
TY  - JOUR
A1  - Boreham, CJ 
A1  - Buckingham, DA 
T1  - Oxygen exchange and glycinate ring opening in [Co(en)<sub>2</sub>(gly)]<sup>2+</sup>
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1980
VL  - 33
IS  - 1
SP  - 27
EP  - 35
KW  - 
UR  - https://doi.org/10.1071/CH9800027 
N2  - Over the pH range 0-2 chelated glycine in [Co(en)2(gly)2+ exchanges one of its oxygens according to the rate law kobs = k(1),[H+] with k(1), (1.0+0.1) &#215; 10-5 mol-1 dm3 s-1. The second oxygen exchanges much more slowly with k(2) c. 7 &#215; 10-8 s-1 in 0.1 mol dm-3 acid. In alkaline solution, [OH-] being 1.0-10-3 mol dm-3, the two oxygen atoms exchange according to the expression kobs = k(1),(2)[OH-] with k(1) 3.0 &#215; 10-3mol-1 dm3 s-1 and k(2) c. 1.7 &#215; 10-6 mol-1 dm3 s-1 both at 25.0&#176;C and ionic strength, &#956; 1.0 (NaClO4). The latter process occurs with C-O bond fission to form cis-[Co(en)2(gly)(OH)]+, with kd 1.8 &#215; 10-5 mol-1 dm3 s-1, which subsequently undergoes a more rapid OH--catalysed loss of glycine, with k'd, 6 &#215; 10-4 mol-1 dm3 s-1, to form cobalt(III) and cobalt(II) products. 
ER  -

