Aggregation-Induced Electrochemiluminescence from a Cyclometalated Iridium(III) Complex.

Title Aggregation-Induced Electrochemiluminescence from a Cyclometalated Iridium(III) Complex.
Authors T.B. Gao; J.J. Zhang; R.Q. Yan; D.K. Cao; D. Jiang; D. Ye
Journal Inorg Chem
DOI 10.1021/acs.inorgchem.7b03093

Aggregation-induced emission has been extensively found in organic compounds and metal complexes. In contrast, aggregation-induced electrochemiluminescence (AI-ECL) is rarely observed. Here, we employ two tridentate ligands to construct a cyclometalated iridium(III) complex, [Ir(tpy)(bbbi)] (1), showing strong AI-ECL. Its crystal structure indicates that neighboring [Ir(tpy)(bbbi)] molecules are connected through both ?-?-stacking interactions and hydrogen bonds. These supramolecular interactions can facilitate the self-assembly of complex 1 into nanoparticles in an aqueous solution. The efficient restriction of molecular vibration in these nanoparticles leads to strong AI-ECL emission of complex 1. In a dimethyl sulfoxide-water (HO) mixture with a gradual increase in the HO fraction from 20% to 98%, complex 1 showed a ?39-fold increase in the electrochemiluminescence (ECL) intensity, which was ?4.04 times as high as that of [Ru(bpy)] under the same experimental conditions. Moreover, the binding of bovine serum albumin to the nanoparticles of complex 1 can improve the ECL emission of this complex, facilitating the understanding of the mechanism of AI-ECL for future applications.

Citation T.B. Gao; J.J. Zhang; R.Q. Yan; D.K. Cao; D. Jiang; D. Ye.Aggregation-Induced Electrochemiluminescence from a Cyclometalated Iridium(III) Complex.. Inorg Chem. 2018;57(8):43104316. doi:10.1021/acs.inorgchem.7b03093

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See more Iridium products. Iridium (atomic symbol: Ir, atomic number: 77) is a Block D, Group 9, Period 6 element with an atomic weight of 192.217. The number of electrons in each of iridium's shells is [2, 8, 18, 32, 15, 2] and its electron configuration is [Xe] 4f14 5d7 6s2. Iridium Bohr ModelThe iridium atom has a radius of 136 pm and a Van der Waals radius of 202 pm. Iridium was discovered and first isolated by Smithson Tennant in 1803. In its elemental form, Iridium has a silvery white appearance. Iridium is a member of the platinum group of metals.Elemental Iridium It is the most corrosion resistant metal known and is the second-densest element (after osmium). It will not react with any acid and can only be attacked by certain molten salts, such as molten sodium chloride. Iridium is found as an uncombined element and in iridium-osmium alloys. Iridium's name is derived from the Greek goddess Iris, personification of the rainbow, on account of the striking and diverse colors of its salts.

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