TY - JOUR
T1 - Polarographic Oxidation of Diaminopyrimidines
AU - Cohen, D.
AU - Koenigsbuch, M.
AU - Sprecher, M.
PY - 1968
Y1 - 1968
N2 - The polarographic oxidation of 2, 5‐diaminopyrimidine (IV) and 4,5‐diaminopyrimidine (V) at the rotating Pt microelectrode in aqueous buffered solutions was studied. The effects of varying concentrations, temperature, pH, buffer concentration, rate of rotation of electrode and rate of scanning of potential were determined. The limiting currents are diffusion controlled and proportional to concentration up to 1 × 10−3 M for (IV) and 2 × 10−4 M for (V). The overall reaction is irreversible and probably involves two electrons per molecule to give an unstable product with a quinonimine structure. The dependence of E½ on pH in the anodic polarography of twelve more polyamino‐ and aminohydroxy‐pyrimidines was determined. Hückel type MO calculations were carried out for the pyrimidines and the energies calculated for the highest occupied MOs were correlated with E°½ values.
AB - The polarographic oxidation of 2, 5‐diaminopyrimidine (IV) and 4,5‐diaminopyrimidine (V) at the rotating Pt microelectrode in aqueous buffered solutions was studied. The effects of varying concentrations, temperature, pH, buffer concentration, rate of rotation of electrode and rate of scanning of potential were determined. The limiting currents are diffusion controlled and proportional to concentration up to 1 × 10−3 M for (IV) and 2 × 10−4 M for (V). The overall reaction is irreversible and probably involves two electrons per molecule to give an unstable product with a quinonimine structure. The dependence of E½ on pH in the anodic polarography of twelve more polyamino‐ and aminohydroxy‐pyrimidines was determined. Hückel type MO calculations were carried out for the pyrimidines and the energies calculated for the highest occupied MOs were correlated with E°½ values.
UR - http://www.scopus.com/inward/record.url?scp=84989996824&partnerID=8YFLogxK
U2 - 10.1002/ijch.196800079
DO - 10.1002/ijch.196800079
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AN - SCOPUS:84989996824
SN - 0021-2148
VL - 6
SP - 615
EP - 630
JO - Israel Journal of Chemistry
JF - Israel Journal of Chemistry
IS - 5
ER -