A mononuclear copper(II) complex of an unsymmetrical dinucleating ligand

Abstract

The unsymmetrical and potentially dinucleating ligand 4-bromo-2-(2hydroxyethyliminomethyl) -6-(morpholin-4-ylmethy1)phenol ( H,L1) has been prepared via a Mannich reaction under non-aqueous aprotic conditions. Reaction with copper( 11) yielded mono-and di-nuclear complexes; the crystal structure of the mononuclear complex [Cu( H,L')] [CIO,],-H,O*MeOH has been determined.

Anion Selectivity in Zwitterionic Amide‐Functionalised Metal Salt Extractants

“…The secondary amines 1-3, which are precursors for L n (n = 1-3), respectively, were obtained by mono-derivatisation of the appropriate diamine with benzoic anhydride by using a modification of a literature method (Scheme 2), [30] followed by reaction with benzaldehyde and reduction with NaBH 4 . Compounds 1-3 were then treated with paraformaldehyde and 2-hydroxy-5-tert-butylbenzaldehyde in a two-step Mannich reaction [31] to give the corresponding salicylaldehydes in typically 30-40 % yields. Initially a conventional Mannich reaction [31] between 5-tert-butyl-2-hydroxybenzaldehyde [32] and 1-acetylpiperazine was used to generate the aldehyde 4 in 69 % yield as a precursor for Figure 1.…”

“…Compounds 1-3 were then treated with paraformaldehyde and 2-hydroxy-5-tert-butylbenzaldehyde in a two-step Mannich reaction [31] to give the corresponding salicylaldehydes in typically 30-40 % yields. Initially a conventional Mannich reaction [31] between 5-tert-butyl-2-hydroxybenzaldehyde [32] and 1-acetylpiperazine was used to generate the aldehyde 4 in 69 % yield as a precursor for Figure 1. Recovery of a base metal by selective transport of a metal salt from a pregnant leach solution containing a complex mixture of cations and anions Scheme 1.…”

Crystal structure of diaqua-bis((E)-4-hydroxy-3-((2-hydroxyethylimino)- methyl)-5-(morpholinomethyl)benzenesulfonato)dicopper(II) diperchlorate hexahydrate, [Cu2(H2O)2(C14H19N2O3SO3)2][ClO4]2 · 6H2O

“…The bond lengths Cu1-O4, Cu1-N1, Cu1-O7a nd Cu1-O5a re 1.878(3) Å,1.933(4) Å,1.980(3) Åand 2.007(3) Å,respectively. Int he ClO 4 -anion, the refined distances Cl1-O8, Cl1-O10, Cl1-O9and Cl1-O11 are 1.309(8) Å,1.319(9) Å,1.386(7) Å and 1.428(10) Å,respectively. There are weak and strong hydrogen bonds in the complex.…”

“…The crystal structure of the title compound consists of three fundamental units: metal complex cations, ClO 4 -anions and lattice water. Inthe complex, the hydrogen atom from phenol hydroxyl moved on to the nitrogeninthe morpholine.…”

“…After stirring vigorously for 30 min, 10 mmol Cu(ClO 4 ) 2 ·6H 2 Owas addedtothe resulting Schiff base. The mixture was refluxed for 1hand cooled to room temperature.Atfirst green square plate-shapedcrystals were isolatedf rom the precipitate, and then green needle-like crystals were obtained after aweek by slowly evaporation of the solution at room temperature [1][2][3][4]. …”