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Issue 9, 2012
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Ammonium–crown ether based host–guest systems: N–H⋯O hydrogen bond directed guest inclusion featuring N–H donor functionalities in angular geometry

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Abstract

This article demonstrates crown ether based host–guest adduct formation in a series of crystalline solids 1–7, in which ammonium-type cationic guests have been integrated with various crown ethers. Addition of more than two equivalents of perchloric acid to an acetonitrile solution of 3-aminopyridine (3AmPy), 4,4′-diaminodiphenylmethane (DADPM) or 4,4′-diaminodiphenylether (DADPE) generates the doubly protonated anilinium (or ammonium) cationic species (written as 3AmPyH2, DADPMH2 and DADPEH2 respectively) which act as guests to the various crown ether hosts present in solution. The relevant compounds crystallize as their perchlorate salts and they have been structurally characterized through X-ray diffraction. The major driving force towards host–guest complexation in the compounds 1–7 is found to be the N–H⋯O hydrogen-bond interactions between the aforementioned guests and the crown ether hosts.

Graphical abstract: Ammonium–crown ether based host–guest systems: N–H⋯O hydrogen bond directed guest inclusion featuring N–H donor functionalities in angular geometry

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Publication details

The article was received on 18 Jan 2012, accepted on 31 Jan 2012 and first published on 31 Jan 2012


Article type: Paper
DOI: 10.1039/C2RA20109G
Citation: RSC Adv., 2012,2, 3920-3926
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    Ammonium–crown ether based host–guest systems: N–H⋯O hydrogen bond directed guest inclusion featuring N–H donor functionalities in angular geometry

    M. Sarma, T. Chatterjee and S. K. Das, RSC Adv., 2012, 2, 3920
    DOI: 10.1039/C2RA20109G

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