
%0 Journal Article
%A Lim, M 
%T Copper(II) complexes of 3,3'-[Ethane-1,2-diylbis(imino)]bis(propanamide) in solution
%J Australian Journal of Chemistry
%D 1982/03/01
%V 35
%N 3
%P 483-488
%K 
%R https://doi.org/10.1071/CH9820483
%U https://www.publish.csiro.au/paper/CH9820483 
%X The interaction of copper(II) ions with 3,3'-[ethane-1,2-diylbis(imino)]bis(propanamide) (H2eip) in 0.1 mol l-l KNO3 at 25ºC has been studied by means of spectrophotometry and potentiometry. The acid dissociation constants of the ligand have also been determined under the same conditions. Equilibria (1) and (2) apply to the free ligand:  (H2eip)H22+KA&#8596;(H2eip)H++H+(1) (H2eip)H22+KA&#8596;(H2eip)H+ (2) For the copper complexes, equilibria (3)-(5) were found to hold:  Cu2+H2eip&#8596;Cu(H2eip)2+ (3) Cu(H2eip)2+&#8596;Cu(H2eip)++H+ (4) Cu(Heip)+&#8596;Cu(eip)+H+ (5) The values of the equilibrium constants are: pKA 5.79, pKB 8.88, log K 11.89, pK'1 8.06, pK'2 9.48. The absorption maxima and the extinction coefficients of Cu(H2eip2+ and Cu(eip) are, respectively, &#947;max654 nm, &#949;max138 cm-1 mol-1 1 and &#947;max 543 nm, &#949;max 98.6 cm-1 mol-1 l. 
