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The title compound {systematic name: (+)-(S)-3-[5-cyano-2-(4-fluoro­phen­yl)-1,3-dihydro­isobenzofuran-2­yl]­propan­amin­ium oxalate oxalic acid 0.325-hydrate}, 2C20H22FN2O+·C2O42−·C2H2O4·0.325H2O, is a mol­ecular salt of the N-protonated escitalopram cation. As well as charge-balancing oxalate dianions, neutral mol­ecules of oxalic acid are present. The component species inter­act by way of N—H...O and short O—H...O hydrogen bonds, resulting in supra­molecular chains.

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In the structure of the title salt [systematic name: 3-(10,11-dihydro-5H-dibenzo[a,d][7]annulen-5-yl­idene)-N,N-dimethyl­propan-1-aminium 2,4,6-trinitro­phenolate] of a tricyclic anti­depressant, C20H24N+·C6H2N3O7, the dimethyl­amino­propyl subunit possesses a classical static conformational disorder. The central cyclo­hepta­diene ring adopts a bent conformation that is inter­mediate between boat and chair forms, leading to a butterfly shape for the hetero-tricyclic moiety. In a complementary fashion, donors from amitriptyline and acceptors from picrate form inter­molecular C—H...O hydrogen bonds and N—H...O salt bridges. These hydrogen bonds cluster amitriptyline and picrate ions into a closed R44(36) hetero-tetra­mer, whereas inter­molecular C—H...π inter­actions between amitriptyline ions cluster them into homo-dimers. Significant π–π stacking inter­actions are also observed between aromatic rings of amitriptyline and picrate, and these, combined with the C—H...π inter­actions, associate mol­ecules into linear arrays along the [1\overline{1}1] direction.
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