Iridium(III) bis-terpyridine complexes incorporating pendent N-methylpyridinium groups: luminescent sensors for chloride ions †

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Abstract
Isomeric bis-terpyridine complexes of iridium(III) incorporating meta- or para-N-methylpyridyl substituents at the terpyridine 4′-position display long-lived luminescence in solution which is quenched by chloride ions to very different extents.