Synthesis, Crystal Structure, Electronic Absorption and Magnetic Properties of a Novel Anion-Radical Salt Based on 7,7,8,8-Tetracyanoquinodimethane

Liu, Guangxiang; Guo, Wei; Yang, Hao; Nishihara, Sadafumi; Ren, Xiao‐Ming

doi:10.1007/s10870-011-0085-8

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…These tetramers can stack, forming 1D (Ashwell et al, 1977c,d;Filhol et al, 1980;Filhol & Thomas, 1984;U ¨ngo ¨r et al, 2021b) or 2D arrays (Kubota et al, 2014). Stacks of equidistant radicals, which involve long-range antiferromagnetic ordering and semiconductive properties have also been described for a number of compounds (Shirotani & Kobayashi, 1973;Kistenmacher et al, 1974;Endres, 1982;Bryce et al, 1990;Visser et al, 1990f;Murata et al, 2007;Chen et al, 2008;Liu et al, 2011). Less common are stacked pentamers (Ashwell et al, 1977c(Ashwell et al, ,d, 1978Lu et al, 2011) and structures comprising two different types of stacks (Ashwell et al, 1978;Murata et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Semiconductive 2D arrays of pancake-bonded oligomers of partially charged TCNQ radicals

Molčanov¹,

Milašinović²,

Kojić‐Prodić³

et al. 2022

Int Union Crystallogr J

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Multicentre two-electron (mc/2e or `pancake bonding') bonding between 7,7,8,8-tetracyanoquinodimethane (TCNQ) radical anions was studied on its 14 novel salts with planar organic cations. The formal charges of the TCNQδ− 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 [10−2 (Ω cm)−1] correlates with short interplanar distances between pancake-bonded oligomers.

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