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Issue 26, 2018
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Cyclic (H2O)6 confined hexameric host–guest assemblies and aerial CO2 fixation by electron-rich neutral urea/thiourea scaffolds

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Abstract

One of the supreme anion binding building blocks exhibiting strong interplay among topology, complementarity and coordination over the last two decades is the tris(2-aminoethyl)amine skeleton. However, recognition of anions/hydrated anions within the self-assemblies of simplest phenyl-based tris(oxyurea/thiourea) neutral ligands has been underexplored from 1995 and more challenging, mainly because of the lack of π-acidic or electron-withdrawing substituents in aryl terminals, especially in the solid state. Herein, two simple tris(oxyurea) (L1) and tris(thiourea) (L2) electron-rich scaffolds are reported with comparatively less acidic terminal aromatic functionalization but still capable of trapping chair-shaped cyclic water hexamer within the infrequent fluoride encapsulated hexameric L1 core as well as divalent carbonate anion encapsulated dimeric capsular cage of L2via hydroxide ion induced aerial CO2 fixation. Moreover, L1 shows large dihydrogen phosphate dimer [(H2PO4)2] bound neutral dimeric pseudo-capsular assembly, while the thiourea analogue L2 exhibits chloride and acetate bound unimolecular capsular assembly and divalent sulfate bound dimeric cage via hydrogen-bonding activated proton transfer reaction.

Graphical abstract: Cyclic (H2O)6 confined hexameric host–guest assemblies and aerial CO2 fixation by electron-rich neutral urea/thiourea scaffolds

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Publication details

The article was received on 17 Apr 2018, accepted on 29 May 2018 and first published on 29 May 2018


Article type: Paper
DOI: 10.1039/C8CE00611C
Citation: CrystEngComm, 2018,20, 3741-3754
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    Cyclic (H2O)6 confined hexameric host–guest assemblies and aerial CO2 fixation by electron-rich neutral urea/thiourea scaffolds

    U. Manna and G. Das, CrystEngComm, 2018, 20, 3741
    DOI: 10.1039/C8CE00611C

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