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NaGaS 2 : An Elusive Layered Compound with Dynamic Water Absorption and Wide‐Ranging Ion‐Exchange Properties
Author(s) -
Klepov Vladislav V.,
Berseneva Anna A.,
Pace Kristen A.,
Kocevski Vancho,
Sun Mengqi,
Qiu Peng,
Wang Hui,
Chen Fanglin,
Besmann Theodore M.,
Loye HansConrad
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202001203
Subject(s) - uranyl , chalcogenide , absorption (acoustics) , ternary operation , chemistry , aqueous solution , ion exchange , molecule , ion , exfoliation joint , coordination complex , metal , crystallography , inorganic chemistry , materials science , nanotechnology , graphene , organic chemistry , computer science , composite material , programming language
Most ternary sulfides belonging to the MGaS 2 structure‐type have been known for many years and are well‐characterized. Surprisingly, there have been no reports of the NaGaS 2 composition, which contains Na, a monovalent cation slightly larger in size than Li, found in LiGaS 2 , a compound known for its non‐linear optical properties. Now it is demonstrated for the first time that the unique reversible water absorption in NaGaS 2 has resulted in its absence from previous reports owing to difficulties encountered when characterizing this compound by SC XRD. The layered structure of this compound coupled with uniquely easy migration of water molecules between the layers allows for ion exchange with 3d and 5f metal cations. Some cations, for example, Ni 2+ , facilitate exfoliation of the layers, providing a facile synthetic route to a new class of 2D chalcogenide materials and furthermore demonstrating that NaGaS 2 can readily uptake uranyl species from aqueous solutions.