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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.50A [2011] >
IJC-A Vol.50A(09-10) [September-October 2011] >
| Title: | Cyclometalated Ir(III) complexes containing ancillary pyrazole-based ligands |
| Authors: | Hajra, Tanima
Ghosh, Soumya
Bera, Jitendra K
Chandrasekhar, Vadapalli |
| Keywords: | Coordination chemistry
Cyclometallated complexes
Pyrazoles
Iridium
Photophysical properties
Colour tuning
Luminescence |
| Issue Date: | Sep-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | A series of neutral mononuclear cyclometalated Ir(III)
complexes, [Ir(ppy)2(Me2pzH)Cl] (1), [Ir(ppy)2(MepzH)Cl] (2), [Ir(ppy)2(Mepz)(MepzH)] (3), [Ir(ppy)2(Phpz)(PhpzH)] (4), [Ir(ppy)2(NPpz)(NPpzH)] (5) and [Ir(ppy)2(NP-2-pz)(NP-2-pzH)] (6) [where ppyH =
2-phenylpyridine; Me2pzH = 3,5-dimethylpyrazole; MepzH =
3-methylpyrazole; PhpzH = 3-phenylpyrazole; NPpzH =
3-(1-naphthyl)pyrazole; NP-2-pzH = 3-(2-naphthyl)pyrazole) have been
synthesised and structurally characterised. While (1) and (2) contain
neutral pyrazole ligands which binds in a κ1
manner, in compounds (3)-(6), one of the pyrazole ligands is anionic while the other is
neutral. In the latter also the pyrazole ligands bind to the metal in a κ1 manner. Further, the two
types of pyrazoles interact with each other by H-bonded interaction. The
photophysical and electrochemical properties of all of these compounds have
been studied which reveal that the absorption/emission behaviour of these
compounds is dependent on the Ir(ppy)2 unit of the complexes; the ancillary
pyrazole ligands do not influence the photophysical behavior in any significant
manner. |
| Page(s): | 1290-1297 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.50A(09-10) [September-October 2011]
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