C. Focesfoces et al., THE CRYSTAL-STRUCTURE OF 3,5-DIMETHYL-4-NITROPYRAZOLE AND ITS NONLINEAR-OPTICAL PROPERTIES, Gazzetta chimica italiana, 123(9), 1993, pp. 477-479
The crystal structure of 3.5-dimethyl-4-nitropyrazole, C5H7N3O2, has b
een determined: trigonal, space group 3(1)21,a=b=12.2253(7),c=4.0833(2
)angstrom,Dc=1.330 g cm-3, Z = 3. The molecule crystallizes in a helix
which curls around the 3(1) axis.