Modulating iodine adsorption in nanoporous metal-organic framework via cation exchange process

An anionic Zn(II) Metal-Organic Framework, [HDMA](2)[Zn-2(BDC )(3)(DMA)(2)]. 6DMF (HDMA(+): dimethylamonnium, BDC2-: 1,4-benzenedicarboxilate, DMA: dimethylamine, DMF: N, N'-dimethylformamide), was served as a host for encapsulating I-2. For comparison of the ad/desorption rates of iodide, the ion exchange process with organic cations have been done. Loading of the exchanged compounds were successfully done by suspending them in a solution of I-2 in cyclohexane. Powder X-ray diffraction experiments and IR analysis showed that the exchanged crystalline lattices after adsorption and desorption of iodide remained the same. The delivery of I-2 from the compounds performed in ethanol, were determined by UV/vis spectroscopy. Comparison of iodide adsorption and desorption rates in the exchanged compounds showed that presence of different organic cations have effective role in increasing iodine adsorption.