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A Convenient Approach To Synthesize o-Carborane-Functionalized Phosphorescent Iridium(III) Complexes for Endocellular Hypoxia Imaging

机译:一种方便的方法合成邻碳硼烷功能化的磷铱(III)配合物用于细胞内缺氧成像

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摘要

The structure-property relationship of carborane-modified iridium(III) complexes was investigated. Firstly, an efficient approach for the synthesis of o-carborane-containing pyridine ligands a-f in high yields was developed by utilizing stable and cheap B10H10(Et4N)(2) as the starting material. By using these ligands, iridium(III) complexes I-VII were efficiently prepared. In combination with DFT calculations, the photophysical and electrochemical properties of these complexes were studied. The hydrophilic nido-o-carborane-based iridium(III) complex VII showed the highest phosphorescence efficiency (abs. phi P =0.48) among known water-soluble homoleptic cyclometalated iridium(III) complexes and long emission lifetime (=1.24s) in aqueous solution. Both of them are sensitive to O-2, and thus endocellular hypoxia imaging of complex VII was realized by time-resolved luminescence imaging (TRLI). This is the first example of applying TRLI in endocellular oxygen detection with a water-soluble nido-carborane functionalized iridium(III) complex.
机译:研究了碳硼烷修饰的铱(III)配合物的结构-性质关系。首先,通过利用稳定且廉价的B10H10(Et4N)(2)作为起始原料,开发了一种高产率地合成含邻甲烷的吡啶配体a-f的有效方法。通过使用这些配体,有效地制备了铱(III)配合物I-VII。结合DFT计算,研究了这些配合物的光物理和电化学性质。在已知的水溶性均化环金属化铱(III)络合物中,亲水性基于氨基-邻-甲碳烷的铱(III)络合物VII表现出最高的磷光效率(绝对phi P = 0.48),且在5,000℃下具有长发射寿命(= 1.24s)。水溶液。它们都对O-2敏感,因此通过时间分辨发光成像(TRLI)实现了复合物VII的胞内低氧成像。这是将TRLI与水溶性Nido-Carbane官能化的铱(III)配合物应用于细胞内氧气检测的第一个例子。

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