5 years ago

Modification and Restacking of Layered Terbium Hydroxide 2D Crystals

Xinying Wang, Baiyi Shao, Xiaojing Yang, Pingping Feng
We report that the 2D crystals, prepared through delamination of the dodecyl sulfate ions (DSˉ)-intercalated layered terbium hydroxide (LTbH) in formamide, can be modified by DSˉ ions and further restacked to a new layer-structured compound. The modification proceeds in situ in formamide through the substitution of DSˉ for the hydroxyl which coordinates to Tb3+ on the delaminate LTbH layer. With the supplementary addition of DSˉ, the substitution reaction progresses to have a large substitute degree, m > 2 in the chemical formula Tb2(OH)6-mDSm·nH2O. Since the negatively-charged SO42- heads of DSˉ anchor to Tb3+, the alkyl chains protruding outwards convert the 2D crystal from hydrophilic to hydrophobic. The modified 2D crystals aggregate in the aqueous medium, restacking to the layered rare-earth compound, characteristic of m greater than 2. The restacked crystals are ready to delaminate in some organic solvents owning to the structural and hydrophobic features.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700825

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