Dalton Transactions | VOL. 49
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Tetrazole-based porous metal–organic frameworks for selective CO2 adsorption and isomerization studies

Publication Date Jan 1, 2020

Abstract

Tetrazole-based molecules have numerous bridging coordination modes which afford great synthetic possibilities for the preparation of porous metal-tetrazolate architectures for many applications, such as carbon capture. We reported here three tetrazole-based MOFs: 1, {[Cu12 (ttz) 8/3Cl5 (H2O) 16] 11 + · 11Cl-} n (H3ttz = N2,N4,N6-tris (4-(1H-tetrazol-5-yl) phenyl)-1,3,5-triazine-2,4,6-triamine), contains highly positively charged Cu12 clusters and the largest mesopores (32 Å) among the reported MOFs based on a tri-topic tetrazole ligand. 2 and 3 are two MOF isomers built by using CuII and 2-(1H-tetrazol-5-yl) pyrimidine. 3 contains nonporous layers, while 2 contains 1D channels and showed high selectivity for adsorbing CO2, which should be attributed to the high density of free nucleophilic tetrazole N atoms on the pore surfaces. We found that the isomerization between 2 and 3 was caused by the diverse coordination modes of tetrazole-based ligands and can be controlled in synthesis processes.

Concepts
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Tetrazole
Selective CO2 Adsorption
Diverse Coordination Modes
Nonporous Layers
Isomerization Studies
Adsorption
Reported
Carbon
1D Channels
Controlled

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