Structural transformation of copper coordination complexes accompanied with chiral transformation

Abstract

Four copper coordination complexes [CuL(CH3OH)]n (1), [CuL(C2H5OH)]n (2), [(CuL)·0.5H2O]n (3), and [CuL(H2O)·0.5H2O]n (4) with a tridentated Schiff base ligand (H2L = (E)-2-((4-fluoro-2-hydroxybenzylidene)amino)acetate) were obtained in different solvents and reaction times....

Preferential Enrichment of Enantiomer from Amino Acid Schiff Bases by Coordination Interaction and Crystallization

“…In this work, the ligand (S, E)-2-((4-chloro-2-hydroxybenzylidene) amino) propanoate, NaHL ) previously reported by our group [ 22 , 23 , 24 ] was studied in coordination with Cu(I) and Cu(II) ions by tuning the pH, the solvent and the second ligands. Three pairs of enantiomers of coordination complexes were obtained based on the PE principle, the different PE phenomena of complexes were observed during crystallization.…”

Zinc(ii) Schiff base complexes as dual probes for the detection of NH4+ and HPO42− ions

“…To the best of our knowledge the detection of NH 4 + and HPO 4 2À ions using a Schiff base fluorescence sensor is rarely reported. Based on our previous work,[40][41][42][43] in this paper, three novel Zn(II) Schiff base complexes were synthesized by solvent evaporation at room temperature using 4-substituted salicylic aldehyde derivatives NaHL (NaHL = sodium (S,E)-2-((4-chloro-2-hydroxybenzylidene) amino) propanoate) and zinc acetate. The coordination mode of [Zn(L) (H 2 O)] n (1) and [Zn(L) (H 2 O)] n (2) was basically the same, and [Zn 2 (L) 2 (bipy)] (3) was constructed as a quad-nuclear structural unit due to the introduction of the second ligand 4,4 0 -dipyridine connection.…”