科研之友
微信
新浪微博
Facebook
分享链接
摘要
An alkaline earth metal ion based bi-functional metal-organic framework {[Mg(4,4'-bpdc)(H2O)(3)](H2O)}(n) (where 4,4'-bpdc = 4,4'-biphenyl dicarboxylate) has been synthesized by simply stirring the precursors in water. The framework crystallizes in orthorhombic P-bca space group. The metal nodes of the complex are bridged by dicarboxylates in mu-fashion to form corrugated 2D coordination sheets. The neighbouring 2D sheets are further connected by hydrogen bonding interactions between the coordinated water molecules and the carboxylate oxygen atoms to form a 3D supramolecular structure. The small hydrophilic supramolecular pockets of the 3D supramolecular structure are filled by guest water molecules through hydrogen bonding interactions. The framework exhibits proton conductivity of 1.44 x 10(-5) S m(-1) at 303 K under vacuum and the proton transport in the framework follows the Grotthuss mechanism where the hydrogen bonded network acts as the proton transport pathway. The evacuated material, after removal of both coordinated and guest water molecules, retains its crystallinity but is not isostructural with the original framework. According to N-2 adsorption study the BET surface area and the total pore volume of the evacuated material are 39 m(2) g(-1) and 0.133 cc g(-1), respectively. The evacuated material can adsorb (175 cc g(-1) at P/P-0 similar to 0.99) and store (154 cc g(-1) at P/P-0 = 0.1) a decent amount of water molecules.
- 出版日期2016-11-1
