Stimuli-responsive supramolecular assemblies are dynamic systems that can reversibly switch between different states upon external stimuli. In this context, metal coordination offers a reliable strategy for the preparation of stimuli responsive supramolecular architectures. Herein we report the preparation of a solvent-responsive cavitand-lanthanum coordination complex. A tetra-phosphonate cavitand has been functionalized with four hydroxyl moieties at the upper rim to form a pre-organized octadentate ligand capable of binding lanthanum salts. Exploiting the orthogonal recognition sites, two different complex architectures are formed in acetonitrile and acetone, respectively. The complexes have been characterized in solution by NMR spectroscopy, ITC experiments, while at the solid state, the single crystal structure of the acetonitrile derivative has been determined. Furthermore, as observed by DOSY-NMR spectroscopy, small quantities of acetone in acetonitrile are sufficient to trigger assembly interconversion.

Solvent-responsive cavitand lanthanum complex / Guagnini, Francesca; Pedrini, Alessandro; Swager, Timothy M; Massera, Chiara; Dalcanale, Enrico. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - 48:36(2019), pp. 13732-13739. [10.1039/c9dt03199e]

Solvent-responsive cavitand lanthanum complex

Guagnini, Francesca;Pedrini, Alessandro;Massera, Chiara
;
Dalcanale, Enrico
2019-01-01

Abstract

Stimuli-responsive supramolecular assemblies are dynamic systems that can reversibly switch between different states upon external stimuli. In this context, metal coordination offers a reliable strategy for the preparation of stimuli responsive supramolecular architectures. Herein we report the preparation of a solvent-responsive cavitand-lanthanum coordination complex. A tetra-phosphonate cavitand has been functionalized with four hydroxyl moieties at the upper rim to form a pre-organized octadentate ligand capable of binding lanthanum salts. Exploiting the orthogonal recognition sites, two different complex architectures are formed in acetonitrile and acetone, respectively. The complexes have been characterized in solution by NMR spectroscopy, ITC experiments, while at the solid state, the single crystal structure of the acetonitrile derivative has been determined. Furthermore, as observed by DOSY-NMR spectroscopy, small quantities of acetone in acetonitrile are sufficient to trigger assembly interconversion.
2019
Solvent-responsive cavitand lanthanum complex / Guagnini, Francesca; Pedrini, Alessandro; Swager, Timothy M; Massera, Chiara; Dalcanale, Enrico. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - 48:36(2019), pp. 13732-13739. [10.1039/c9dt03199e]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2863123
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