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. 2019 Jan 28;58(5):1371-1375.
doi: 10.1002/anie.201812132. Epub 2018 Dec 3.

On the Design of Radical-Radical Cocrystals

Mitchell A Nascimento  1 , Elodie Heyer  1 , Joshua J Clarke  1 , Hugh J Cowley  1 , Antonio Alberola  2 , Nadia Stephaniuk  1 , Jeremy M Rawson  1
Affiliations

On the Design of Radical-Radical Cocrystals

Mitchell A Nascimento et al. Angew Chem Int Ed Engl. .

Abstract

Formation of radical-radical cocrystals is an important step towards the design of organic ferrimagnets. We describe a simple approach to generate radical-radical cocrystals through the identification and implementation of well-defined supramolecular synthons which favor cocrystallization over phase separation. In the current paper we implement the structure-directing interactions of the E-E bond (E=S, Se) of dithiadiazolyl (DTDA) and diselenadiazolyl (DSDA) radicals to form close contacts to electronegative groups. This is exemplified through the preparation and structural characterization of three sets of radical cocrystals; the 2:2 cocrystal [PhCNSSN]2 [MBDTA]2 (4) [MBDTA=methyl benzodithiazolyl] and the 2:1 cocrystals [C6 F5 CNEEN]2 [TEMPO] (E=S, 5; E=Se, 6). In 4 the two types of radical are linked via bifurcated inter-dimer δ+ S⋅⋅⋅Nδ- interactions whereas 5 and 6 exhibit a set of five-centre δ+ E⋅⋅⋅Oδ- contacts (E=S, Se).

Keywords: TEMPO; co-crystals; diselenadiazolyl; dithiadiazolyl; organic ferrimagnets.

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