4 years ago

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

Postsynthetic Approach for the Rational Design of Chiral Ferroelectric Metal–Organic Frameworks
Brahim Dkhil, Cyrille Train, Marta Mon, Emilio Pardo, Rosaria Bruno, Michel Verdaguer, Jesús Ferrando-Soria, Donatella Armentano, Carlo Versace, Charles Paillard
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.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b03633

DOI: 10.1021/jacs.7b03633

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