2014) Syntheses and structural characterization of six ionic salts based on bis(benzimidazole)/bis(imidazole) and perchlorometallates of Due to the weak interactions, the compound displays 3-D layer structure. Six salts, ([(H 2 L1)(ZnCl 4 )] (1) (L1 = 1,1′-bis(benzimidazolyl)methane), [(H 2 L1)(CuCl 4 )]·H 2 O (2), [(H 2 L2)(ZnCl 4 )] (3) (6) (L4 = 3,6-bis(imidazol-1-yl)pyridazine)), derived from bis(benzimidazole)/ bis(imidazole) and metal(II) chloride dihydrate (zinc(II) chloride and copper(II) chloride dihydrate) were prepared and characterized by IR, X-ray structure analysis, elemental analysis, and TG analysis. The aromatic rings of the cations in all of the compounds are planar. X-ray diffraction analysis revealed that all the complexes have 3-D layer network structures built from hydrogen bonds between the cations and chlorometallate anions. Water molecules also play an important role in structure extension in 2, 5, and 6. The arrangements of the anions and cations in their solid state are dominated not only by size and symmetry of the cations, but also by the non-covalent interactions existing in the crystal structures.

Four zinc(II) complexes, namely, Zn(Hdmpz) 2 (L1) 2 (1) (Hdmpz = 3,5-dimethylpyrazole, HL1 = trichloroacetic acid), Zn(Hdmpz) 2 (L2) 2 (2) (HL2 = 2,4-dichlorophenoxyacetic acid), [Zn 2 (μ-dmpz) 2 (Hdmpz) 2 (L3) 2 ] (3) (HL3 = 1-naphthylacetic acid), and [Zn(Hdmpz) 2 (L4) 2 ]·H 2 O (4) (HL4 = indole-3-acetic acid) were prepared and structurally characterized by different techniques including elemental analysis, IR spectroscopy, TG, and single-crystal X-ray diffraction analysis. The complexes display 2D to 3D structures with tetrahedral to pentagonal coordination around the central zinc atom. The X-ray studies suggested that 1, 2, and 4 are mononuclear complexes, whereas 3 is a centrosymmetric dinuclear complex. The pyrazole li-

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