Semiconductive 2D Arrays of Pancake-bonded Oligomers of Partially Charged TCNQ Radicals

Overview

Journal IUCrJ

Date 2022 Jul 18

PMID 35844480

Authors

Kresimir Molcanov

Valentina Milasinovic

Biserka Kojic-Prodic

Nadica Maltar-Strmecki

Jiangyang You

Ana Santic

Lidija Kanizaj

Vladimir Stilinovic

Luka Fotovic

Affiliations

Soon will be listed here.

Abstract

Multicentre two-electron (mc/2e or 'pancake bonding') bonding between 7,7,8,8-tetra-cyano-quinodi-methane (TCNQ) radical anions was studied on its 14 novel salts with planar organic cations. The formal charges of the TCNQ moieties are -1/2 and -2/3, and they form mc/2e bonded dimers, trimers and tetramers which are further stacked into extended arrays. Multicentre bonding within these oligomers is characterized by short interplanar separations of 2.9-3.2 Å; distances between the oligomers are larger, typically >3.3 Å. The stacks are laterally connected by C-H⋯N hydrogen bonding, forming 2D arrays. The nature of mc/2e bonding is characterized by structural, magnetic and electrical data. The compounds are found to be semiconductors, and high conductivity [10 (Ω cm)] correlates with short interplanar distances between pancake-bonded oligomers.

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