Controlling emission energy in metal–organic frameworks featuring cyclometalated iridium(III) linkers

Carol Hua; Timothy U. Connell

doi:10.1071/CH23127

RESEARCH ARTICLE (Open Access)

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Controlling emission energy in metal–organic frameworks featuring cyclometalated iridium(III) linkers

Carol Hua

^A ^* and Timothy U. Connell

^B ^*

+ Author Affiliations

- Author Affiliations

^A School of Chemistry, The University of Melbourne, Parkville, Vic. 3010, Australia.

^B School of Life and Environmental Sciences, Deakin University, Waurn Ponds, Vic. 3216, Australia.

^* Correspondence to: carol.hua@unimelb.edu.au, t.connell@deakin.edu.au

Handling Editor: Curt Wentrup

Australian Journal of Chemistry 76(10) 686-695 https://doi.org/10.1071/CH23127
Submitted: 30 June 2023 Accepted: 16 August 2023 Published: 20 September 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Efficient solid-state luminescent materials are critical components in varied optoelectronic devices. Here, we report three metal–organic frameworks combining calcium(II) with heteroleptic iridium(III) metalloligands containing the same 1,2-diimine ancillary ligand but different cyclometalating ligands. The synthesised frameworks exhibit similar supramolecular structure but different emission properties depending on the cyclometalating ligand. Binding calcium(II) to the metalloligands further affects framework emission depending on the relative contribution of triplet charge transfer (³MLLCT) or ligand-centred (³LC) transitions to the emissive excited state.

Keywords: calcium, coordination chemistry: structure, iridium, luminescence, metal–organic framework, photochemistry, solid state, transition metals.

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