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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Wu, Yu-hui Zhao, Na Chen, Zhong-ning Shi, Lin-xi Lin, Qi-pu |
| Description | Author Affiliation: Zhao N ( State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.) |
| Abstract | An iridium(III)-containing phosphorescent chemosensor $Ir(ppy)_{2}(L)(PF_{6})$ (1, ppy = 2-phenylpyridine ) containing a 2,2′-bipyridyl ligand (L) functionalized with an α,β-unsaturated ketone for selective detection of thiol was synthesized and characterized by spectroscopic and photophysical measurements. The structure of complex 1 was determined by X-ray crystallography . In order to get an insight into 1,4-addition reactions of thiol to complex 1, the adduct 2 from reaction of 1 with benzenethiol was successfully prepared and characterized. Complex 1 shows a lowest energy absorption at ca. 450 nm, primarily ascribable to an intraligand charge transfer (ILCT) transition from the HOMO (π) resident on the fragment $-C(O)C_{6}H_{4}N(C_{2}H_{5})_{2}$ to the LUMO (π*) localized on the 2,2′-bipyridyl moiety in the functionalized 2,2′-bipyridyl ligand as suggested from DFT computational studies. Complex 1 is weakly emissive at ca. 587 nm at ambient temperature, arising likely from the $^{3}ILCT$ excited state. Upon addition of thiol to a semi-aqueous solution of complex 1, the lowest energy absorption is obviously blue-shifted and the emission is remarkably enhanced due probably to a conversion from the primary ILCT state to the predominant [ π(ppy)→π*(L) ] LLCT and the [ 5d(Ir)→π*(L) ] MLCT state caused by the formation of the 1-thiol adduct. The sensing properties of 1 to thiol were also investigated by ESI-MS spectrometry and $^{1}H$ NMR spectroscopy . |
| ISSN | 14779226 |
| Issue Number | 35 |
| Volume Number | 39 |
| e-ISSN | 13645447 |
| Journal | Dalton Trans. |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Publisher Date | 2010-09-21 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Subscribed |
| Subject Keyword | 2,2'-Dipyridyl Chemistry Coordination Complexes Iridium Sulfhydryl Compounds Chemical Synthesis Crystallography, X-Ray Fluorescent Dyes Ligands Magnetic Resonance Spectroscopy Molecular Conformation Quantum Theory Spectrometry, Mass, Electrospray Ionization Spectrophotometry, Ultraviolet Journal Article Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Inorganic Chemistry |
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