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- W2002869846 abstract "The utility of Suzuki cross-coupling methodology for the in situ elaboration of bromo-functionalised bis-terpyridyl iridium(III) complexes has been explored. The complex [Ir(tpy)(tpy-ϕ-Br)]3+ {tpy-ϕ-Br = 4′-(4-bromophenyl)-2,2′:6′,2″-terpyridine} undergoes palladium-catalysed cross-coupling with aryl boronic acids to yield biaryl-substituted complexes directly. The biphenyl and 4-cyanobiphenyl-substituted products display relatively intense, long-lived (τ > 100 µs) yellow emission in degassed aqueous solution at room temperature, assigned to a 3π–π* state. A 4-aminobiphenyl-substituted analogue displays an additional low energy absorbance band, attributed to an intraligand charge-transfer (ILCT) excited state, and is scarcely emissive under the same conditions. The iridium(III) complex of 4′-mesityl-terpyridine is also reported. Its emission is much shorter-lived, with a spectral profile resembling that of unsubstituted [Ir(tpy)2]3+, confirming the need for the attainment of a roughly coplanar geometry for stabilisation of the 3π–π* excited state." @default.
- W2002869846 created "2016-06-24" @default.
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- W2002869846 date "2004-01-01" @default.
- W2002869846 modified "2023-09-25" @default.
- W2002869846 title "Cross-couplings in the elaboration of luminescent bis-terpyridyl iridium complexes: the effect of extended or inhibited conjugation on emission" @default.
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- W2002869846 doi "https://doi.org/10.1039/b313638h" @default.
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