The crystal structures of three clozapinium salts : different molecular configurations, and supramolecular assembly in one, two and three dimensions
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The structures of three salts derived from clozapine, 8-chloro-11-(4-methylpiperazin-1-yl)-5H-dibenzo[b,e][1,4]diazepine, are reported, namely, clozapinium 3,5-dinitrobenzoate dimethyl sulfoxide monosolvate, C18H20ClN4+·C7H3N2O6-·C2H6OS, (I), where the dimethyl sulfoxide component is disordered over two sets of atomic sites having occupancies 0.627 (2) and 0.373 (2); clozapinium hydrogen maleate 0.21-hydrate, C18H20ClN4+·C4H3O4-·0.21H2O, (II), and clozapinium 2-hydroxybenzoate, C18H20ClN4+·C7H5O3-, (III). In all three salts, the protonation site is the methylated N atom of the piperazine ring, and the dimensions and conformations of the fused tricyclic system are very similar. However, differences are apparent in the piperazine component: in both compounds (II) and (III), the unprotonated N atom of this ring has a pyramidal geometry, but in compound (I) this atom has a planar geometry. In compound (III), both N-substituents in this ring occupy equatorial sites, but in compound (II) the fused tricyclic system occupies an axial site of the piperazine ring. The independent components of compound (I) are linked within the selected asymmetric unit by a combination of N-HO and C-HO hydrogen bonds, and these hydrogen-bonded aggregates are linked into chains by an aromatic - stacking interaction. In compound (II), the components are linked into sheets by a combination of O-HO, N-HO and C-HO hydrogen bonds, and in compound (III), a combination of N-HO, C-HO and C-HN hydrogen bonds links the components into a three-dimensional framework structure. Comparisons are made with some similar compounds.
Kaur , M , Jasinski , J P , Yathirajan , H S , Kavitha , C N , Glidewell , C & Harrison , W T A 2015 , ' The crystal structures of three clozapinium salts : different molecular configurations, and supramolecular assembly in one, two and three dimensions ' Acta Crystallographica. Section E, Structure reports online , vol 71 , no. 4 , pp. 406-413 . DOI: 10.1107/S205698901500554X
Acta Crystallographica. Section E, Structure reports online
Copyright 2015 the Authors. This article is covered by the Creative Commons Attribution license (http://creativecommons.org/licenses/by/2.0/uk/legalcode)
MK thanks the UOM for research facilities and is also grateful to CPEPA, UGC, for the award of a JRF. JPJ acknowledges the NSF–MRI program (grant No. 1039027) for funds to purchase the X-ray diffractometer.
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