title: Selectivity and direct visualization of carbon dioxide and sulfur dioxide in a decorated porous host.
abstract: Understanding the mechanism by which porous solids trap harmful gases such as CO(2) and SO(2) is essential for the design of new materials for their selective removal. Materials functionalized with amine groups dominate this field, largely because of their potential to form carbamates through H(2)N(δ(-))···C(δ(+))O(2) interactions, thereby trapping CO(2) covalently. However, the use of these materials is energy-intensive, with significant environmental impact. Here, we report a non-amine-containing porous solid (NOTT-300) in which hydroxyl groups within pores bind CO(2) and SO(2) selectively. In situ powder X-ray diffraction and inelastic neutron scattering studies, combined with modelling, reveal that hydroxyl groups bind CO(2) and SO(2) through the formation of O=C(S)=O(δ(-))···H(δ(+))-O hydrogen bonds, which are reinforced by weak supramolecular interactions with C-H atoms on the aromatic rings of the framework. This offers the potential for the application of new 'easy-on/easy-off' capture systems for CO(2) and SO(2) that carry fewer economic and environmental penalties.
authors.affiliation: School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK. Sihai.Yang@nottingham.ac.uk
authors.forename: Sihai
authors.initials: S
authors.lastname: Yang
authors.forename: Junliang
authors.initials: J
authors.lastname: Sun
authors.forename: Anibal J
authors.initials: AJ
authors.lastname: Ramirez-Cuesta
authors.forename: Samantha K
authors.initials: SK
authors.lastname: Callear
authors.forename: William I F
authors.initials: WI
authors.lastname: David
authors.forename: Daniel P
authors.initials: DP
authors.lastname: Anderson
authors.forename: Ruth
authors.initials: R
authors.lastname: Newby
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Blake
authors.forename: Julia E
authors.initials: JE
authors.lastname: Parker
authors.forename: Chiu C
authors.initials: CC
authors.lastname: Tang
authors.forename: Martin
authors.initials: M
authors.lastname: Schröder