Crystal structures of N,N-dimethyl-(2-(2,2-diphenyl)-2-prop-2-ynyloxy)acetoxy)ethylamine and N,N-dimethyl-(2-(2,2-diphenyl)-2-prop-2-ynyloxy) acetoxy)ethylammonium 2,4,6-trinitrophenolate.

The N,N-dimethylethylamminium unit in N,N-dimethyl-[2-(2,2-diphenyl)-2- prop-2-ynyloxyacetoxy]ethylamine, C₂₁H₂₃NO₃ (I), is disordered over two sets of atomic sites having occupancies of 0.880 (3) and 0. 120 (3), but there are no direction-specific interactions between the molecules of (I). The cation in N,Ndimethyl-[ 2-(2,2-diphenyl)-2-prop-2-ynyloxyacetoxy]ethylammonium 2,4,6-trinitrophenolate (picrate), C₂₁H₂₄NO₃⁺⋅C₆H₂N₃O₇^- (II), shows a similar type of disorder, with occupancies of 0.654 (11) and 0.346 (11), although the overall conformation of the cation in (II) is different from that in the neutral (I). The component ions are are linked by an almost planar three-centre N--H ⋯ (O)₂ hydrogen bond, and the ion pairs are further linked by a combination of three C--H ⋯ O hydrogen bonds to form sheets. Comparisons are made with some related structures. [ABSTRACT FROM AUTHOR]