Spirobifluorene bridged Ir(III) and Os(II) polypyridyl arrays: synthesis, photophysical characterization, and energy transfer dynamics

Inorganic Chemistry
Barbara VenturaRaymond Ziessel

Abstract

The synthesis, characterization, photophysics, and time-dependent density functional theory (TD-DFT) calculations of spirobifluorene-bipyridine based iridium(III), osmium(II), and mixed Ir/Os complexes are presented. The preparation of the reference and mixed complexes proceeded step-by-step and microwave irradiation facilitated the complexation of osmium. The absorption of the target heterobimetallic derivative, Ir-L-Os, is described by linear combination of half of the absorption spectra of the homobimetallic analogues, Ir-L-Ir and Os-L-Os, due to the occurrence of mixed ligand and metal based transitions when the spirobifluorene-(bpy)(2) bridging ligand L is linked to the metal, confirming a negligible interaction between the substituted metallic chromophores. TD-DFT calculations on monometallic, homo- and hetero-bimetallic complexes fully disentangled the origin of the absorption features. Noticeably, in the mixed Ir-L-Os complex an almost quantitative energy transfer from the (3)Ir to the (3)Os MLCT state is occurring, with a rate constant of 4.1 × 10(8) s(-1) and nearly exclusively via a Dexter-type mechanism mediated by the orbitals of the spiroconjugated ligand. This result, together with the outcomes of the TD-DFT calc...Continue Reading

References

Jan 4, 2003·Chemical Communications : Chem Comm·Jason M SerinJean M J Fréchet
Aug 12, 2005·Chemical Reviews·Jacopo TomasiRoberto Cammi
Mar 27, 2007·Chemical Reviews·Tobat P I SaragiJosef Salbeck
Apr 16, 2009·Journal of the American Chemical Society·Stéphane DiringRaymond Ziessel
May 2, 2009·The Journal of Chemical Physics·Detlev FiggenHermann Stoll
Jun 23, 2009·Journal of the American Chemical Society·Tissa SajotoMark E Thompson
Dec 8, 2009·Organic Letters·Daniel HerediaKen-Tsung Wong
Dec 17, 2009·Organic Letters·Toshiyuki KowadaKouichi Ohe
Jan 1, 2005·Topics in Current Chemistry·C ChiorboliF Scandola

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Citations

Jul 23, 2013·Inorganic Chemistry·Thomas BuraRaymond Ziessel
Nov 2, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Diego Rota MartirEli Zysman-Colman
Feb 23, 2018·Angewandte Chemie·Hauke C SchmidtOliver S Wenger
Oct 3, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Maria Pia GulloRaymond Ziessel
Mar 12, 2015·Inorganic Chemistry·Stefan ScheererRainer F Winter

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