Synthesis of Three Novel Polyoxometalate-based Helical Hybrids from Simple to Complicated Helixes via Turing Metal Salt

摘要

Three novel helical compounds, Ag-3(H2O)(2)(btpe)(2)(HMo8 O-26)center dot 2H(2)O (1), Cu-3(btpe)(4)(ac)(2)(Mo8O26) (2), and Co(btpe)(2)(2)(Mo-8 O-26) (3) (btpe=1,5/bis(1,2,4-triazol-1-yl) pentane and ac=acetate) have been synthesized under the same hydrothermal conditions. Structural characterizations by single-crystal X-ray diffraction show that compounds 1 and 2 possess a pair of the right-and left-handed double helixes with communal entanglement nodes, whereas compound 3 represents the first example of POM-based double helical compound that consists of three pair of the right-and left-handed double helixes, containing two pairs of the right-and left-handed double helixes with communal entanglement nodes and a pair of the right-and left-handed double helixes without entanglement nodes. Also, the photocatalytic experiment indicates that the title compounds present a good degradation activity and may be potential photocatalysts to decompose the Methylene Blue dye.