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Complexation of lanthanide(III) ions with a β‐diphosphorylated ligand: Nonamethylimidodiphosphoramide (NIPA). A 1 H and 31 P NMR study
Author(s) -
Rubini P.,
Nasr C. Ben,
Rodehüser L.,
Delpuech J.J.
Publication year - 1987
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260250712
Subject(s) - lanthanide , chemistry , isostructural , paramagnetism , denticity , ligand (biochemistry) , crystallography , ion , chelation , stoichiometry , molecule , nmr spectra database , inorganic chemistry , spectral line , crystal structure , organic chemistry , biochemistry , physics , receptor , quantum mechanics , astronomy
Trivalent lanthanide ions form complexes of different stoichiometries with the bidentate ligand nonamethyl‐imidodiphosphoramide (NIPA). Depending on the method of preparation, compounds with two or three NIPA molecules may be obtained, which can be distinguished and characterized on the basis of their NMR spectra. The method of preparation for the tris‐chelates and an analysis of the isotropic paramagnetic shifts for these compounds are reported; the results allow the conclusion that the complexes in solution are isostructural along the lanthanide series. The same conclusion is drawn for the bis‐chelates. In both cases the contact and pseudo‐contact contributions to 31 P shifts are important, whereas for the 1 H nuclei the dipolar contribution is largely predominant.