Crystal and molecular structure of tetramethylammonium picrate

The synthesis and crystal and molecular structure of the tetramethylammonium picrate [C₄H₁₂N⁺C₆H₂N₃O₇] is reported. It belongs to the triclinic space groupP¯1 witha=7.300(3),b=9.797(2),c=10.841(3)Å,=64.70(2),=88.60(3), =79.55(2)° andZ=2. The structure was refined to a finalR value equal to 0.046 (R_w=0.053) for 1817 unique reflections. The crystal packing consists of parallel layers of anions interacting through electrostatic and short van der Waals contacts with neighboring cations. Vibrational spectra have been recorded and discussed.This work is part of the systematic research activity of A.M. during the first year of his Dottorato di Ricerca in Scienze Chimiche at the Chemistry Department, University of Modena.