JOSE IGNACIO SOTO/FOTOLIA
The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the Highers/Advanced Highers exam specifications.
Iridium is a transition metal that gives rise to coloured species due to the electron configuration of the metal. Phosphorescent complexes of iridium (and other related metals) with organic ligands can be used as sensors for pH changes and oxidation state.
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