Journal of the Chemical Society, Dalton Transactions p. 207 - 211 (1990)
Update date:2022-08-11
Topics:
Barbucci, Rolando
Casolaro, Mario
Fini, Adamo
The thermodynamic function (ΔG0, ΔH0 and ΔS0) for the protonation of α-aminomalonic acid were determined in aqueous solution (25 deg C, I=0.1 mol dm-3 NaCl).The basicity constants and enthalpy changes were evaluated from potentiometric and calorimetric data for both the primary amino and the carboxylate groups.On the basis of the thermodynamic changes a closed structure is hypothesized with the protonated amino nitrogen hydrogen-bonded to both the carboxylate groups to form two five-membered rings.The protonation of the CO2- groups provokes opening of the ring s.A relatively high stability constant for complexation with Cu2+ was determined, however in a narrow range of low pH.The co-ordination to the copper(II) occurs both with nitrogen and the two oxygen donor atoms, to form two five-membered chelate rings.
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