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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
Photophysical properties
Colour tuning
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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