Add time:08/31/2019         Source:sciencedirect.com

Reaction of 2,2′-diphthalimidodiethylamine with 2-vinylpyridine in H2O/MeOH and deprotection with HCl(aq) does not give the anticipated tripodal ligand N-2-(2-pyridylethyl)-N,N-bis(2-aminoethyl)amine. Instead, the new linear tetradentate tetraamine ligand N-{2-[(2-pyridin-2-ylethyl)amino]ethyl}ethane-1,2-diamine (peda) is formed. The synthesis and characterisation of the Co(III) complexes [Co(peda)O2CO]X · H2O (X = ClO4, I), trans-[Co(peda)Cl2]ClO4 and trans-[Co(peda)Br2]Br is reported, and an X-ray crystal structure of [Co(peda)O2CO]I · H2O shows the presence of the fms isomer only. Rate data for the acid hydrolysis of [Co(peda)O2CO]ClO4 · H2O over the [H3O+] range 0.2–1.0 M (I = 1.0, NaClO4) are reported. Strict first-order kinetics are observed and the data are consistent with the currently accepted mechanism for the hydrolysis of bidentate carbonate complexes.

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