Proton conductivity resulting from different triazole-based ligands in two new bifunctional decavanadatesElectronic supplementary information (ESI) available. CCDC 1820884 and 1820885. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c8ra02694g

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 1 H -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. To investigate the effects of triazole-based ligands in polyoxovanadates (POVs) on proton conductivity, we designed and synthesized two decavanadate-based POVs.