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Postsynthetic Approach for the Rational Design of Chiral Ferroelectric Metal–Organic Frameworks

Author:
Mon, Marta, Ferrando-Soria, Jesús, Verdaguer, Michel, Train, Cyrille, Paillard, Charles, Dkhil, Brahim, Versace, Carlo, Bruno, Rosaria, Armentano, Donatella, Pardo, Emilio
Source:
Journal of the American Chemical Society 2017 v.139 no.24 pp. 8098-8101
ISSN:
1520-5126
Subject:
calcium, cations, coordination polymers, histidine, ligands
Abstract:
Ferroelectrics (FEs) are materials of paramount importance with a wide diversity of applications. Herein, we propose a postsynthetic methodology for the smart implementation of ferroelectricity in chiral metal−organic frameworks (MOFs): following a single-crystal to single-crystal cation metathesis, the Ca²⁺ counterions of a preformed chiral MOF of formula Ca₆ᴵᴵ{Cuᴵᴵ₂₄[(S,S)-hismox]₁₂(OH₂)₃}·212H₂O (1), where hismox is a chiral ligand derived from the natural amino acid l-histidine, are replaced by CH₃NH₃⁺. The resulting compound, (CH₃NH₃)₁₂{Cuᴵᴵ₂₄[(S,S)-hismox]₁₂(OH₂)₃}·178H₂O (2), retains the polar space group of 1 and is ferroelectric below 260 K. These results open a new synthetic avenue to enlarge the limited number of FE MOFs.
Agid:
6030996