Creation of materials chemistry of"sponge crystals"porous single crystals based on a new principle

点击翻译按钮获取中文摘要

We found and defined“sponge crystals”as the single crystals having continuous voids within them, but unlike zeolites, no intrinsic structural pores. This new category includes molecular single crystals having continuous voids originating from series of neighboring vacancies(~ 1 nm) of the constituent large molecules, affording nanospaces in the crystals. A typical example of‘‘sponge crystals'' is(NH_4)_3PW_<12> O_<40>, which is insoluble to water. In this study we focused on microporosity of water-soluble(NH_4)_4SiW_<12> O_<40>.+ 1H MAS NMR could distinguish NH_4^+ bare on the pore walls. The introduction of acidic proton into the channel could be achieved by substitution of H^+ for NH_4^+. The chemistry of the sponge crystal was presented in contrast to the chemistry of zeolites.