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Multinuclear NMR study of lanthanide(III) complexes of 1,2‐PDTA in aqueous solution
Author(s) -
Song RuiFang,
Zhang CunZhi,
Li Fei,
Hua ShiYing
Publication year - 1993
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19930110109
Subject(s) - chemistry , lanthanide , aqueous solution , ligand (biochemistry) , coordination sphere , chloride , ion , proton nmr , nuclear magnetic resonance spectroscopy , crystallography , inorganic chemistry , stereochemistry , organic chemistry , receptor , biochemistry
Abstract The complexation of lanthanide(III) cations with 1,2‐propanediaminetetraacetate (1,2‐PDTA) in aqueous solution has been investigated by 10 Na, 35 Cl, 2 H and 11 O NMR shift measurements. It has been shown that the contact shifts are dominant for 17 O, 16 Cl and 2 H (only for the heavier lanthanide series) and the pseudocontact shifts are dominant for 25 Na. It is suggested that the 1,2‐PDTA ligand is bound pentadentately via the two nitrogens and the three carboxylates for the lighter lanthanide complexes, hexdentately via the two nitrogens and the four carboxylates for the heavier ones. The numbers of the water coordinated were determined. The small amount of chloride anion in inner coordination sphere was observed.