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Phosphorescent Platinum(II) Complexes with C^C* Cyclometalated NHC Dibenzofuranyl Ligands: Impact of Different Binding Modes on the Decay Time of the Excited State
Author(s) -
Tronnier Alexander,
Wagenblast Gerhard,
Münster Ingo,
Strassner Thomas
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201502087
Subject(s) - moiety , platinum , phosphorescence , excited state , chemistry , carbene , ligand (biochemistry) , nuclear magnetic resonance spectroscopy , stereochemistry , structural isomer , spectroscopy , metal , two dimensional nuclear magnetic resonance spectroscopy , heteronuclear single quantum coherence spectroscopy , crystallography , photochemistry , catalysis , organic chemistry , fluorescence , physics , biochemistry , receptor , quantum mechanics , nuclear physics
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.