A permanently porous single molecule H-bonded organic framework for selective CO2 capture

Permanent porosity has been realized in a hydrogen bonded framework formed by a single tripodal tricarboxylic acid molecule. The presence of three phenyl rings linked to a flexible sp(3) nitrogen centre renders a near-propeller shape to the molecule generating an unusual 'non-planar' 3-D f...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2016-05, Vol.52 (45), p.7249-7252
Main Authors: Nandi, Shyamapada, Chakraborty, Debanjan, Vaidhyanathan, Ramanathan
Format: Article
Language:English
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Summary:Permanent porosity has been realized in a hydrogen bonded framework formed by a single tripodal tricarboxylic acid molecule. The presence of three phenyl rings linked to a flexible sp(3) nitrogen centre renders a near-propeller shape to the molecule generating an unusual 'non-planar' 3-D framework formed by highly directional planar -COOHHOOC- hydrogen bonds, propagating in all three directions. The material shows exceptional hydrolytic, acidic and thermal stability and has a surface area of 1025 m(2) g(-1). Importantly, it shows preferential adsorption of CO2 over N2 with very high selectivities (350 : 1@1 bar, 303 K). DFT modeling shows the presence of stable T-shaped CO2CO2 dimers within the channels suggesting favorable co-operativity between them.
ISSN:1364-548X
DOI:10.1039/c6cc02964g