3 years ago

Microporous Cyclic Titanium-Oxo Clusters with Labile Surface Ligands

Boon K. Teo, Juanzhu Yan, Zichao Tang, Chaowei Zhao, Weijie Zhang, Shuqi Dai, Haifeng Su, Shuichao Lin, Xumao Chen, Nanfeng Zheng, Ying-Zi Han
By combining the use of ethylene glycol and monocarboxylic acid as surface ligands, a series of cyclic Ti-oxo clusters with permanent microporosity are successfully synthesized. With a cyclic {Ti32O16} backbone made of eight Ti4 cages arranged in a zigzag fashion, the clusters have a "donut" shape with inner diameter of 8.3 Å, outer diameter of 26.9 Å and height of 10.4 Å. While both inner and outer walls of the "donut" clusters are modified by double-deprotonated ethylene glycolates, their upper and lower surfaces are bound by carboxylates and mono-deprotonated ethylene glycolates. The clusters are readily packed into one-dimensional tubes which are further arranged in two different modes into crystalline microporous solids with surface areas over 660 m2/g. Moreover, the mono-deprotonated ethylene glycolates on the clusters are highly exchangeable by other alcohols, providing a nice platform for creating microporous solids or films with a wide variety of surface functionalities.

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

DOI: 10.1002/anie.201709096

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