Ancillary diamines in organometallic iridium(III) complexes: reactivity, structures and deep red phosphorescence
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Updated: Oct 30, 2026

ARL Spectral Fitting as an Application to Augment Spectral Data via Franck-Condon Lineshape Analysis and Color Analysis
Published on: August 19, 2021
Nadia T Alqurashi1, Peter N Horton2, Simon J Coles2
1Department of Chemistry, School of Physical, Chemical and Environmental Sciences, Cardiff University, Cardiff CF10 3AT, UK. popesj@cardiff.ac.uk.
Abstract:
Heteroleptic Ir(III)-based complexes of the form [Ir(C^N)2(N^N)]PF6 (where C^N = 2,6,7-trimethyl-3-phenylquinoxaline; N^N = diamine) were synthesised. The series encompasses chiral diamine derivatives. An array of spectroscopic and analytical techniques were used to fully characterise the complexes. Solid-state structures of three complexes, with ethylenediamine, cis-diaminocyclohexane and trans-diaminocyclohexane, were determined using single crystal X-ray diffraction. All structures confirmed the expected complex formulations and share comparable details regarding the parameters that define the coordination spheres. The complexes are redox active, display efficient broadband visible light absorption (λabs = 466-490 nm; ε > 2 × 103 M-1 cm-1) and are deep red emitters (λem = 645-660 nm; τ = 157-236 ns) consistent with dominant 3MLCT/3LLCT character. The use of chirally resolved diamine ligands imparts measureable circular dichroism signals.
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