Synthesis and structural characterization of new group 12 metal ions coordination polymers built on sulfur‐based ligand and probing their high iodine adsorption efficiency in micro and bulk forms

• Published in: Applied organometallic chemistry 2023-02, Vol.37 (2), p.n/a
• Main Authors: Bahrani‐Pour, Maryam, Beheshti, Azizolla, Naseri, Nadieh, Maleki, Qasem, Mayer, Peter, Abrahams, Carmel T., Centore, Roberto
• Format: Article
• Language: English
• Subjects: Adsorption; Chemistry; Coordination polymers; Cyclohexane; group 12 complexes; Imidazoline; Iodine; iodine uptake; kinetic studies; Ligands; Metals; methimazole‐based ligands; Polymers; Structural analysis; Sulfur; sulfur coordination polymers; Transition metals; Zinc
• ISSN: 0268-2605; 1099-0739
• DOI: 10.1002/aoc.6977

In this work, we have prepared two new sulfur CPs with group 12 transition metals, namely, [Zn (NCS)Cl(μ2‐L)]n (1) and [Hg (SCN)2(μ2‐L)]n (3). [Cd (NCS)Cl(μ2‐L)]n (2), which is isostructural with 1, was synthesized for a comparison from our published work. These compounds have been characterized by FT‐IR, UV–Vis, powder X‐ray diffraction (PXRD), elemental analysis (CHNS), scanning electron microscopy (Fe‐SEM), TGA, BET, and single‐crystal X‐ray analysis for 1 and 3. In the structure of all polymers, the bbit ligand [L = bbit = 1,1‐bis(3‐methyl‐4‐imidazoline‐2‐thion)butane] is bridged between metal centers by the anti‐anti‐anti conformation to form an infinite 1D zigzag chain. The considered polymers were used for the removal of a substantial amount of I2 from cyclohexane solution. Despite the nonporous and low dimensional frameworks of title polymers, their maximum iodine adsorption capacities were notable and in order of 817.68, 906.48, and 911.08 mg/g for polymers 1–3, respectively, with an extraordinary stability toward iodine. The capacity of micro‐sized structures was almost double as compared with their bulk ones. Three group 12 sulfur coordination polymers were used for reversible removal of iodine from solution. Interestingly, these nonporous low dimensional polymers in their micro and bulk forms showed a high capacity of iodine removal, in order of 817.68, 906.48, and 911.08 mg/g for Zn, Cd, and Hg polymers, respectively, with remarkable stability and recyclability toward the capture of I2. The capacity in micro‐sized morphology was almost double as compared with the bulk form.