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Scientists Prepare Soluble and Stable Ti4L6 Tetrahedron with Coordination Assembly Function

Nov 28, 2017     Email"> PrintText Size

In the past decades, polyhedral coordination cages have attracted great attention due to their aesthetically appealing structures and wide applications in various fields. Most of the research focused on constructing discrete cages, and their further assembly into advanced supramolecular materials has been less developed. Metal-organic cages based on the earth abundant Ti are relatively less, which might have potential applications as photoactive materials.

Recently, Team of Synthetic Inorganic Chemistry led by Prof. ZHANG Jian and Prof. ZHANG Lei at the State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter of Chinese Academy of Sciences, has successfully prepared a tetrahedral Ti4L6 cage with calixarene-like coordination active vertices, which can be readily assembled by transition and lanthanide metal ions and presents efficient and selective photocatalytic activities. The study was published in J. Am. Chem. Soc. 

The obtained Ti4L6 cage was featured by high solubility and stability in H2O and DMF/H2O solution. In addition with its calixarene-like coordination active vertices, this Ti4L6 cage showed interesting stepwise assembly function with other metal ions. Through trapping different amounts of Co or Ln ions, it can be organized into Ti4L6-Co3 cage, Ti4L6-Ln2 cage, Ti4L6-Ln2 chain and three-dimensional (3D) Ti4L6-Ln framework. of the Ti4L6 cage and the dye molecules.

Moreover, the Ti4L6 cage also showed selective and efficient homogeneous photodecomposition of acid blue 93 (AB-93) and alkali blue 4B (AB-4B) driven by visible light, which might be attributed to N-H×××O hydrogen bonding between the calixarene-like oxygen vertices

This work provided a Ti4L6 cage not only possesses interesting coordination assembly function, but also shows important photoactive applications.

 

Illustration of the solubility and stepwise assembly of the Ti4L6 cage (Image by Prof. ZHANG’s Group) 

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(Editor: LIU Jia)

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