Different types of polyoxometalate-directed diverse architectures derived from the rigid ligand pyrazine-bis(triazole): assembly, electrocatalysis, and dye adsorption

摘要

Three new polyoxometalate (POM)-based metal-organic complexes, {Ni-3(Hpytty)(2)[AlMo6(OH)(5)O-19](H2O)(4)(CH3O)}center dot 5H(2)O (1), {Ni-3(Hpytty)(2) [CrMo6(OH)(5)O-19](H2O)(10)}center dot 6H(2)O (2), and {Co-2(pytty)[gamma-Mo8O26](0.5) (H2O)(5)}center dot 4H(2)O (3) (H(2)pytty = 3-(pyrazine-2-yl)-5-(1H-1,2,4-triazol-3-yl)-1,2,4-triazolyl), have been prepared by the solvothermal method. Complexes 1 and 2 show similar 0-D structures containing a [Ni-3(Hpytty)(2)](4+) and Anderson-type [AlMo6(OH)(5)O-19](4-) /[CrMo6(OH)(5)O-19](4-) anions. The [gamma-Mo8O26](4-) anion was generated in-situ from the [IMo6O24](5-) anion in 3, which shows a 3-D coordination structure constructed from 2-D Co-pytty metal-organic layers and gamma-Mo-8 anions. The results reveal that the POMs play key roles in tuning the diverse architectures of the final complexes. For 1-3, their adsorption properties for MB/GV and their electrochemical activities have been investigated.