Experimental access to the molecular and electronic structures of organo-f-element complexes by NMR spectroscopy |
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Authors: | Werner Jahn Kenan Yünlü Wolfgang Oroschin Hans-Dieter Amberger R.Dieter Fischer |
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Affiliation: | Institut für Anorganische und Angewandte Chemie der Universität Hamburg, Martin-Luther-King-Platz 6, D-2000 Hamburg 13, F.R.G. |
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Abstract: | The main objective of this survey is to demonstrate that by extensive assessment of variable temperature 1H NMR data obtained on paramagnetic f-element complexes in solution, not only valuable information on details of the molecular structure, but also on the electronic structure may be deduced. One of the most informative quantities to arrive at is the paramagnetic anisotropy term, χ∥ - χ⊥, of axially symmetric molecules from which, if the bulk susceptibility is also known, the crystal-field sensitive parameters χ∥ and χ⊥ can be derived.The majority of the examples considered belong to the widely studied type [Cp3fMLn]q (Cp = η5C5H4R); fM = Pr(III), Nd(III), Yb(III) and U(IV); n = 0, 1 and 2; q = 0 or ?1) and to the uranocene family. The survey also includes the two sub-classes of novel anionic complexes [Cp3LnL]? and [(Cp3Ln)2(μ-L)]?, respectively, and different isomers of the general composition [Cp3UXY]q (L = lanthanoid). |
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Keywords: | Author to whom correspondence should be addressed. |
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