Design and Synthesis of Polymer-Bound Penta-aza Ligand for Selective Adsorptive Separation of Cobalt(II) from Zirconium(IV)

Abstract

A penta-aza ligand was designed using the Density Functional Theory (DFT), synthesized, and then loaded on a polystyrene matrix to prepare a functional polymer as a Co(II) selective adsorbent. A comparative experimental study on adsorption of Co(II) and Zr(IV) revealed that the polymer-supported ligand is more selective toward Co(II) than Zr(IV) from aqueous acidic solutions. The maximum adsorption capacities of the adsorbent for Co(II) and Zr(IV) were 4.1 and 0.5 mg/g, respectively, at pH 1.0. Vibrational frequencies of the metalÀligand complexes were calculated with the VWN-BP functional to confirm true local minima.

Piperazine-Containing Polymer Brush Layer as Supported Base Catalyst in a Glass Microreactor

“…General scheme for anchoring of the initiator, ATRP of glycidyl methacrylate, and ring opening of epoxide with (1-boc-)piperazine (3) Under similar reaction conditions, a microreactor containing PGMA polymer brushes in the absence of piperazine showed no detectable conversion, proving that piperazine is the catalytically active species. To study the possible influence of the OH groups in the piperazine-containing polymer brushes on the catalytic activity of the system, they were protected as tetrahydropyranyl (THP) ethers [30]. The choice of THP as the protecting group is because of its remarkable stability under (strongly) basic conditions [31].…”

Structural and spectroscopic characterization and DFT studies of 2-amino-1,10-phenanthrolin-1-ium chloride

“…We have an ongoing interest in the synthesis of azabridged bis-1,10-phenanthroline derivatives [10][11][12], mainly due to their significant biological activity of the corresponding metal complexes in which the planar and also rigid structure of 1,10-phenanthroline (phen) can either intercalate or bind to the grooves of DNA or RNA [13][14][15][16][17][18][19][20]. Therefore, the design and synthesis of new derivatives of phen with extended properties have gained a significant attention by many researchers [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. We have previously reported an alternative strategy to synthesize a series of phen derivatives [37].…”

The role of polarizability in determining metal ion affinities in polymer-supported reagents: monoprotic phosphates and the effect of hydrogen bonding

“…6 An amine-modified silica was developed as a selective adsorbent for Cr(VI) from aqueous solutions 7 and immobilized salicylideneimine was found to be selective for uranium from a synthetic nuclear industrial effluent. 8 Selectivity can be incorporated into polymeric reagents with ligands analogous to soluble complexants such as Schiff bases, 9 N,N-bis-[1,10-phenanthrolin-2yl]-amine, 10 and imidazole, 11 as well as through the use of amino acids such as cysteine. 12 While this empirical design of ligands can be successful, rational design is an important alternative and polarizability, described by hard-soft acid-base theory, 13 is a useful variable in building an a priori understanding of ion -ligand selectivity for applications to sensors, SPE, remediation, etc., by matching the polarizability of a targeted metal ion to a given ligand.…”