Stepwise Encapsulation of Sulfate Ions by Ferrocenyl-Functionalized Tripodal Hexaurea Receptors
作者:Xiaojuan Huang、Biao Wu、Chuandong Jia、Benjamin P. Hay、Minrui Li、Xiao-Juan Yang
DOI:10.1002/chem.201300275
日期:2013.7.1
Three ferrocenyl‐functionalizedtripodal hexaurea anionreceptors with ortho‐ (L2), meta‐ (L3), and para‐phenylene (L4) bridges, which showed strong binding affinities toward sulfate ions, have been designed and synthesized. In particular, meta‐phenylene‐bridged ligand L3, owing to its trigonal bipyramidal structure, can encapsulate two SO42− ions in its “inner” and “outer” tripodal clefts, respectively
Highly Efficient Extraction of Sulfate Ions with a Tripodal Hexaurea Receptor
作者:Chuandong Jia、Biao Wu、Shaoguang Li、Xiaojuan Huang、Qilong Zhao、Qian-Shu Li、Xiao-Juan Yang
DOI:10.1002/anie.201004461
日期:2011.1.10
Fatal extraction: The Hofmeister bias for sulfateions in aqueous environments can be overcome by using a tripodalhexaureareceptor (L) that completely encapsulates the sulfateion in a complementary cavity protected by hydrophobic aromatic rings (see picture; C gray, N blue, O red, S yellow). Almost quantitative extraction of sulfateions from an aqueous to an organic phase is achieved when this
Absorption of Atmospheric CO<sub>2</sub> as Carbonate Inside the Molecular Cavity of a New Tripodal Hexaurea Receptor
作者:Avijit Pramanik、Maryam Emami Khansari、Douglas R. Powell、Frank R. Fronczek、Md. Alamgir Hossain
DOI:10.1021/ol403186k
日期:2014.1.17
A new hexaurea receptor has been synthesized, which absorbs atmospheric CO2 to produce an air-stable solid carbonate complex under normal conditions. Structural analysis of the carbonate complex with this receptor suggests that the carbonate is fully encapsulated within its highly organized intramolecular cavity via 12 strong NH center dot center dot center dot O bonds in the range of 2.703(3)-2.989(3) angstrom from six urea units, with each anionic oxygen coordinated via four NH center dot center dot center dot O bonds with two urea groups.