Dual visible/NIR emission from organometallic iridium(III) complexes

Content Provider	Semantic Scholar
Author	Phillips, Kaitlin A. Stonelake, Thomas M. Horton, Peter N. Coles, Simon J. Hallett, Andrew Jon O'Kell, Sean P. Beames, Joseph M. Pope, Simon J. A.
Copyright Year	2019
Abstract	A series of four substituted benzo[g]quinoxaline species have been synthesised and utilised as cyclometalating ligands for iridium(III). The ligands (L1-L4) were synthesised and isolated in good yield following the condensation of 2,3-diaminonaphthalene with benzil and three of its derivatives. The substituent modulated electronic properties of L1-L4 were dominated by intraligand π−π* transitions, with the fluorescence profile demonstrating vibronic features attributed to the highly conjugated nature of the chromophore. Iridium(III) complexes of the form [Ir(L)2 (bipy)]PF6 were synthesised from L1-L4 in two steps. The electronic properties of the complexes reveal absorption in the UV-vis. region with spin forbidden metal-to-ligand charge transfer (MLCT) transitions possibly contributing at longer wavelengths to ca. 600 nm. Steady state luminescence (aerated, room temperature) on solutions of the complexes showed dual emissive properties in the visible and near-infra red (NIR) regions. Firstly, a vibronically structured emission in the visible region (ca. 525 nm) was attributed to ligand centred fluorescence (lifetime
Starting Page	11
Ending Page	20
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1016/j.jorganchem.2019.04.019
Alternate Webpage(s)	http://orca-mwe.cf.ac.uk/122478/8/1-s2.0-S0022328X19301597-main%20FINAL.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.jorganchem.2019.04.019
Volume Number	893
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article