We report the synthesis, structural characterisation and detailed photophysical description of three cationic cyclometalated iridium(III) complexes (2–4) bearing a chelating diisocyanide as the ancillary ligand (1 ¼ 2,200-diisocyano-1,10:30,100-terphenyl). All compounds display irreversible reduction and oxidation potentials and emit from a triplet excited state centred on the cyclometalating ligands with lifetimes of several dozen microseconds, as commonly observed for other iridium(III) isocyanide complexes and further confirmed by DFT calculations. Room-temperature photoluminescence can be tuned from blue to orange upon variation of the cyclometalating ligands, and the related quantum yields range from around 30% in acetonitrile solution to nearly 80% in solid-state, as for complex 3 embedded in a 1% w/w poly(methyl methacrylate) matrix.
A chelating diisocyanide ligand for cyclometalated Ir(III) complexes with strong and tunable luminescence / Monti, Filippo; Baschieri, Andrea; Matteucci, Elia; Mazzanti, Andrea; Sambri, Letizia; Barbieri, Andrea; Armaroli, Nicola. - In: FARADAY DISCUSSIONS. - ISSN 1364-5498. - STAMPA. - 185:(2015), pp. 233-248. [10.1039/c5fd00064e]
A chelating diisocyanide ligand for cyclometalated Ir(III) complexes with strong and tunable luminescence
BASCHIERI, ANDREA;MATTEUCCI, ELIA;MAZZANTI, ANDREA;SAMBRI, LETIZIA;
2015
Abstract
We report the synthesis, structural characterisation and detailed photophysical description of three cationic cyclometalated iridium(III) complexes (2–4) bearing a chelating diisocyanide as the ancillary ligand (1 ¼ 2,200-diisocyano-1,10:30,100-terphenyl). All compounds display irreversible reduction and oxidation potentials and emit from a triplet excited state centred on the cyclometalating ligands with lifetimes of several dozen microseconds, as commonly observed for other iridium(III) isocyanide complexes and further confirmed by DFT calculations. Room-temperature photoluminescence can be tuned from blue to orange upon variation of the cyclometalating ligands, and the related quantum yields range from around 30% in acetonitrile solution to nearly 80% in solid-state, as for complex 3 embedded in a 1% w/w poly(methyl methacrylate) matrix.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.