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

摘要

Three novel helical compounds, [Ag3(H2O)2(btpe)2](HMo8 O_(26))·2H2O(1), [Cu3(btpe)4(ac)2](Mo8O_(26))(2), and [Co(btpe)2]2(Mo8 O_(26))(3) (btpe=1,5-bis(1,2,4-triazol-1-yl)pentane and ac=ace- tate) have been synthesized under the same hydrothermal con- ditions. Structural characterizations by single-crystal X-ray dif- fraction show that compounds 1 and 2 possess a pair of the right- and left-handed double helixes with communal entangle- ment 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 com- pounds present a good degradation activity and may be po- tential photocatalysts to decompose the Methylene Blue dye.