| Content Provider |
World Health Organization (WHO)-Global Index Medicus |
| Author |
Fiorini, Valentina Zanotti, Valerio Massi, Massimiliano Raiteri, Paolo Zacchini, Stefano Mazzoni, Rita Stagni, Stefano |
| Description |
Author Affiliation: Fiorini V ( Department of Industrial Chemistry 'Toso Montanari', University of Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy. valentina.fiorini5@unibo.it stefano.stagni@unibo.it.); Zacchini S ( Department of Industrial Chemistry 'Toso Montanari', University of Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy. valentina.fiorini5@unibo.it stefano.stagni@unibo.it.); Raiteri P ( Department of Chemistry and Nanochemistry Research Institute, Curtin University, GPO Box U 1987, Perth, 6845, Australia. M.Massi@curtin.edu.au and Curtin Institute for Computation, Curtin University, GPO Box U 1987, Perth, 6845, Australia.); Mazzoni R ( Department of Industrial Chemistry 'Toso Montanari', University of Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy. valentina.fiorini5@unibo.it stefano.stagni@unibo.it.); Zanotti V ( Department of Industrial Chemistry 'Toso Montanari', University of Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy. valentina.fiorini5@unibo.it stefano.stagni@unibo.it.); Massi M ( Department of Chemistry and Nanochemistry Research Institute, Curtin University, GPO Box U 1987, Perth, 6845, Australia. M.Massi@curtin.edu.au.); Stagni S ( Department of Industrial Chemistry 'Toso Montanari', University of Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy. valentina.fiorini5@unibo.it stefano.stagni@unibo.it.) |
| Abstract |
The bis-tetrazolate dianion [1,2 $BTB]^{2−},$ which is the deprotonated form of 1,2 bis-(1H-tetrazol-5-yl)benzene $[1,2-H_{2}BTB],$ is for the first time exploited as an ancillary N^N ligand for negatively charged $[Ir(C\^N)_{2}(N\^N)]^{−}-type$ complexes, where C^N is represented by cyclometalated 2-phenylpyridine (ppy) or 2-(2,4-difluorophenyl)pyridine $(F_{2}ppy).$ The new Ir(III) complexes $[Ir(ppy)_{2}(1,2$ $BTB)]^{−}$ and $[Ir(F_{2}ppy)_{2}(1,2$ $BTB)]^{−}$ have been fully characterised and the analysis of the X-ray structure of $[Ir(ppy)_{2}(1,2$ $BTB)]^{−}$ confirmed the coordination of the [1,2 $BTB]^{2−}$ dianion in a bis chelated fashion through the N-atoms adjacent to each of the tetrazolic carbons. Both of the new anionic Ir(III) complexes displayed phosphorescence in the visible region, with intense sky-blue $(λ_{max}$ = 460–490 nm) or aqua $(λ_{max}$ = 490–520 nm) emissions originating from $[Ir(F_{2}ppy)_{2}(1,2$ $BTB)]^{−}$ and $[Ir(ppy)_{2}(1,2$ $BTB)]^{−},$ respectively. In comparison with our very recent examples of anionic Ir(III)tetrazolate cyclometalates, the new Ir(III) tris chelate complexes $[Ir(F_{2}ppy)_{2}(1,2$ $BTB)]^{−}$ and $[Ir(ppy)_{2}(1,2$ $BTB)]^{−},$ display an improved robustness, allowing the study of their reactivity toward the addition of electrophiles such as $H^{+}$ and $CH_{3}^{+}.$ In all cases, the electrophilic attacks occurred at the coordinated tetrazolate rings, involving the reversible – by a protonation deprotonation mechanism – or permanent – upon addition of a methyl moiety – switching of their global net charge from negative to positive and, in particular, the concomitant variation of their photoluminescence output. The combination of the anionic complexes $[Ir(F_{2}ppy)_{2}(1,2$ $BTB)]^{−}$ or $[Ir(ppy)_{2}(1,2$ $BTB)]^{−}$ with a deep red emitting $(λ_{max}$ = 686 nm) cationic Ir(III) tetrazole complex such as $[IrTPYZ-Me]^{+},$ where TPYZ-Me is 2-(2-methyl-2H-tetrazol-5-yl)pyrazine, gave rise to two fully Ir(III)-based soft salts capable of displaying additive and $O_{2}-sensitive$ emission colours, with an almost pure white light obtained by the appropriate choice of the ionic components. |
| ISSN |
14779226 |
| Issue Number |
32 |
| Journal |
Dalton Trans. |
| Volume Number |
45 |
| e-ISSN |
13645447 |
| Language |
English |
| Publisher |
Royal Society of Chemistry |
| Publisher Date |
2016-08-09 |
| Publisher Place |
Great Britain (UK) |
| Access Restriction |
Subscribed |
| Subject Keyword |
Chemistry |
| Content Type |
Text |
| Resource Type |
Article |
| Subject |
Inorganic Chemistry |
