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The crystal structures of 3-[4-(chlorophenyl)methyl]-2-(1-pyrrolidiniomethyl)-1H-benzimidazolium tetrachlorocopper(II), (C19H22ClN3)[CuCl4], and 3-[4-(chlorophenyl)methyl]-2-(1-pyrrolidiniomethyl)-1H-benzimidazolium tetrachlorocobalt(II), (C19H22ClN3)[CoCl4], show different conformations of the free radical dihydro cations of clemizole, a potent anti-allergic agent. The anions, CuCl42- and CoCl42-, exhibit flattened tetrahedral and normal tetrahedral geometries, respectively.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, 1, 2

hkl

Structure factor file (CIF format)
Contains datablock 1

hkl

Structure factor file (CIF format)
Contains datablock 2

CCDC references: 128733; 128734

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