Single crystal to single crystal (SC-to-SC) transformation from a nonporous to porous metal-organic framework and its application potential in gas adsorption and Suzuki coupling reaction through postmodification.
A new amino-functionalized strontium-carboxylate-based metal-organic framework (MOF) has been synthesized that undergoes single crystal to single crystal (SC-to-SC) transformation upon desolvation. Both structures have been characterized by single-crystal X-ray analysis. The desolvated structure shows an interesting 3D porous structure with pendent -NH2 groups inside the pore wall, whereas the solvated compound possesses a nonporous structure with DMF molecules on the metal centers. The amino group was postmodified through Schiff base condensation by pyridine-2-carboxaldehyde and palladium was anchored on that site. The modified framework has been utilized for the Suzuki cross-coupling reaction. The compound shows high activity towards the C-C cross-coupling reaction with good yields and turnover frequencies. Gas adsorption studies showed that the desolvated compound had permanent porosity and was microporous in nature with a BET surface area of 2052 m(2)  g(-1). The material also possesses good CO2 (8 wt %) and H2 (1.87 wt %) adsorption capabilities.
Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro (Portugal); Present address: Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan). rupamsen1@yahoo.com.
Rupam
R
Sen
Debraj
D
Saha
Subratanath
S
Koner
Paula
P
Brandão
Zhi
Z
Lin
cross-coupling; heterogeneous catalysis; metal-organic frameworks; strontium; structure elucidation