Dithiadiazolyl magnetism

Dithiadiazolyl radicals are considered to be organic molecular magnets and conductors and therefore chemists display increasing interest. Treatment of... 

When R = Bu or a polyfluorinated aryl group (4-XCgF4, X = Br, CN, NO2), the 1,2,3,5-dithiadiazolyl radicals [RCN2S2] exist as monomers, whose magnetic properties are of particular interest. The tert-butyl derivative 5.5 is an unusual example of a liquid that is paramagnetic at room temperature the... 

Dithiadiazolyl radicals are of interest in the design of molecular conductors. Multifunctional radicals, for example, 1,3,5-C6H3 (CN2 82)3, have been prepared.Iodine doping increases the conductivity of these radical systems. Materials with unique magnetic properties are produced by introducing substituents that inhibit the dimerization process. ... 

Owing to the thermal and photochemical sensitivity of the radicals (Section XXI.A) and, in some cases, the possibility of polymerization at high concentration (Section XXI.B), the data on pure samples are limited. The only magnetic data currently available for 1,3,2,4-dithiadiazolyl radicals are for 3 (R = rBu) at room temperature this compound is a brown liquid, with an effective magnetic moment of 1.5 p,B (87CC69), somewhat less than the anticipated value for a single unpaired electron of 1.73 fiB. Nevertheless, this material can be described as a paramagnetic liquid as it is virtually dissociated in the liquid state (see also Section IX.D). 

Magnetic exchange interactions in perfluorophenyl 1,2,3,5-dithiadiazolyl radicals 05CCR(249)2631. 

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