{Ta12}/{Ta16} Cluster-Containing Polytantalotungstates with Remarkable Photocatalytic H2 Evolution Activity
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https://figshare.com/articles/dataset/_Ta_sub_12_sub_Ta_sub_16_sub_Cluster_Containing_Polytantalotungstates_with_Remarkable_Photocatalytic_H_sub_2_sub_Evolution_Activity/2463880
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Four novel polytantalotungstates K5Na4[P2W15O59(TaO2)3]·17H2O (1), K8Na8H4[P8W60Ta12(H2O)4(OH)8O236]·42H2O (2), Cs3K3.5H0.5[SiW9(TaO2)3O37]·9H2O (3), and Cs10.5K4H5.5[Ta4O6(SiW9Ta3O40)4]·30H2O (4) were synthesized. Compounds 1 and 3 are tris-(peroxotantalum)-substituted Dawson- and Keggin-type derivatives, whereas 2 and 4 are tetrameric oligomers containing respectively an unprecedented {Ta12} and {Ta16} cluster core. The photocatalytic activities of 2 and 4 for H2 evolution from water were evaluated. The significantly enhanced performance against the control K6[P2W18O62] can be attributed to the modulation of the electronic structures of these novel POMs by Ta incorporation. The highest activity observed so far with the use of 2 can be further rationalized by the presence of distorted heptacoordinate Ta atoms in the form of TaO7 pentagonal bipyramid.
创建时间：
2016-02-20
