Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/12796
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)<sub>2</sub>(Me<sub>2</sub>pzH)Cl] (<b style="">1</b>),<b style=""> </b>[Ir(ppy)<sub>2</sub>(MepzH)Cl] (<b style="">2</b>),<b style=""> </b>[Ir(ppy)<sub>2</sub>(Mepz)(MepzH)] (<b style="">3</b>), [Ir(ppy)<sub>2</sub>(Phpz)(PhpzH)] (<b style="">4</b>), [Ir(ppy)<sub>2</sub>(NPpz)(NPpzH)] (<b style="">5</b>) and [Ir(ppy)<sub>2</sub>(NP-2-pz)(NP-2-pzH)] (<b style="">6</b>) [where ppyH = 2-phenylpyridine; Me<sub>2</sub>pzH = 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 (<b style="">1</b>) and (<b style="">2</b>) contain neutral pyrazole ligands which binds in a <i style="">κ<sup>1</sup> </i>manner, in compounds (<b style="">3</b>)<b style="">-</b>(<b style="">6</b>), 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 <i style="">κ<sup>1</sup></i> 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)<sub>2</sub> unit of the complexes; the ancillary pyrazole ligands do not influence the photophysical behavior in any significant manner.
Description: 1290-1297
URI: http://hdl.handle.net/123456789/12796
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(09-10) [September-October 2011]

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