Mixed-ligand complexes of palladium(II). Part 2. Diaqua(ethylenediamine) palladium(II) complexes of L-asparagine and L-glutamine
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 14,p. 1398-1400
- https://doi.org/10.1039/dt9770001398
Abstract
The reactions of [Pd(en)(OH2)2]2+(en = ethylenediamine) with L-asparagine monohydrate and L-glutamine in 0.5 mol dm–3 K[NO3] have been studied by potentiometric titrations. The results obtained can be explained by equilibria (i) and (ii) where L–= H2NCOCH2CH(NH2)CO2 – or H2NCOCH2CH2CH(NH2)CO2 –, and log K1 and [Pd(en)(OH)2]2++ L–[graphic omitted][Pd(en)L]+(i), [Pd(en)L]+[graphic omitted][Pd(en)L′]+ H+(ii) pKa′ are 10.46 and 6.46 for asparagine and 10.76 and 9.03 for glutamine respectively. The mode of co-ordination of the two ligands in their protonated and deprotonated complexes is discussed on the basis of these parameters.Keywords
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