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

Abstract

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.

Conjugated Microporous Polymers Based on Octet and Tetratopic Linkers for Efficient Iodine Capture

“…As a green and sustainable energy source, nuclear fusion is regarded as a new energy source necessary to solve the problems of human survival and development. However, due to the adverse effects of the use of nuclear power, radioactive contamination can cause genetic variation in organisms and offspring . As a ubiquitous radioactive pollutant in nuclear plants, iodine, especially 129 I and 131 I, poses a great threat to the ecological environment …”

“…However, due to the adverse effects of the use of nuclear power, radioactive contamination can cause genetic variation in organisms and offspring. 2 As a ubiquitous radioactive pollutant in nuclear plants, iodine, especially 129 I and 131 I, poses a great threat to the ecological environment. 3 129 I and 131 I are highly mobile gases at high temperatures, and 129 I has a long half-life of 15.7 million years.…”

Nanoarchitectured Graphene Organic Frameworks with High Iodine Uptake and Antibacterial Activity

“…I 3 − is an ionic compound that does not dissolve in cyclohexane (a nonpolar solvent) and was only formed during the release process in ethanol, as shown in eqs 11 and 12. 44 Consequently, the larger amount of adsorbed iodine by the adsorbent's sites is released, making the adsorption sites available for iodine once again. Not surprisingly, the adsorption performance of GOF-L S has not significantly changed owing to the reaccessibility of the adsorption sites especially of sulfur atoms (Figure S9).…”

Important Counteranion Effect on Adsorption Efficacity of Hydrogen Sulfide by Silver(I)-Dithione Coordination Polymers

“…The dithione ligands are capable to generate coordination networks with coinage metal salts such as silver­(I) and gold­(I), but also with other metal ions, such as cadmium­(II) and mercury­(II), which have demonstrated the ability to capture organic pollutants, inorganic toxins, including iodine and heavy metals. − In these cases, the counteranion can be halides, pseudohalides, trifluoroacetate, perchlorate, dichromate, nitrate, or a mixture of these anions. Recently, the R­(CS)–(CH 2 ) m –(SC)­R ligands ( m = 2, 5) has been used to construct various coordination networks, which demonstrated the capacity to selectively capture and separate gases. , The general conclusion resulting from these investigations, and therefore the intrinsic characteristics of these coordination networks, are inherently a function of the metal ion and its corresponding counteranion, as well as the number of methylene groups within the chain, m. However, the list of coordination networks investigated so far appears to be rather heterogeneous comparative to the rather rich thioether counter-parts. , This paucity precludes reliably establishing structure–property trends, and thus the reasons rationalizing the experimental outcomes.…”