Coordination polymers with iridium(<scp>iii</scp>) metalloligands: the effect of pore size upon luminescent cation sensing
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)<sub>2</sub>(dcbpy)}<sub>2</sub>] (1), [Cd{Ir(ppy)<sub>2</sub>(dcbpy)}<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·8H<sub>2</sub>O (1-H2O), [Cd<sub>2</sub>{Ir(dfppy)<sub>2</sub>(dcbpy)}<sub>4</sub>]·DMF (2) and [Cd{Ir(bt)<sub>2</sub>(dcbpy)}<sub>2</sub>]·DMF (3) have been synthesised and their chemical sensing properties towards metal ions determined. Framework 1 shows selectivity for Fe<sup>3+</sup> 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 Fe<sup>3+</sup>, potentially due to the narrowing of pores inside the CP precluding the diffusion of large metal ions to the sensing site.
Authors
- Carol Hua (ORCID: https://orcid.org/0000-0002-4207-9963)
- Christopher R. Hall (ORCID: https://orcid.org/0000-0003-1267-1277)
- Pattara Siripanich (ORCID: https://orcid.org/0009-0007-4607-3028)
- Timothy U. Connell (ORCID: https://orcid.org/0000-0002-6142-3854)
- Hong Zhang (ORCID: https://orcid.org/0000-0002-4294-1082)
- Oliver G. Stansfield
Institutions
- Deakin University (AU)
- The University of Melbourne (AU)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5dt00813a
- Citations
- 2
- Primary Topic
- Metal-Organic Frameworks: Synthesis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.07
Funders
- Australian Research Council
- Centre of Excellence in Exciton Science