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Updated: Sep 15, 2025
IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
Published on: July 7, 2015
Coordination polymers with iridium(III) metalloligands: the effect of pore size upon luminescent cation sensing
Zhejun Hong1, Pattara Siripanich1, Oliver G Stansfield2
1School of Chemistry, The University of Melbourne, Parkville, Victoria, 3010, Australia. carol.hua@unimelb.edu.au.
Abstract:
The chemical sensing of metal ions is important in environmental monitoring and biomedical diagnostics. Iridium(III) metalloligand-based coordination polymers (CPs) containing Cd(II): [Cd{Ir(ppy)2(dcbpy)}2] (1), [Cd{Ir(ppy)2(dcbpy)}2(H2O)2]·8H2O (1-H2O), [Cd2{Ir(dfppy)2(dcbpy)}4]·DMF (2) and [Cd{Ir(bt)2(dcbpy)}2]·DMF (3) have been synthesised and their chemical sensing properties towards metal ions determined. Framework 1 shows selectivity for Fe3+ over other common metal cations with a detection limit of 32 μM and quantitation limit of 96 μM. Upon soaking in water 1 transforms into 1-H2O, changing the coordination geometry at Cd(II) and distorting the structure of the cation sensing site. Surprisingly, the structural distortion of 1-H2O results in improved selectivity for Fe3+, potentially due to the narrowing of pores inside the CP precluding the diffusion of large metal ions to the sensing site.
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