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A heterotrimetallic Ir(III), Au(III) and Pt(II) complex incorporating cyclometallating bi- and tridentate ligands : simultaneous emission from different luminescent metal centres leads to broad-band light emission

Muñoz-Rodríguez, R.; Buñuel, E.; Fuentes, N.; Williams, J.A.G.; Cárdenas, D.J.

A heterotrimetallic Ir(III), Au(III) and Pt(II) complex incorporating cyclometallating bi- and tridentate ligands : simultaneous emission from different luminescent metal centres leads to broad-band light emission Thumbnail


Authors

R. Muñoz-Rodríguez

E. Buñuel

N. Fuentes

D.J. Cárdenas



Abstract

Di- and tri-nuclear metal complexes incorporating gold(III), iridium(III) and platinum(II) units linked via a 1,3,5-triethynylbenzene core are reported, together with the corresponding mononuclear complexes as models. The gold(III) and platinum(II) units comprise tridentate, cyclometallating, C^N^C and N^N^C-coordinating ligands, respectively, with the Ar–C[triple bond, length as m-dash]C– directly bound to the metal at the fourth coordination site. The iridium moiety is an Ir(ppy)2(acac) unit bound to the triethynylbenzene through a phenyl substituent at the 3-position of the acac ligand. The multinuclear compounds are prepared, using a modular synthetic strategy, from the monometallic complexes. All of the compounds are luminescent in solution at room temperature, and their photophysical properties were studied. The triplet excited state energies of the mononuclear complexes lie in the order Au > Ir > Pt. Consistent with this order, energy transfer from Au to Ir and from Au to Pt is observed, leading to quenching of the Au emission in the gold-containing multinuclear complexes. Energy transfer from Ir to Pt occurs at a rate that only partially quenches the Ir-based emission. As a result, the dinuclear Ir–Pt and trinuclear Au–Ir–Pt complexes display broad emission across most of the visible region of the spectrum.

Citation

Muñoz-Rodríguez, R., Buñuel, E., Fuentes, N., Williams, J., & Cárdenas, D. (2015). A heterotrimetallic Ir(III), Au(III) and Pt(II) complex incorporating cyclometallating bi- and tridentate ligands : simultaneous emission from different luminescent metal centres leads to broad-band light emission. Dalton Transactions, 44(18), 8394-8405. https://doi.org/10.1039/c4dt02761b

Journal Article Type Article
Acceptance Date Sep 25, 2014
Online Publication Date Sep 25, 2014
Publication Date May 14, 2015
Deposit Date Nov 14, 2014
Publicly Available Date Mar 28, 2024
Journal Dalton Transactions
Print ISSN 1477-9226
Electronic ISSN 1477-9234
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 44
Issue 18
Pages 8394-8405
DOI https://doi.org/10.1039/c4dt02761b