Zn-MOFs containing flexible α,ω-alkane (or alkene)- dicarboxylates and 1,2-bis(4-pyridyl)ethane ligands: CO2 sorption and photoluminescence

In Hong Hwang, Ha Yeong Kim, Myoung Mi Lee, Yu Jeong Na, Jin Hoon Kim, Hyun Chul Kim, Cheal Kim, Seong Huh, Youngmee Kim, Sung Jin Kim

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The use of five flexible α,ω-alkane (or alkene)-dicarboxylates (succinate (2), fumarate (3), adipate (5), and muconate (6)) produced three-dimensional (3-D) ZnII frameworks with 1,2-bis(4-pyridyl)ethane pillars, whereas glutarate gave a two-dimensional (2-D) ZnII compound (4). Structures 2 and 5 are 4-fold interpenetrated networks, and 3 and 6 are 5-fold interpenetrated networks. Both 5 and 6 displayed good CO 2 sorption capabilities at 196 K, as evidenced by S-shape adsorption isotherms. Both compounds also exhibited selective CO2 sorption over N2 at low temperature, while 5 containing an adipate ligand showed higher CO2 uptake at 273 and 298 K than 6 with a more rigid muconate ligand. The isosteric heats of CO2 adsorption for 5 and 6 were 23.1 kJ mol-1 and 30.7 kJ mol-1, respectively. A photoluminescence study showed the emissions of 2, 4, and 5 to be blue-shifted relative to both the free acids and ligand, while 3 had ligand-based luminescence properties. The thermal stabilities of these complexes were also examined.

Original languageEnglish
Pages (from-to)4815-4823
Number of pages9
JournalCrystal Growth and Design
Volume13
Issue number11
DOIs
StatePublished - 6 Nov 2013

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