Carbon-13 nuclear magnetic resonance study of propane-1,3-diamine-NNN′N′-tetra-acetate ion and its diamagnetic metal complexes
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 15,p. 1445-1448
- https://doi.org/10.1039/dt9760001445
Abstract
Diamagnetic metal complexes of propane-1,3-diamine-NNN′N′-tetra-acetate ion (pdta4–) have been studied by 13C n.m.r. spectroscopy. The results confirm previous studies in showing that complexes in which the ligand is quinquedentate are not formed (except possibly with HgII), but also show that this is due not to decreased ring strain in the six-co-ordinate complexes but rather to steric compression of the glycinate chelate arms arising from the bunched backbone methylene groups. At low pH the complex formed between pdta4– and AlIII is more inert than the analogous ethylenediamine-NNN′N′-tetra-acetate (edta4–) complex despite the lower equilibrium formation constant, and this is in line with the reduced tendency of pdta4– to form complexes in which the ligand is quinquedentate.Keywords
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