A 3D POM-MOF composite based on Ni(II) ion and 2,2 '-bipyridy1-3,3 '-dicarboxylic acid: Crystal structure and proton conductivity

作者：Wei, Meilin^*; Wang, Xiaoxiang; Sun, Jingjing; Duan, Xianying

来源：Journal of Solid State Chemistry, 2013, 202: 200-206.

DOI：10.1016/j.jssc.2013.03.041

• Polyoxometalates
• Structure elucidation
• Conducting materials
• Metal-organic frameworks
• Proton transport

We have succeeded in constructing a 3D POM-MOF, {H[Ni(Hbpdc)(H2O)(2)](2)[PW12O40] center dot 8H(2)O}(n), (H(2)bpdc=2,2'-bipyridyl-3,3'-dicarboxylic acid), by the controllable self-assembly of H(2)bpdc, Keggin-anions and Ni2+ ions based on the electrostatic and coordination interactions. Interestingly, Hbpdc(-) as polydentate organic ligands and Keggin-anion as polydentate inorganic ligands are covalently linked transition-metal nickel at the same time. The title complex represents a new example of introducing the metal N-heterocyclic multi-carboxylic acid frameworks into POMs chemistry. Based on Keggin-anions being immobilized as part of the metal N-heterocyclic multi-carboxylic acid framework, the title complex realizes four approaches in the 1D hydrophilic channel used to engender proton conductivity in MOFs. Its water adsorption isotherm at room temperature and pressure shows that the water content in it was 31 cm(3) g(-1) at the maximum allowable humidity, corresponding to 3.7 water molecules per unit formula. It exhibits good proton conductivities (10(-4)-10(-3) S cm(-1)) at 100 degrees C in the relative humidity range 35-98%. The corresponding activation energy (E-a) of conductivity was estimated to be 1.01 eV.

• 出版日期2013-6
• 单位河南师范大学