Search

We report herein a novel luminescent iridium(III) complex with two hydrophobic carbon chains as a non-reaction based chemosensor for the detection of Hg(2+) ions in aqueous solution (<0.002% of organic solvent attributed to the probe solution). Upon the addition of Hg(2+) ions, the emission intensity of the complex was significantly enhanced and this change could be monitored by the naked eye under UV irradiation. The iridium(III) complex shows high specificity for Hg(2+) ions over eighteen other cations. The system is capable of detecting micromolar levels of Hg(2+) ions, which is within the range of many chemical systems.

The effects of 36 organic compounds on luminol-KIO(4)-H(2)O(2) chemiluminescence (CL) were studied. It was found that most of the tested compounds could inhibit or enhance the CL intensity. The activities of such inhibitors or enhancers were related to the pH of the CL system and the number and position of functional groups such as -OH and -NH(2) on aromatic rings. The mechanism of the CL inhibition and enhancement was considered. Based on the CL inhibition or enhancement, the possibility of analytical applications was explored. The results demonstrated that numerous compounds were detectable at the ng/mL level using the CL system., (Copyright (c) 2006 John Wiley & Sons, Ltd.)

Main observation and conclusion: Engineering the surface of the metal clusters with the core structure maintained and tuning their luminescence in a wide range is still a challenge in the nanomaterial research. We modified six mono‐pyridyl ligands with different electronic effects (conjugation effect or induction effect) on a superatomic silver cluster [Ag14(C2B10H10S2)6(CH3CN)8] (denoted as Ag14) through in situ site‐specific surface engineering, and obtained the corresponding clusters [Ag14(C2B10H10S2)6(CH3CN)6(L1/L2)2] (denoted as NC‐1, 2, L1/L2 = 4‐acetylpyridine/ 4‐carboxypyridine) and [Ag14(C2B10H10S2)6(L3/L4/L5/L6)8] (denoted as NC‐3, 4, 5, 6, L3/L4/L5/L6 = 4‐phenylpyridine/4‐(1‐naphthyl)pyridine/9‐(4‐pyridine)anthracene/9‐(4‐pyridine)pyrene). Through the modification of the Ag14 cluster, a wide‐range luminescence from blue to red was realized. This work might provide a practical guide for improving the emission performance of metal clusters via surface engineering. [ABSTRACT FROM AUTHOR]

A long lifetime iridium(iii) complex chemosensor 1 for cysteine detection has been synthesized. The luminescence signal of 1 could be recognized in strongly fluorescent media through time-resolved emission spectroscopy (TRES). The detection of cysteine in a living zebrafish was demonstrated. [ABSTRACT FROM AUTHOR]

A novel luminescent cyclometalated iridium(iii) complex 1 was synthesized and employed as a chemosensor for the detection of Al3+ ions. Compared with common organic chemosensors, 1 displays a larger Stokes shift and a long lifetime luminescence that allow 1 to detect Al3+ ions in fluorescent dye spiked strong fluorescence media and potentially be used in strongly autofluorescent biological samples. [ABSTRACT FROM AUTHOR]

An iridium(iii) complex exhibiting higher responce towards i-motif DNA over dsDNA and ssDNA was employed for the construction of a TdT activity detection platform. The assay exhibited a linear signal enhancement for TdT in the concentration range of 0 to 8 U mL−1, and the limit of detection for TdT was 0.25 U mL−1. [ABSTRACT FROM AUTHOR]

We report herein a novel luminescent iridium(III) complex with two hydrophobic carbon chains as a non-reaction based chemosensor for the detection of Hg2+ ions in aqueous solution (<0.002% of organic solvent attributed to the probe solution). Upon the addition of Hg2+ ions, the emission intensity of the complex was significantly enhanced and this change could be monitored by the naked eye under UV irradiation. The iridium(III) complex shows high specificity for Hg2+ ions over eighteen other cations. The system is capable of detecting micromolar levels of Hg2+ ions, which is within the range of many chemical systems. [ABSTRACT FROM AUTHOR]

Highlights: [•] A luminescent probe for human serum albumin in aqueous solution has been developed. [•] A novel luminescence switch-on iridium(III) complex is reported. [•] The assay is selective for human serum albumin. [Copyright &y& Elsevier]

Highlights: [•] A luminescent Ir(III) complex has been found to be selective for G-quadruplex DNA. [•] The Ir(III) complex is highly selective for G-quadruplex DNA over ssDNA and dsDNA. [•] A label-free luminescent assay for 3′→5′ exonuclease activity has been developed. [Copyright &y& Elsevier]