Neutral Luminescent Bis(bipyridyl) Osmium(II) Complexes with Improved Phosphorescent Properties

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• 作者：Wing-Kin Chu ; Shek-Man Yiu ; Chi-Chiu Ko
• 刊名：Organometallics
• 出版年：2014
• 出版时间：December 8, 2014
• 年：2014
• 卷：33
• 期：23
• 页码：6771-6777
• 全文大小：350K
• ISSN：1520-6041

文摘

A new class of neutral bis(isocyanoborato) bis(bipyridyl) Os(II) complexes with the general formula of [Os(N鈥揘)₂(CNBR₃)₂] (N鈥揘 = bpy, 4,4鈥?Me₂bpy; R = C₆F₅, C₆H₅) were prepared with simple synthetic methodologies. One of these complexes was structurally characterized by X-ray crystallography. Unlike most of the neutral bis(bipyridyl) Os(II) complexes, which are very weakly emissive or nonemissive, these isocyanoborato complexes displayed intense orange to red phosphorescence with a luminescent quantum yield up to 0.09 in CH₂Cl₂ solution at room temperature. The photophysical and electrochemical properties of these complexes were also investigated. Detailed photophysical study showed that these complexes exhibited significantly enhanced emission properties over other reported neutral bis(bipyridyl) Os(II) complexes. In addition, it also revealed that the photophysics, electrochemistry, and excited state properties can be fine-tuned or modified through the functionalization of isocyanoborate ligands.