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The first example of one single crystal (NTOU-5) containing two different organic-inorganic hybrid open-framework structures was obtained using a hydro(solvo)thermal method and structurally characterized by single-crystal X-ray diffraction. Remarkably, under the same synthetic conditions, the zinc ions are respectively coordinated by oxalic acid and 1,2,4,5-tetrakis(imidazole-1-ylmethyl)benzene linkers to form two significantly different frameworks: anionic [Zn2(OX)3]2- and cationic [Zn(TIMB)]2+ networks that interweave with each other to give an unprecedented interpenetrating structure with two differently-bonded open-frameworks. From the inorganic chemistry perspective, it is extremely difficult to control to which metal center do the oxygen-donor liners or/and nitrogen-donor ligands bind. A mixed Co/Zn analogue was also obtained via a similar method. The single-crystal XRD and EDS analyses indicate that the octahedral Zn ions of the anionic frameworks are replaced by cobalt cations, whereas the Zn ions in the tetrahedral positions of the cationic networks remain intact. This leads to the formation of the interpenetrating analogue with a mixed metal composition. Furthermore, NTOU-5 shows its structural stability and efficiently removes organic dyes from aqueous solutions at concentrations as low as 10 ppm.
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Name: Chemistry (Weinheim an der Bergstrasse, Germany)
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