Morpholinium 2-chloro-4-nitrobenzoate, 2-chloro-5-nitrobenzoate and 4-chloro-3-nitrobenzoate.

Morpholinium 2-chloro-4-nitrobenzoate, C4H10NO+*C7H3ClNO4-, (I), crystallizes in a non-centrosymmetric space group. The cations and anions are connected by N-H...O hydrogen bonds to afford a 2(1) helical chain. Morpholinium 2-chloro-5-nitrobenzoate, C4H10NO+*C7H3ClNO4-, (II), and morpholinium 4-chloro-3-nitrobenzoate, C4H10NO+*C7H3ClNO4-, (III), both crystallize in a centrosymmetric space group. In (II) and (III), two cations and two anions are held together by N-H.O hydrogen bonds to form a centrosymmetric ring with graph-set descriptor R4(4)(12).