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Imidazole-containing compounds exhibit a myriad of pharmacological activities. Two tetra-chlorido-zincate salts of 4-carb-oxy-1 H -imidazol-3-ium, ImHCO 2 H + , are reported. Bis(4-carb-oxy-1 H -imidazol-3-ium) tetra-chlorido-zincate monohydrate, (C 4 H 5 N 2 O 2 ) 2 [ZnCl 4 ]·H 2 O, (I), crystallizes as a monohydrate salt, while bis-(4-carb-oxy-1 H -imidazol-3-ium) tetra-chlorido-zincate bis-(1 H -imidazol-3-ium-4-carboxyl-ato) monohydrate, (C 4 H 5 N 2 O 2 ) 2 [ZnCl 4 ]·2C 4 H 4 N 2 O 2 ·H 2 O, (II), is a co-crystal salt with six residues: two ImHCO 2 H + cations, two formula units of the zwitterionic 1 H -imidazol-3-ium-4-carboxyl-ate, ImHCO 2 , one tetra-chlorido-zincate anion and one water mol-ecule disordered over two sites in a 0.60 (4):0.40 (4) ratio. The geometric parameters of the ImHCO 2 H + and the ImHCO 2 moieties are the same within the standard uncertainties of the measurements. Both compounds exhibit extensive hydrogen bonding, including involvement of the tetra-chlorido-zincate anion, resulting in inter-connected chains of anions joined by water mol-ecules.

Structural characterization of two tetrachloridozincate salts of 4-carboxy-1H-imidazol-3-ium: a salt hydrate and a co-crystal salt hydrate