Enlarging the 蟺 System of Phosphorescent (C^C*) Cyclometalated Platinum(II) NHC Complexes

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• 作者：Alexander Tronnier ; Alexander P枚thig ; Stefan Metz ; Gerhard Wagenblast ; Ingo M眉nster ; Thomas Strassner
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：June 16, 2014
• 年：2014
• 卷：53
• 期：12
• 页码：6346-6356
• 全文大小：439K
• 年卷期：v.53,no.12(June 16, 2014)
• ISSN：1520-510X

文摘

Cyclometalated (C^C*) platinum(II) N-heterocyclic carbene (NHC) complexes are emerging as a new class of phosphorescent emitters for the application in organic light-emitting devices (OLEDs). We present the synthesis of six new complexes of this class to investigate the influence of extended 蟺 systems. Therefore, six different NHC ligands with a varying number of additional phenyl substituents were used in combination with the monoanionic acetylacetonate (acac) ligand to obtain complexes of the general formula [(NHC)Pt(II)(acac)]. The complexes were fully characterized by standard techniques and advanced spectroscopic methods (¹⁹⁵Pt NMR). For all complexes the solid-state structure determination revealed a square-planar coordination of the platinum atom. Absorption and emission spectra were measured in thin amorphous poly(methyl methacrylate) films at room temperature. Four compounds emit in the blue-green region of the visible spectrum with quantum yields of up to 81%.