Redox Control and High Conductivity of Nickel Bis(dithiolene) Complex 蟺-Nanosheet: A Potential Organic Two-Dimensional Topological Insulator

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• 作者：Tetsuya Kambe ; Ryota Sakamoto ; Tetsuro Kusamoto ; Tigmansu Pal ; Naoya Fukui ; Ken Hoshiko ; Takahiro Shimojima ; Zhengfei Wang ; Toru Hirahara ; Kyoko Ishizaka ; Shuji Hasegawa ; Feng Liu ; Hiroshi Nishihara
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：October 15, 2014
• 年：2014
• 卷：136
• 期：41
• 页码：14357-14360
• 全文大小：289K
• ISSN：1520-5126

文摘

A bulk material comprising stacked nanosheets of nickel bis(dithiolene) complexes is investigated. The average oxidation number is 鈭?/4 for each complex unit in the as-prepared sample; oxidation or reduction respectively can change this to 0 or 鈭?. Refined electrical conductivity measurement, involving a single microflake sample being subjected to the van der Pauw method under scanning electron microscopy control, reveals a conductivity of 1.6 脳 10² S cm^鈥?, which is remarkably high for a coordination polymeric material. Conductivity is also noted to modulate with the change of oxidation state. Theoretical calculation and photoelectron emission spectroscopy reveal the stacked nanosheets to have a metallic nature. This work provides a foothold for the development of the first organic-based two-dimensional topological insulator, which will require the precise control of the oxidation state in the single-layer nickel bisdithiolene complex nanosheet (cf. Liu, F. et al. Nano Lett. 2013, 13, 2842).