Study of protonation and Zn(II), Cd(II), Cu(II) and Mn(II) complexation with a glutamic acid N-pyrimidine derivative: Crystal structure of a neutral Cd(II) complex of the bianionic ligand

Abstract

The compound N-(4-amino-1-methyl-5-nitroso-6-oxo-1,6-dihydropyrimidin-2-yl)-(s)-glutamic acid (H 3 L) was synthesised and structurally characterised by analytical methods and

Preparation and characterization of trihydroxamic acid functionalized carbon materials for the removal of Cu(II) ions from aqueous solution

“…2c). These changes are similar to those reported for analogous 5-nitroso pyrimidine receptors [25,26,38,48]. Thus, this protonation is assigned to the C(5)NO chromophore of the pyrimidine moiety.…”

“…2d). These features are similar to the deprotonations of analogous pyrimidine-receptors and therefore they are assigned to the C(2) pyr -NH C(2) pyr -N − + H + process [25,26,38,48].…”

Binding and Removal of Sulfate, Phosphate, Arsenate, Tetrachloromercurate, and Chromate in Aqueous Solution by Means of an Activated Carbon Functionalized with a Pyrimidine-Based Anion Receptor (HL). Crystal Structures of [H3L(HgCl4)]·H2O and [H3L(HgBr4)]·H2O Showing Anion−π Interactions

“…In previous works, it was evidenced that the aromatic residues of HL, as well as those of previously studied HL analogues, ,, exhibit bipolar character with positive and negative charges located, respectively, at the ring and at the NO group attached to C(5′) of the pyrimidine ring. This suggests that in the anion complexes formed by H 2 L + and H 3 L 2+ , the ligand might use two different coordination environments to host the anions, the polyammonium moiety, where electrostatic and hydrogen bond interactions are operating, and the pyrimidine ring which may act via anion−π interaction.…”

Anion-Dependent Crystallization of Four Supramolecular Cadmium Complexes: Structures and Property Studies

“…The fact that cadmium(II) can readily vary its coordination number from 4 to 8 by merely changing the size or concentration in solution of a ligating species makes it an appealing candidate for use in deliberately designed or “tailored” polymeric coordination complexes. We focused our work on the Cd(II) and H 4 mbna system, with the variety anions of SO 4 2− , NO 3 − , and Cl − . Herein, we will report four anion dependent supramolecular cadmium complexes, [Cd(phen) 2 (H 2 O) 2 ] (H 2 mbna)·(H 2 O) ( 1 ), {[Cd 4 (H 2 mbna) 8/2 (phen) 4 ]·2DMF} n ( 2 ), [Cd(H 2 mbna)(bipy)(H 2 O)] n ( 3 ), and (Δ,Δ)-[Cd(H 2 mbna)(bipy) 2 ] n ( 4 ) in the presence of the auxiliary ligands of 1,10-phenanthroline and 2,2′-bipyridine.…”