Anion Exchange in Coordination-Network Materials

作者：Phuengphai Pongthipun; Massera Chiara; Reedijk Jan; Youngme Sujittra^*; Gamez Patrick

来源：European Journal of Inorganic Chemistry, 2013, 2013(27): 4812-4822.

DOI：10.1002/ejic.201300510

• Metal-organic frameworks
• Host-guest systems
• Coordination polymers
• Porous materials
• Zinc

Six coordination polymers, namely, the three-dimensional frameworks {[Zn-3(4,4-bpy)(3.5)(-O2CH)(4)(H2O)(2)](ClO4)(2)(H2O)(2)}(n) (1, 4,4-bpy = 4,4-bipyridine) and {[Zn-3(4,4-bpy)(3.5)(-O2CH)(4)(H2O)(2)](PF6)(2)}(n) (2), the two-dimensional networks {[Zn(4,4-bpy)(-O2CH)(H2O)(2)](CF3SO3)(H2O)}(n) (3) and {[Zn-3(4,4-bpy)(4)(-O2CCH2CH3)(4)](ClO4)(2)(4,4-bpy)(2)(H2O)(4)}(n) (4), the one-dimensional double-stranded zigzag chain {[Zn-3(4,4-bpy)(4)(-O2CCH2CH3)(4)(H2O)(2)](PF6)(2)(H2O)(2)}(n) (5), and the one-dimensional double-ladder chain {[Zn-2(4,4-bpy)(2)(-O2CCH2CH3)(2)(H2O)(2)](CF3SO3)(2)}(n) (6), have been prepared. The solid-state structures of the six compounds all exhibit void spaces that contain anions and neutral guest molecules, namely, water for 1, 3 and 5, and water/4,4-bpy for 4. The anion-exchange properties of the compounds have been investigated by monitoring the substitution of the ions by infrared spectroscopy. Furthermore, X-ray powder diffraction studies and elemental analyses have been used to further confirm the anion exchange. The results show that the anions in all compounds can be replaced with ClO4- or PF6- for 1, 2, 4, and 5, ClO4- and PF6- for 3, and ClO4-, PF6-, and BF4- for 6. Furthermore, compound 1 shows interesting reversible anion-exchange properties in aqueous solution.

• 出版日期2013-9-10