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The asymmetric unit of the title salt [systematic name: bis­(4-(2,3-dichloro­phen­yl)-1-{4-[(2-oxo-1,2,3,4-tetra­hydro­quinolin-7-yl)­oxy]but­yl}piperazin-1-ium) oxalate-oxalic acid (1/1)], 2C23H28Cl2N3O2+·C2O42-·C2H2O4, consists of one protonated aripiprazole unit (HArip+), half an oxalate dianion and half an oxalic acid mol­ecule, the latter two lying on inversion centres. The conformation of the HArip+ cation differs from that in other reported salts and resembles more the conformation of neutral Arip units in reported polymorphs and solvates. The inter­molecular inter­action linking HArip+ cations is also similar to those in reported Arip compounds crystallizing in the space group P\overline{1}, with head-to-head N-H...O hydrogen bonds generating centrosymmetric dimers, which are further organized into planar ribbons parallel to (01\overline{2}). The oxalate anions and oxalic acid mol­ecules form hydrogen-bonded chains running along [010], which `pierce' the planar ribbons, inter­acting with them through a number of stronger N-H...O and weaker C-H...O hydrogen bonds, forming a three-dimensional network.
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