Synthesis and characterization of a pair of temperature and cosolvent-dependent Zn(II)-organic frameworks containing a novel discrete single-walled Zn(II)-organic coordination polymer nanotube

The temperature and the cosolvent have great influence on the engineering of crystalline architectures of a pair of Zn(II)-organic frameworks with H2IIP and bbtz: the novel discrete single-walled Zn(II)-organic coordination polymer nanotube 1 and an interesting 3-D polycatenated array of layers 2. The dehydrated SWCPNT-1 exhibits reversible dehydration and rehydration from ambient air. A pair of temperature and cosolvent-controlled assemblies of one dimensional (1-D) and two dimensional (2-D) Zn(II)-organic frameworks (ZOFs] based on 5-iodoisophthalic acid (H2IIP) and an auxiliary flexible ligand, 1,4-bis(triazol-1-ylmethyl)benzene (bbtz) with different structures, has been rationally designed and successfully synthesized. Results show that when the reaction was carried out under ambient condition, the novel discrete single-walled Zn(II)-organic coordination polymer nanotube {[Zn(IIP)(bbtz)(H2O)]center dot H2O}(n) (SWCPNT-1), which shows a fascinating 3-D supramolecular interdigitated columnar microporous architecture supported by face to face pi center dot center dot center dot pi stacking interactions and hydrogen bonds, was generated, whereas under solvothermal condition at 120 degrees C, an interesting 3-D-polycatenated array of layers, [Zn(IIP)(bbtz)] (2), which further extends into a three-fold-interpenetrated 3-D supramolecular mesoporous framework with 1-D channels (ca. 3.46 x 1.54 nm(2)) through C-I center dot center dot center dot O halogen bonds would be obtained. Interestingly, the reversible in situ rapid rehydration from static air is significantly observed in the discrete SWCPNT-1, revealing its potential application as water absorbent and sensing material. The dehydrated SWCPNT-1 shows selective gas adsorption of CO2 over N-2. Luminescent studies show that SWCPNT-1, dehydrated SWCPNT-1, and 2 exhibit blue fluorescence in the solid state. The water molecules in SWCPNT-1 affect its fluorescent property.