Redox control and high conductivity of nickel bis(dithiolene) complex π-nanosheet: A potential organic two-dimensional topological insulator

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

Research output: Contribution to journalArticlepeer-review

371 Citations (Scopus)

Abstract

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).

Original languageEnglish
Pages (from-to)14357-14360
Number of pages4
JournalJournal of the American Chemical Society
Volume136
Issue number41
DOIs
Publication statusPublished - 2014 Oct 15

Fingerprint

Dive into the research topics of 'Redox control and high conductivity of nickel bis(dithiolene) complex π-nanosheet: A potential organic two-dimensional topological insulator'. Together they form a unique fingerprint.

Cite this