Fine Tuning of π-Stack Separation Distances of Semiquinone Radicals Affects Their Magnetic and Electric Properties

• DOI: 10.1021/acs.cgd.6b00675
• Publication Date: 2016-08-19T11:22:59Z
• Authors: Krešimir Molčanov; Vladimir Stilinović; Ana Šantić; Nadica Maltar-Str...; Damir Pajić; Biserka Kojić-Prodić
• Keywords: Diamagnetism; Semiquinone

Two salts of tetrachloro- (chloranil, Cl4Q) and tetrabromosemiquinone (bromanil, Br4Q) radical anions with an organic cation N-methylpyridinium (N-MePy), displaying a variety tunable electrical magnetic properties, are characterized. These systems comprise π-stacks equidistant semiquinone anions, without Peierls deformation diamagnetic spin coupling. Both stable up to 150 120 °C in air, respectively, semiconductors conductivities 10–6–10–7 (Ω cm)−1 the single crystals. The room-temperature concomitant crystallization two polymorphs different properties (antiferromagnetic Peierls-distorted diamagnetic) has been observed for Cl4Q·N-MePy. represent novel class potential (multi)functional materials properties.