Binuclear C^C Cyclometalated Platinum(II) NHC Complexes with Bridging Amidinate Ligands

• Published in: Angewandte Chemie (International ed.) Vol. 55; no. 51; pp. 15779 - 15782
• Main Authors: Leopold, Hendrik, Tenne, Mario, Tronnier, Alexander, Metz, Stefan, Münster, Ingo, Wagenblast, Gerhard, Strassner, Thomas
• Format: Journal Article
• Language: English
• Published: Germany Blackwell Publishing Ltd 19.12.2016; Wiley Subscription Services, Inc
• Edition: International ed. in English
• Subjects: amidinates; Ligands; luminescence; N-heterocyclic carbenes; OLEDs; platinum; platinum; luminescence; OLEDs; amidinates; N-heterocyclic carbenes
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201607075

Binuclear C^C* cyclometalated NHC platinum(II) compounds with bridging amidinate ligands were synthesized to evaluate their photophysical properties. Their three‐dimensional structures were determined by a combination of 2D NMR experiments, mass spectrometry, DFT calculations, and solid‐state structure analysis. The bridging amidinate ligands enforce short distances between the platinum centers of the two cyclometalated structures, which gives rise to extraordinary photophysical properties. Two phosphorescent binuclear C^C* cyclometalated PtII complexes bridged by N,N‐diphenylformamidinate ligands were synthesized and characterized by 2D NMR experiments, mass spectrometry, DFT calculations, and solid‐state structure analysis. The bridging amidinate ligands bring the two platinum centers into close proximity, which leads to extraordinary photophysical properties.