Abstract
Crystal structure of the title compound: [Cu2(bipy)2(pht)2]·4H2O (bipy=2,2′-bipyridine, pht=dianion of phthalic acid), CuBP·4H2O, consists of dinuclear entities, which are further connected by π–π stacking interactions between bipy ligands. In this way small channels (micropores) oriented parallel to the [001] direction and containing loosely hydrogen bonded water molecules are formed. The structural changes during dehydration–rehydration have been thoroughly investigated using TG/DSC analysis, FT-IR spectroscopy, X-ray powder diffraction, optical and scanning electron microscopy, and sorption experiments. In addition, dehydration process was analyzed from the aspect of kinetics. A complete reversibility of the dehydration–rehydration CuBP·4H2O(s)⇌CuBP(s)+4H2O(g) process was confirmed by all means. Therefore, CuBP·4H2O can be classified as molecular sieve with quite unexpected zero-dimensional structure.
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