Cross-couplings in the elaboration of luminescent bis-terpyridyl iridium complexes: the effect of extended or inhibited conjugation on emission

Dalton Transactions : an International Journal of Inorganic Chemistry
Wendy LeslieJ A Gareth Williams

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-phi-Br)]3+ [tpy-phi-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 (tau > 100 mus) yellow emission in degassed aqueous solution at room temperature, assigned to a 3pi-pi* 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 3pi-pi* excited state.

Citations

May 7, 2010·Chemical Communications : Chem Comm·Jeremy BrandelTatsuya Nabeshima
Jul 29, 2004·Chemical Society Reviews·Harald Hofmeier, Ulrich S Schubert
Mar 23, 2017·Topics in Current Chemistry·Abd Rashid Bin Mohd YusoffMohammad Khaja Nazeeruddin
Apr 4, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Cristiana SabatiniJ A Gareth Williams
Mar 18, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Ruth E DanielsValery N Kozhevnikov
Apr 13, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Yun MaWai-Yeung Wong
Nov 7, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Biswa Nath GhoshKari Rissanen
Apr 10, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·J A Gareth WilliamsVictoria L Whittle
May 15, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Victoria L Whittle, J A Gareth Williams
Aug 10, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Na ZhaoZhong-Ning Chen
Oct 14, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Louise S NatrajanSteven W Magennis
Nov 8, 2005·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Steve WelterLuisa De Cola
May 5, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Kathryn J Arm, J A Gareth Williams
Mar 21, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Louise M GuardNilay Hazari
Sep 17, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Jiajia YangJonathon E Beves
Jan 11, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Daniel C GoldsteinPall Thordarson
Jul 9, 2021·Chemistry : a European Journal·Marie PengJean-François Soulé
Oct 13, 2006·Inorganic Chemistry·Andrew J WilkinsonJ A Gareth Williams

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