27. A Series of Unprecedented Linear Mixed‐Metal‐Substituted Polyoxometalate Trimers: Syntheses,

Structures, Luminescence, and Proton Conductivity Properties

Z. Li, L. D. Lin, D. Zhao, Y. Q. Sun*, S. T. Zheng*,  Eur. J. Inorg. Chem, 2019, 437-441.