A permanently porous single molecule H-bonded organic framework for selective CO2 capture. Issue 45 (13th May 2016)

• Record Type: Journal Article
• Authors: Nandi, Shyamapada; Chakraborty, Debanjan; Vaidhyanathan, Ramanathan
• Is Part Of: Chemical communications. Volume 52:Issue 45(2016)
• Page Start: 7249
• Page End: 7252
• Publication Date: 2016-05-13
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/c6cc02964g
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : CO2 adsorption in a single molecule hydrogen-bonded framework, with the CO2 's oriented as T-shaped dimers, resembling those in solid-state CO2 . Abstract : 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 –COOH⋯HOOC– 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 CO2 ⋯CO2 dimers within the channels suggesting favorable co-operativity between them.