Crystal engineering on superpolyhedral building blocks in metal–organic frameworks applied in gas adsorption. Issue 6 (1st December 2015)

• Record Type: Journal Article
• Authors: Chen, Ying‐Pin; Liu, Tian‐Fu; Fordham, Stephen; Zhou, Hong‐Cai
• Is Part Of: Acta crystallographica. Volume 71:Issue 6(2015:Dec.)
• Page Start: 613
• Page End: 618
• Publication Date: 2015-12-01
• Subjects: supermolecular building blocks -- metal–organic frameworks -- gas adsorption -- polyhedra
• DOI: 10.1107/S205252061501584X
• Languages: English
• ISSNs: 2052-5206

Abstract

Abstract : Two metal–organic frameworks [PCN‐426(Ni) and PCN‐427(Cu)] have been designed and synthesized to investigate the structure predictability using a SBB (supermolecular building blocks) approach. Tetratopic ligands featuring 120° angular carboxylate moieties were coordinated with a [Ni3 (μ3 ‐O)] cluster and a [Cu2 O2 ] unit, respectively. As topologically predicted, 4‐connected networks with square coordination adopted the nbo net for the Ni‐MOF and ssb net for the Cu‐MOF. PCN‐426(Ni) was augmented with 12‐connected octahedral SBBs, while PCN‐427(Cu) was constructed with tetragonal open channels. After a CO2 supercritical drying procedure, the PCN‐426(Ni) possessed a Brunauer–Emmett–Teller (BET) surface area as high as 3935 m 2 g −1 and impressively high N2 uptake of 1500 cm 3 g −1 . This work demonstrates the generalization of the SBB strategy, finding an alternative to inconvenient synthetic processes to achieve the desired structural features.