A new strategy for the synthesis of macrocycle linkers in metal organic frame workscompounds

Now adays, one of the greatest challenges in synthesizing metal-organic frameworks (MOFs) is the lackof a linker and its accompanying metals [۱,۲]. To overcome this challenge, researchers have used from functionalligands (custom-designed organic ligands) and functionalization of the organic ligands with side groups including−NH۲, −COOH, and −CONH, which lead to MOFs materials possessing wonderful properties [۳]. In this research,we designed an azamacrocyclic tetraimidazolat ligand ۱,۴,۷,۱۰‑tetraazadodecine N,N′,N″,N‴-tetrabenzimidazole (TACTBI) through an eco-friendly condensation methods. In the next step, a new microporousMOFs was prepared with triggered self‐assembly TACTBI ligand with Ni (II) cations under solvothermalconditions. Various studies (surface analysis and chemical identification methods (viz. SEM, EDX, etc.)) haveshown, that the metal bond formed between TACTBI ligand with an imidazolate group and metal junction, whichcan 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 variouselectrochemical methods. The measurement based on the behaviour of the anodic peak of Ni-MMOFs due toformation of stable complex between Ni (II)/ Ni (III) in organic framework and CN−, when the potential is directedin the positive direction. The method was applied satisfactorily for analysis of CN− in environmental naturalwater samples. The results show that, the proposed sensor exhibited wide linear range, low LOD value and goodselectivity.

کلیدواژه ها:

synthesis ، macrocycle ، metal organic frame works