Abstract
Layered double hydroxides of type [Zn 2Cr(OH) 6]X · nH 2O where X − = 1 2 mal 2−, cis-[Cr(mal) 2(H 2O) 2] −, and 1 3 [Cr(mal) 3] 3− (mal = malonate) were synthesized by anion exchange reactions. These compounds were characterized by X-ray powder diffractometry and IR spectroscopy and the results were compared with those of the compounds where X − = F −, 1 2 CO 3 2−, and NO 3 −. The IR data allow the significant distinction between hydroxide layer OH-groups forming H-bonds with (i) crystal water and (ii) intercalated anions. With reference to the forces regarding the second H-bonding interaction the following order became obvious: NO 3 − < [Cr(mal) 3] 3− < F − ≈ CO 3 2− < mal 2− ≈ cis-[Cr(mal) 2(H 2O) 2] −. Propositions of the malonate arrangements in the interlayer were discussed. The malonate ligands of both anionic complexes are situated with an angle of 54.75° to the plane of OH close packing. The found differences between both are assumed to be caused by spatial reasons.
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