2011 Fiscal Year Final Research Report

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

Research Project

Project/Area Number	22655070
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Single-year Grants
Research Field	Inorganic industrial materials
Research Institution	Hiroshima University
Principal Investigator	INUMARU Kei 広島大学, 大学院・工学研究院, 教授 (80270891)
Project Period (FY)	2010 – 2011
Keywords	結晶 / 多孔体 / 多孔質単結晶 / ゼオライト
Research Abstract	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.