Six new calcium metal−organic frameworks [Ca(BDC)(DMF)(H 2 O)] ( 1 ), [Ca(ABDC)(DMF)] ( 2 ), [Ca 3 (BTC) 2 (DMF) 2 (H 2 O) 2 ]·3H 2 O ( 3 ), [Ca(H 2 dhtp)(DMF)] ( 4 ), [Ca(H 2 dhtp)(DMF) 2 ] ( 5 ), and one modification of [Ca(H 2 dhtp) 2 (H 2 O) 2 ] ( 6 ), (DMF = N,N -dimethylformamide; BDC = 1,4-benzenedicarboxylate anion; ABDC = 2-aminobenzene-1,4-dicarboxylate anion; BTC = 1,3,5-benzenetricarboxylate anion; H 2 dhtp = 2,5-dihydroxyterephthalate anion) were synthesized from calcium ions and aromatic carboxylic acids by solvothermal reactions and microwave-assisted solvothermal reactions. The single crystal structure analysis showed that all complexes display three-dimensional structures containing various inorganic motifs with helical or straight one-dimensional inorganic chains ( 1 − 3 ), pentagonal bipyramidal dimers ( 4 and 6 ), or discrete octahedra ( 5 ) connected through organic linkers and forming DMF- or water-coordinated neutral frameworks. It is also interesting that compounds 1 − 5 undergo dissolution/reorganization reactions comprising a break and reformation of the Ca−O bond and leading to destruction/construction structural transformations. Compounds 1 − 5 were further characterized by thermal gravimetric analysis, powder X-ray diffraction, UV−vis, infrared, and PL spectroscopy.
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Liang et al. (2011) studied this question.
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