Abstract
A new ring-shaped 12-Ti-substituted poly(polyoxometalate) (poly(POM)), K10H15[{K2Na(H2O)3}@{(Ti2O)2(Ti4O4)2(A-α-1,3,5-GeW9O36)2(A-α-2,3,4-GeW9O36)2}]·45H2O (1), has been made under hydrothermal conditions, showing the highest number of Ti centers in Keggin-type poly(POM) family to date. Its obvious feature is that two types of novel chiral trivacant [GeW9O36]14−(A-α-1,3,5-GeW9O36 and A-α-2,3,4-GeW9O36) segments have been first discovered in POM chemistry, and four [GeW9O36]14 segments are alternately connected by two Ti2O and two Ti4O4 cores to form a ring-shaped poly(POM), in which two types of linking modes, Ti2O and Ti4O4 bridging cores, are observed for the first time in POMs. The transformation of achiral precursors into chiral POM segments is of great significance for the POM synthetic chemistry. Furthermore, 1 as a heterogeneous catalyst can effectively catalyze the oxidation of various thioethers and mustard gas simulant 2-chloroethyl ethyl sulfide (CEES).
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC, 21831001, 21571016, 91122028) and the NSFC for Distinguished Young Scholars (20725101).
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Li, HL., Lian, C. & Yang, GY. A ring-shaped 12-Ti-substituted poly(polyoxometalate): synthesis, structure, and catalytic properties. Sci. China Chem. 65, 892–897 (2022). https://doi.org/10.1007/s11426-022-1215-1
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DOI: https://doi.org/10.1007/s11426-022-1215-1