游离卟啉不同，非极性溶剂（如甲苯）有利于铱（III）卟啉和具有更扩展的π共轭化合物的配体的量子产率，因为bpy的产率更高。此外，尽管所有卟啉均显示出负溶剂溶剂变色现象，但用bpy配体取代Cl（CO）配体在非极性或极性溶剂上均显示出相似的溶解度。与先前报道的铱（III）卟啉相反，室温下观察到的光致发光（PL）出现在NIR区域。与游离卟啉H2TTP相比，铱（III）卟啉的红色/ NIR PL光谱（在溶液中和在聚合物基质中）均显示出显着变化。特别地，对于[Ir（ttp）（bpy）2] 2检测到红色/ NIR强度比的更显着降低，其中可以在合适的激发波长下调节NIR发射的最大值。
更新日期：2020-03-31
中文翻译：
具有可调节光物理性质的铱（III）卟啉阵列。
研究了具有两种不同轴向配体（Cl（CO）和联吡啶（bpy））的铱（III）卟啉配合物在溶液中和在醋酸纤维素聚合物基质中的光物理性质。进行轴向配体取代是为了评估光物理性质和在不同溶剂中的溶解度。因此，与游离卟啉不同，非极性溶剂（如甲苯）有利于铱（III）卟啉和具有更扩展的π共轭化合物的配体的量子产率，因为bpy的产率更高。此外，尽管所有卟啉均显示出负溶剂溶剂变色现象，但用bpy配体取代Cl（CO）配体在非极性或极性溶剂上均显示出相似的溶解度。与先前报道的铱（III）卟啉相反，室温下观察到的光致发光（PL）出现在NIR区域。与游离卟啉H2TTP相比，铱（III）卟啉的红色/ NIR PL光谱（在溶液中和在聚合物基质中）均显示出显着变化。特别地，对于[Ir（ttp）（bpy）2] 2检测到红色/ NIR强度比的更显着降低，其中可以在合适的激发波长下调节NIR发射的最大值。
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