
TY  - JOUR
A1  - Graham, PG 
A1  - Weatherburn, DC 
T1  - Dissociation kinetics of metal complexes in aqueous acid. III. The effects of methyl substitution and chelate ring size on the rates of dissociation of copper(II) triazamacrocyclic complexes
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1984
VL  - 37
IS  - 11
SP  - 2243
EP  - 2247
KW  - 
UR  - https://doi.org/10.1071/CH9842243 
N2  - The acid dissociation kinetics of mono copper(II) complexes of the ligands 2-methyl-1,4,7-triazacyclononane, mznn ; 1,4,7-triazacycloundecane, zaud ; 1,4,7-triazacyclododecane, zadd ; and 1,5,9-triazacyclotetradecane, zted were studied in aqueous solution over a range of acid concentra- tions (0.025-0.5 mol 1-1), I1.0 (NaN03). Cu(mznn)2+ displays a first-order dependence on [H+] with kH (298 K) 26 1. mol-1 s-1. The other complexes show an acid dependence at low [H+] but become independent of acid at higher concentrations. The acid-independent rate constants k1 were determined to be Cu(zaud)2+, 67 s-1 (280 K); Cu(zadd)2+, 45 s-1 (298 K); Cu(zted)2+ 50 s-1 (298 K). The results are compared with those obtained with other copper(II) triazamacro- cyclic complexes. 
ER  -

