Alam Parvej, Kaur Gurpreet, Climent Clàudia, Pasha Saleem, Casanova David, Alemany Pere, Choudhury Angshuman Roy, Laskar Inamur Rahaman
Department of Chemistry, Birla Institute of Technology and Science, Pilani Campus, Pilani, Rajasthan, India.
Dalton Trans. 2014 Nov 21;43(43):16431-40. doi: 10.1039/c4dt02266a.
Design and syntheses of 'aggregation induced emission (AIE)' active blue-emitting bis-cyclometalated iridium(III) complexes with appended diphosphine ligands [Ir(F2ppy)2(L1/L2)2(Cl)] (F2ppy = 2-(2',4'-difluoro) phenylpyridine; L1 = 1,2-bis(diphenylphosphino)ethane; L2 = bis(diphenylphosphino)propane) have been realized on a suitable route. The free phosphorous donor atom present on the appended diphosphine is shown to provide selective binding to the mercuric ion (Hg(2+)). The selective binding ability of the probe molecule towards mercuric ions results in a detectable signal due to complete quenching of their AIE properties. The quenching effect of the probe molecule has been explored and found to be the result of the degradation of the probe iridium(III) complex triggered by the presence of mercuric ions due to an interplay of a soft-soft interaction between the free phosphorous atom of the probe molecule and mercuric ions. These complexes were modelled to obtain deeper understanding of excited state properties and the results were tentatively correlated with the experimental data.
通过合适的路线实现了具有附加二膦配体的“聚集诱导发光（AIE）”活性蓝色发射双环金属化铱（III）配合物[Ir(F2ppy)2(L1/L2)2(Cl)]（F2ppy = 2-(2',4'-二氟)苯基吡啶；L1 = 1,2-双(二苯基膦基)乙烷；L2 = 双(二苯基膦基)丙烷）的设计与合成。结果表明，附加二膦上存在的游离磷供体原子能够与汞离子（Hg(2+)）发生选择性结合。由于其AIE性质完全猝灭，探针分子对汞离子的选择性结合能力导致了可检测的信号。对探针分子的猝灭效应进行了研究，发现这是由于探针分子的游离磷原子与汞离子之间的软-软相互作用，在汞离子存在的情况下引发了探针铱（III）配合物的降解。对这些配合物进行了建模，以更深入地了解其激发态性质，并将结果与实验数据进行了初步关联。
