Synthesis of biscyclometalated iridium(III) acetylacetonate complexes via a 15 min bridge-splitting reaction, their characterisations and photophysical properties

Aydemir, MuratDos Santos, Paloma L.Monkman, Andrew P.2023-02-092023-02-092017-09-19Altınölçek, N. vd. (2017). ''Synthesis of biscyclometalated iridium(III) acetylacetonate complexes via a 15 min bridge-splitting reaction, their characterisations and photophysical properties''. Journal of Organometallic Chemistry, 851, 184-188.0022-328Xhttps://doi.org/10.1016/j.jorganchem.2017.09.0281872-8561https://www.sciencedirect.com/science/article/pii/S0022328X1730548Xhttp://hdl.handle.net/11452/30927Chloro-bridged diiridium(III) complexes (4a and 4b) were subjected to a bridge-splitting reaction with acetylacetone and sodium carbonate in 2-ethoxyethanol. The reaction was complete within 15 min and two novel biscyclometalated iridium(III) acetylacetonate complexes (5a and 5b) were successfully obtained in 41% and 63%, respectively. Complexes (5a and 5b) were fully characterised by H-1, C-13 NMR, FT-IR and elemental analysis. UV-Vis spectra of complexes (5a and 5b) showed two absorption bands: a strong one appears below 400 nm due to ligand-centered (LC, pi-pi*) transitions and the weak one arises between 400 and 600 nm due to metal-to-ligand charge-transfer (MLCT, d-pi*) transitions. The emission of the complexes (5a and 5b) arises in the red region of the spectrum, emitting ca. 675 nm for 5a and ca. 625 nm for 5b. A short emission lifetime (62 ns) for complex 5a indicates emission originates from (LC)-L-3 transitions. However longer emission lifetime (657 ns) for complex 5b confirms that the emission totally results from (MLCT)-M-3 transitions.eninfo:eu-repo/semantics/closedAccessChemistryBridge-splittingBiscyclometalated iridium(III) complexes2-PhenylpyridineFormyl groupLight-emitting-diodesphosPhorescent ir(III) complexesElectrochemical properties2-phenylpyridine ligandsState propertiesEmission colorRedBlueDevicesElectroluminescenceAcetoneCharge transferComplexationIridiumLigandsSynthesis (chemical)Acetylacetonate complexesEmission lifetimeFormyl groupIridium complexMetal to ligand charge transfersPhotophysical propertiesSplitting reactionsIridium compoundsSynthesis of biscyclometalated iridium(III) acetylacetonate complexes via a 15 min bridge-splitting reaction, their characterisations and photophysical propertiesArticle0004141720000212-s2.0-85030085538184188851Chemistry, inorganic & nuclearChemistry, organicLigands; Organic Light-emitting Diodes; 2-Phenylpyridine