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Tuning the Surface Hydrophobicity of Keplerate {Mo72Fe30} Porous Molecular Capsules by Surface Ligand-Replacement Process

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Abstract

A spontaneous ligand-replacement process at the external surface of Keplerate polyoxometalate molecular nanocapsules {Mo72Fe30} occurs when dissolving {Mo72Fe30} in pure methanol, with the water ligands coordinated to the Fe(III) centers of {Mo72Fe30} gradually being replaced by CH3OH ligands, resulting in the formation of partially hydrophobic nanocapsules. The new nanocapsules have negligible deprotonation capability and different solution behaviors. The methanol ligands can be easily exchanged back to water ligands when a small amount of water is added into the system. The exchange of water ligands dramatically changed the self-assembly behaviors of the {Mo72Fe30} clusters in solution.

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Acknowledgments

T.L. acknowledges the support from NSF (CHE1305756), the Materials Science of Actinides Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001089 and the University of Akron.

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Authors and Affiliations

  1. Department of Polymer Science, University of Akron, Akron, OH, 44325, USA

    Dong Li & Tianbo Liu

  2. Department of Chemistry, Lehigh University, Bethlehem, PA, 18015, USA

    Dong Li, Joseph M. Pigga, Guang Liu & Tianbo Liu

Authors
  1. Dong Li
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  2. Joseph M. Pigga
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  3. Guang Liu
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  4. Tianbo Liu
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Correspondence to Tianbo Liu.

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Li, D., Pigga, J.M., Liu, G. et al. Tuning the Surface Hydrophobicity of Keplerate {Mo72Fe30} Porous Molecular Capsules by Surface Ligand-Replacement Process. J Clust Sci 28, 745–755 (2017). https://doi.org/10.1007/s10876-016-1105-9

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