1,1-Diamino-2,2-dintroethene (FOX-7) in Copper and Nickel Diamine Complexes and Copper FOX-7

1,1-Diamino-2,2-dinitroethene (FOX-7) reacts readily with copper nitrate in an aqueous solution of potassium hydroxide to form pea green Cu(FOX)(2)(H2O)(2) (5). FOX-7 complexes of copper and nickel supported by a variety of diamines including Cu(ea)(2)(FOX)(2)(H2O) (1), Cu(pn)(2)(FOX)(2) (2), Cu(bipy)(FOX)(2)(H2O)(4) (3a), Cu(bipy)(2)(FOX)(2)(H2O)(2.5) (3b), Cu(bipy)(FOX)(2)(DMSO)(2)center dot 2DMSO (3c), Cu(phen)(3)(FOX)(2)(H2O)(3) (4), (Ni)(2)(pben)(6)(FOX)(4)(NO3)(3)(H2O)(2) (6), and Ni(bipy)(3)(FOX)(2)(H2O)(4) (7a) were obtained via metathesis reactions with potassium-FOX (K-FOX). Surprisingly FOX-7, in the presence of Ni(II) and bipyridyl in a mixed solvent of methanol and dimethyl sulfoxide, gave a chelated FOX carbamate anion resulting in the compound Ni(bipy)2(FOX-CO2)center dot(DMSO) (7b). All metal salts were characterized by infrared, elemental analysis, and differential scanning calorimetry (DSC). Single-crystal X-ray diffraction structures were obtained for compounds 1, 2, 3c, 6, and 7b.