Figure 6.

(a) Dependence of the O⋯H⋯O angle ANG3 on (q1 + q2); (b) dependence of ANG4 on (q1 + q2); (c) dependence of ANG5 on (q1 + q2). Colour code for symbols: green triangles refer to the structures with 2-hy­droxy-3,5-di­nitro­benzoic acid (I), black squares are the structures with 2-hy­droxy-3,5-di­nitro­benzoate (II), and red circles are the structures with 2-carb­oxy-4,6-di­nitro­phenolate (III); blue triangles, squares and circles are the recalculated structures with 2-hy­droxy-3,5-di­nitro­benzoic acid (I), 2-hy­droxy-3,5-di­nitro­benzoate (II) and 2-carb­oxy-4,6-di­nitro­phenolate (III), respectively.