Exploitation of a Zn(II) paddle wheel metal-organic framework as effective sorbent for the quantitative estimation of cationic and anionic dyes

Abstract A Zn(II) bearing two-dimensional (2D) metal–organic framework (MOF) of [Zn2(muco)2(4-nvp)2]·CH3OH (1) has been prepared at room temperature by slow diffusion method. The prepared MOF has been structurally characterized by single crystal X-ray diffraction (SCXRD) technique. The compound 1 constructs a three-dimensional (3D) supramolecular network by the combination of hydrogen bonding and π···π interactions. Hirshfeld surface analysis has also been carried out to investigate the impact of non-covalent interactions in crystal packing. Furthermore, the synthesized compound 1 has been exploited as effective sorbent for the spectrophotometric estimation of cationic and anionic dyes namely, Rhodamin–B (RDB), Rose Bengal (RB) and Eosine-Y (EY). The maximum absorbances (λ max) of the compound 1 with above dyes were measured at 553 nm, 550 nm and 516 nm respectively. The dye RDB follows Beer-Lambert law in the concentration range of 1.0–6.0 μg/mL with correlation coefficient of 0.980; RB follows in the concentration range of 2.4 × 10−4–1.21 × 10−3 μg/mL with correlation coefficient of 0.999 and EY follows in the concentration range of 0.4–3.0 μg/mL with correaltion coefficient of 0.999. After sorption of dyes, MOF 1 shows a drastic change in its emax value. The developed method has the potential to be applied for quantitative estimation of the dyes in the real sample analysis.