Abstract
A 3D supramolecular network, [Cd(bipy)(C4O4)(H2O)2]·3H2O (1) (bipy = 4,4′-bipyridine and C4O42− = dianion of H2C4O4), constructed by mixed-ligand two-dimensional (2D) metal-organic frameworks (MOFs) has been reported and structurally determined by the single-crystal X-ray diffraction method and characterized by other physicochemical methods. In 1, the C4O42− and bipy both act as bridging ligands connecting the Cd(II) ions to form a 2D layered MOF, which are then extended to a 3D supramolecular network via the mutually parallel and interpenetrating arrangements among the 2D-layered MOFs. Compound 1 shows a two-step dehydration process with weight losses of 11.0% and 7.3%, corresponding to the weight-loss of three guest and two coordinated water molecules, respectively, and exhibits an interesting reversible single-crystal-to-single-crystal (SCSC) structural transformation upon de-hydration and re-hydration for guest water molecules. The SCSC structural transformation have been demonstrated and monitored by single-crystal and X-ray powder diffraction, and thermogravimetic analysis studies.
Highlights
Porous materials based on coordination polymers (CPs), or metal-organic frameworks (MOFs) [1,2] containing guest molecules are very attractive research field, owing to their designable structure, unusual flexibilities, and on their tunable functional application [3,4,5,6,7,8,9,10,11,12]
Compound 1 was synthesized by solution method instead of hydrothermal method reported in previous study [52]
The crystal structure of 1, synthesized by the solution method, is re-determined and is almost the same as the crystal structure described in our previous report [52], with a 3D microporous supramolecular network being constructed by 2D-layered MOFs
Summary
Porous materials based on coordination polymers (CPs), or metal-organic frameworks (MOFs) [1,2] containing guest molecules are very attractive research field, owing to their designable structure, unusual flexibilities, and on their tunable functional application [3,4,5,6,7,8,9,10,11,12].In this field, dynamic porosity has been paid much attention on the structural characteristics, as well as on the function of guest inclusions [13,14,15,16,17,18,19,20,21,22,23,24,25]. Porous materials based on coordination polymers (CPs), or metal-organic frameworks (MOFs) [1,2] containing guest molecules are very attractive research field, owing to their designable structure, unusual flexibilities, and on their tunable functional application [3,4,5,6,7,8,9,10,11,12]. N,N-based ligands, such as 4,40 -bipyridine (bipy) and pyrazine, have been widely used on the construction of Crystals 2017, 7, 364; doi:10.3390/cryst7120364 www.mdpi.com/journal/crystals
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