مشخصات پژوهش

Now adays, one of the greatest challenges in synthesizing metal-organic frameworks (MOFs) is the lack of a linker and its accompanying metals [1,2]. To overcome this challenge, researchers have used from functional ligands (custom-designed organic ligands) and functionalization of the organic ligands with side groups including −NH2, −COOH, and −CONH, which lead to MOFs materials possessing wonderful properties [3]. In this research, we designed an azamacrocyclic tetraimidazolat ligand 1,4,7,10‑tetraazadodecine N,N′,N″,N‴-tetra benzimidazole (TACTBI) through an eco-friendly condensation methods. In the next step, a new microporous MOFs was prepared with triggered self‐assembly TACTBI ligand with Ni (II) cations under solvothermal conditions. Various studies (surface analysis and chemical identification methods (viz. SEM, EDX, etc.)) have shown, that the metal bond formed between TACTBI ligand with an imidazolate group and metal junction, which can be act as electron transport channel and significantly increase charge transfer in various reactions. Therefore, for practical application of Ni-MMOFs, the surface of the glassy carbon electrode was covered by Ni-MMOFs as a suitable matrix for determining CN- in different environmental water samples with various electrochemical methods. The measurement based on the behaviour of the anodic peak of Ni-MMOFs due to formation of stable complex between Ni (II)/ Ni (III) in organic framework and CN−, when the potential is directed in the positive direction. The method was applied satisfactorily for analysis of CN− in environmental natural water samples. The results show that, the proposed sensor exhibited wide linear range, low LOD value and good selectivity.