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

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

A bulk material comprising stacked nanosheets of nickel bis(dithiolene) complexes is investigated. The average oxidation number is −3/4 for each complex unit in the as-prepared sample; oxidation or reduction respectively can change this to 0 or −1. Refined electrical conductivity measurement, involv...

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Veröffentlicht in:Journal of the American Chemical Society 2014-10, Vol.136 (41), p.14357-14360
Hauptverfasser: Kambe, Tetsuya, Sakamoto, Ryota, Kusamoto, Tetsuro, Pal, Tigmansu, Fukui, Naoya, Hoshiko, Ken, Shimojima, Takahiro, Wang, Zhengfei, Hirahara, Toru, Ishizaka, Kyoko, Hasegawa, Shuji, Liu, Feng, Nishihara, Hiroshi
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container_end_page 14360
container_issue 41
container_start_page 14357
container_title Journal of the American Chemical Society
container_volume 136
creator Kambe, Tetsuya
Sakamoto, Ryota
Kusamoto, Tetsuro
Pal, Tigmansu
Fukui, Naoya
Hoshiko, Ken
Shimojima, Takahiro
Wang, Zhengfei
Hirahara, Toru
Ishizaka, Kyoko
Hasegawa, Shuji
Liu, Feng
Nishihara, Hiroshi
description A bulk material comprising stacked nanosheets of nickel bis(dithiolene) complexes is investigated. The average oxidation number is −3/4 for each complex unit in the as-prepared sample; oxidation or reduction respectively can change this to 0 or −1. 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 × 102 S cm–1, 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).
doi_str_mv 10.1021/ja507619d
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title Redox Control and High Conductivity of Nickel Bis(dithiolene) Complex π‑Nanosheet: A Potential Organic Two-Dimensional Topological Insulator
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