Volume 60, Issue 16 pp. 9099-9105
Research Article

Metal-Organic Cages with Missing Linker Defects

Xianhui Tang

Xianhui Tang

School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240 China

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Dandan Chu

Dandan Chu

School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240 China

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Wei Gong

Wei Gong

School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240 China

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Prof. Yong Cui

Prof. Yong Cui

School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240 China

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Prof. Yan Liu

Corresponding Author

Prof. Yan Liu

School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240 China

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First published: 28 January 2021
Citations: 33

Graphical Abstract

Tetrahedral and hexahedral coordination cages with one or two missing linkers, as well as regular trigonal prismatic cages, are synthesized by employing steric hindrance of organic linkers to manipulate coordination modes of lanthanide(III) ions. The defective cages, especially the hexahedral cage, are conformationally flexible and adapt its structure to accommodate various guest molecules with sizes comparable or much larger than the cavity portals that are not accessible to the non-defective cage.

Abstract

We present here the controlled synthesis of defective coordination cages by employing steric hindrance of organic linkers to manipulate coordination modes of the assembled metal ions. Three chiral 1,1′-bi-2-naphthol (BINOL) derived bis-tridentate ligands L1L3 with pyridine-2,6-dicarboxamides (pcam) chelating moieties are therefore designed and synthesized, among which L3 has a smaller steric hindrance on the coordinating sites relative to the other two linkers. Complexes of L1 and L2 with lanthanides afford the irregular Ln8(L1)10 hexahedra with two missing edges and Ln4(L2)5 tetrahedra with one missing edge, respectively, both of which contain a 1:1 mixture of Ln(pcam)2 and Ln(pcam)3. In contrast, complex of L3 produces the regular twisted Ln6(L3)9 trigonal prisms without missing edges that contain only Ln(pcam)3 vertices. The defective cage has more freedom to adjust its structural conformation, affording adaptable cavity to accommodate a range of guest molecules with sizes comparable or much larger than the cavity portals.

Conflict of interest

The authors declare no conflict of interest.

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