A 3D Coordination Network Built from Cu^II₄Cl₃(H₂O)₂ Linear Clusters and Tetrapyridyl Tetrahedral Silane Ligands: Reversible Iodine Uptake and Friedel–Crafts Alkylation Reactions

Abstract

A novel three-dimensional coordination network 1 in a new 4,5,6-connected topology (4,5,6T115) built from linear CuCl(HO) clusters and tetrahedral tetrakis(3-pyridyl)vinylsilane ligands is reported. Utilizing a similar tetrahedral ligand, tetrakis(3-pyridyl)ethylsilane, a different framework 2 having CuCl(HO) clusters is obtained in tcs topology. The activated sample of 1 shows an excellent and reversible uptake of I in solid as well as in solution phases owing to the presence of uncoordinated chloride ions and electron rich vinylic groups in it. The I uptake studies on the anion-exchanged samples, of bromide, iodide, and nitrate ions, show a progressive decrease in the adsorption capacity with the sample containing uncoordinated Cl ion showing a maximum uptake of 48.5% and the one with the NO ions exhibiting the lowest uptake of 24.0%. These observations suggest that the halide counterions interact better with I in comparison with nitrate ions and the better I uptake in the presence of Cl ions over the other two halides is due to its smaller size that offers a larger surface area for adsorption. Also, both these compounds were shown to be useful catalysts for the solvent-free syntheses of bis(indolyl)methanes via Friedel-Crafts alkylation reaction.

A multifunctional microporous metal–organic framework: efficient adsorption of iodine and column-chromatographic dye separation

“…Considering the microporous properties of JLNU-4, its capacity towards molecular iodine capture both in solvent and vapor phases was explored. When fresh samples of JLNU-4 (20 mg) were immersed in a hexane (3 mL) solution of iodine (4 mg mL À1 ), [31][32][33][34][35][36][37][38][39][40][41][42][43] the colour of the solution gradually faded from dark purple to light purple with the extension of time (Fig. 2a, top).…”

A Review on Metal- Organic Frameworks (MOFS), Synthesis, Activation, Characterisation, and Application

“…Several synthetic routes have been employed for the syntheses of varieties of rigid aryl systems based on silicon or boron centres with carboxylate or pyridyl pendants. 6,9,[240][241][242][243][244]17,21,199,[235][236][237][238][239]…”

ZIF-11 derived nanoporous carbons with ultrahigh uptakes for capture and reversible storage of volatile iodine

“…Regeneration of Z11-900 saturated with iodine molecules was conducted by using a solvent desorption technique [39]. The iodine-loaded Z11-900 was dispersed in methanol at room temperature.…”