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Interpretation of lanthanide-induced shifts in NMR spectra. The case of nonaxial symmetry

1983; Elsevier BV; Volume: 52; Issue: 2 Linguagem: Inglês

10.1016/0022-2364(83)90185-3

1557-8968

T. A. Babushkina, V. F. Zolin, L. G. Koreneva,

Advanced MRI Techniques and Applications

The approach to the treatment of low-symmetry systems by the method of lanthanide shift reagents (LSR) is considered. Analysis of the results obtained by optical spectroscopy (mostly by luminescense spectroscopy of Eu3+ ion) is used for this purpose. From the spectra mentioned, a model of the LSR adduct and parameters describing anisotropy of magnetic susceptibility are obtained. The method is applied to several rare-earth complexes of nonaxial symmetry. Bleaney's theory connecting pseudocontact NMR shifts to crystal field parameters of the second order is verified and shown to be correct if the crystal field splittings are of the order of kT. The systems Ln(dpm)3 and Ln(fod)3 are discussed.