ISSN:
0749-1581
Keywords:
1H NMR
;
31P NMR
;
complexation
;
β-diphosphorylated ligand
;
lanthanide(III) ions
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
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 31P shifts are important, whereas for the 1H nuclei the dipolar contribution is largely predominant.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260250712
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