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Contents Vol 64(5)

Cyclometalated Ir(iii) Complexes Containing Pyrazole/Pyrazine Carboxylate Ligands

Tanima Hajra A , Jitendra K. Bera A B and Vadapalli Chandrasekhar A B
+ Author Affiliations
- Author Affiliations

A Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India.

B Corresponding authors. Email: vc@iitk.ac.in; jbera@iitk.ac.in

Australian Journal of Chemistry 64(5) 561-566 https://doi.org/10.1071/CH11049
Submitted: 28 January 2011  Accepted: 22 March 2011   Published: 30 May 2011

Abstract

Two cyclometalated Ir(iii) complexes using 2-phenylpyridine (ppy-H) as the cyclometalating ligand, and pyrazole-3-carboxylic acid (prca-H) and pyrazine 3,5-dicarboxylic acid (pzdca-H2) as ancillary ligands; were synthesized from the chloro-bridged dimer precursor [{(ppy)2Ir}2(μ-Cl)2]. The title compounds [Ir(ppy)2(prca)] (1) and [{Ir(ppy)2}2(pzdca)] (2) are monomeric and dimeric neutral Ir(iii) complexes, respectively. Their electrochemical and photophysical properties were examined. They exhibit metal-based oxidations and ligand-based reductions. These complexes exhibit emission in the blue-green region with lifetimes in the micro-second range at room temperature. The nature of the emission spectra indicates differences in the origin of emission in these two compounds.


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