Bilayer mott system with cation···anion supramolecular interactions based on a nickel dithiolene anion radical: coexistence of ferro- and antiferromagnetic anion layers and large negative magnetoresistance

Tetsuro Kusamoto; Hiroshi M Yamamoto; Naoya Tajima; Yugo Oshima; Satoshi Yamashita; Reizo Kato

doi:10.1021/ic400285a

Bilayer mott system with cation···anion supramolecular interactions based on a nickel dithiolene anion radical: coexistence of ferro- and antiferromagnetic anion layers and large negative magnetoresistance

Inorg Chem. 2013 May 6;52(9):4759-61. doi: 10.1021/ic400285a. Epub 2013 Apr 5.

Authors

Tetsuro Kusamoto¹, Hiroshi M Yamamoto, Naoya Tajima, Yugo Oshima, Satoshi Yamashita, Reizo Kato

Affiliation

¹ RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan. kusamoto@chem.s.u-tokyo.ac.jp

PMID: 23560680
DOI: 10.1021/ic400285a

Abstract

A novel bilayer Mott system, (Et-4BrT)[Ni(dmit)2]2 (Et-4BrT = ethyl-4-bromothiazolium; dmit = 1,3-dithiole-2-thione-4,5-dithiolate), contains two nonequivalent Ni(dmit)2 anion layers, where both layers form Mott insulating states. Supramolecular Br(cation)···S(anion) and S(cation)···S(anion) interactions play a crucial role in constructing the bilayer structure. The ferro- and antiferromagnetic short-range-ordering layers coexist in the crystal, which achieves large negative magnetoresistance (Δρ/ρ0 ≈ -75% at 70 kOe) at 5 K under 1 GPa.