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

Abstract

Three new polyoxometalate (POM)-based metal–organic complexes, {Ni₃(Hpytty)₂[AlMo₆(OH)₅O₁₉](H₂O)₄(CH₃O)}·5H₂O (1), {Ni₃(Hpytty)₂ [CrMo₆(OH)₅O₁₉](H₂O)₁₀}·6H₂O (2), and {Co₂(pytty)[γ-Mo₈O₂₆]_0.5 (H₂O)₅}·4H₂O (3) (H₂pytty = 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 [Ni₃(Hpytty)₂]⁴⁺ and Anderson-type [AlMo₆(OH)₅O₁₉]⁴⁻ /[CrMo₆(OH)₅O₁₉]⁴⁻ anions. The [γ-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 γ-Mo₈ 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.

Graphical Abstract

Keywords:

• Anderson-type polyoxometalate
• pyrazine-bis(triazole) ligand
• adsorption property
• electrocatalysis

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The supports of the National Natural Science Foundation of China (Nos. 21971024, 21671025, and 21501013) and Liao Ning Revitalization Talents Program (XLYC1902011) are gratefully acknowledged.