Proton conductivity resulting from different triazole-based ligands in two new bifunctional decavanadates

Triazole, similarly to imidazole, makes a prominent contribution to the proton conductivity of porous materials. To investigate the effects of triazole-based ligands in polyoxovanadates (POVs) on proton conduction, we designed and synthesized two decavanadate-based POVs, [Zn(3)(C(2)H(4)N(4))(6)(H(2)O)(6)](V(10)O(28))·14H(2)O (1) and [Zn(3)(C(2)H(3)N(3))(8)(H(2)O)(4)](V(10)O(28))·8H(2)O (2) constructed from the ligands 3-amino-1,2,4-triazole and 1H-1,2,4-triazole, respectively, via an aqueous solution evaporation method. Surprisingly, complex 1 obtained a superior proton conductivity of 1.24 × 10(−2) S cm(−1) under 60 °C and 98% RH, which is much higher than that of complex 2. Furthermore, due to the contribution of the conjugate properties of the ligands to the third-order nonlinear optical (NLO) properties, we also studied its two-photon responses and achieved satisfactory results.