title: Phosphorescent Platinum(II) Complexes with C^C* Cyclometalated NHC Dibenzofuranyl Ligands: Impact of Different Binding Modes on the Decay Time of the Excited State.
abstract: Two C^C* cyclometalated platinum(II) N-heterocyclic carbene (NHC) complexes with the general formula [(C^C*)Pt(O^O)] (C^C*=1-dibenzofuranyl-3-methylbenzimidazolylidene; O^O=dimesitoylmethane) have been synthesized and extensively characterized, including solid-state structure determination, (195) Pt NMR spectroscopy, and 2D NMR (COSY, HSQC, HMBC, NOESY) spectroscopy to elucidate the impact of their structural differences. The two regioisomers differ in the way the dibenzofuranyl (DBF) moiety of the NHC ligand is bound to the metal center, which induces significant changes in their physicochemical properties, especially on the decay time of the excited state. Quantum yields of over 80 % and blue emission colors were measured.
authors.affiliation: Physikalische Organische Chemie, Technische Universität Dresden, 01069 Dresden (Germany).
authors.forename: Alexander
authors.initials: A
authors.lastname: Tronnier
authors.affiliation: BASF SE, 67056 Ludwigshafen (Germany).
authors.forename: Gerhard
authors.initials: G
authors.lastname: Wagenblast
authors.affiliation: BASF SE, 67056 Ludwigshafen (Germany).
authors.forename: Ingo
authors.initials: I
authors.lastname: Münster
authors.affiliation: Physikalische Organische Chemie, Technische Universität Dresden, 01069 Dresden (Germany). thomas.strassner@chemie.tu-dresden.de.
authors.forename: Thomas
authors.initials: T
authors.lastname: Strassner
keywords: X-ray diffraction; carbene complexes; density functional calculations; ligand design; photophysics