Tetrazole Based Porous Metal Organic Framework (MOF): Topological Analysis and Dye Adsorption Properties

Abstract

A tetrazole based metal organic framework [Cu(Metet)]n (MOF-1) (MetetH = 5-methyl-1H-tetrazole) has been prepared under solvothermal condition using sodium azide and nitrile in presence of CuCl2·2H2O. The crystalline product thus obtained was characterized by spectral (FTIR, UV–visible and fluorescence) and single crystal X-ray diffraction analysis. Tetrazole ligand is formed in situ by the reaction of azide and nitrile used. X-ray data confirm the tetrahedral geometry around the Cu(II) ion where all the four coordination sites are provided by four N of the four different ligand (Metet). MOF-1 has trigonal crystal system with R-3 m space group. Topological analysis of MOF-1 shows 4,4-c binodal net with uncommon ptr topology and stoichiometry, (4-c)(4-c). The detailed structural analysis reveals the porous nature of the MOF with channel of dimensions, Rf = 0.6 A and Rfi = 2 A. Further, the present MOF shows excellent adsorption properties towards organic dye, Methylene blue (MB) and thus can be employed as a good adsorbent for organic pollutants to remove MB from waste water. The possible rationale behind the dye adsorption is the porous nature of the MOF-1.