Galán A, Valderrey V, Ballester P. Ordered co-encapsulation of chloride with polar neutral guests in a tetraurea calix[4]pyrrole dimeric capsule.
Chem Sci 2015;
6:6325-6333. [PMID:
30090250 PMCID:
PMC6054108 DOI:
10.1039/c5sc02024g]
[Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 07/09/2015] [Indexed: 01/08/2023] Open
Abstract
A calix[4]pyrrole tetraurea, a polar guest and methyltrioctylammonium chloride quantitatively self-assemble in two different complexes in response to the components' stoichiometry.
In this work, we describe the stoichiometrically controlled self-assembly process of tetraurea calix[4]pyrrole 1 with a polar neutral guest, trimethylamine N-oxide or beta-alanine betaine, and methyltrioctylammonium chloride (MTOACl) salt into two supramolecular architectures which differ in morphology and stoichiometry. Whereas an equimolar solution of tetraurea calixpyrrole 1, polar guest and MTOACl produces a four-particle inclusion assembly, a mixture of the same components in a 2 : 1 : 1 molar ratio induces the formation of a dimeric capsular assembly displaying multiple guests which are orderly co-encapsulated. The influence of other polar guests and ammonium salts on the self-assembly process is also described.
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