Synthesis and Proton Conductivity of Two Molybdate Polymers Based on [Mo8O26]4− Anions

Abstract Two kinds of octamolybdate‐based Ni II ‐coordination polymers were synthesized by hydrothermal methods: H 2 [Ni(Mo 8 O 26 )(bimb) 3 ] ⋅ H 2 O and H 2 [Ni(Mo 8 O 26 )(bibp) 2 ] ⋅ 4H 2 O, (1, bimb)=1,4‐Bis(imidazole‐l‐ylmethyl)benzene), (2, bibp)=4,4′‐di(1H‐iMidazol‐1‐yl)‐1,1′‐biphenyl). The Single crystal X‐ray diffraction indicates that compounds 1 and 2 are the 2D layer based on γ ‐[Mo 8 O 26 ] 4− type and a 1D chain based on β ‐[Mo 8 O 26 ] 4− type polyoxomolybdate anions, respectively. At 85 °C and 98 % RH, the optimal conductivities of the two compounds are 1.03×10 −2 S cm −1 and 1.12×10 −2 S cm −1 , respectively. They exhibit good proton conductivity due to the rich imidazole units as carriers and continuous hydrogen bond networks as proton transport pathway. In this work, two molybdate‐based proton conducting materials are designed.