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- W2229845758 abstract "A major difficulty for evaluating the actual extent of covalent bonding in lanthanide compounds is that it is almost impossible to obtain direct evidence for the major part of the covalent deviations from purely ionic bonding using the empty shells (such as 5d and 6s) whereas, the minor part influencing the partly filled 4f shell has numerically small, but perfectly observable consequences. It is conceivable that the fractional charge on the neodymium atoms has been decreased below + 2 in solid Nd2S3 or volatile Nd(C5H5)3 by an average contribution of the sum of squared amplitudes of delocalized MO above 0.2 in each of the five 5d-like orbitals in the LCAO model, but at the same time it is beyond doubt that the J-level distances are much closer to the configuration [Xe]4f3 in gaseous Nd+3 (obtained by a conservative extrapolation from solid NdF3) than in gaseous Pr+2. These two properties are not incompatible, as we shall see below, but they contribute to a certain atmosphere of “double truth” permeating much theoretical discussion of rare earths. Furthermore, there is a major difference between the 3d, 4d and 5d groups on the one hand, and the 4f group on the other, so that the extent of partly covalent bonding in the former case is mainly determined by the electronegativities of the ligands, whereas, the highly varying distances to the first neighbour atoms add a second dimension to the description of the lanthanides, in particular in mixed oxides." @default.
- W2229845758 created "2016-06-24" @default.
- W2229845758 creator A5080738326 @default.
- W2229845758 creator A5090525375 @default.
- W2229845758 date "1977-01-01" @default.
- W2229845758 modified "2023-09-25" @default.
- W2229845758 title "Chemical Bonding and Lanthanide Spectra" @default.
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