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Kinetically inert and yet catalytically active is the lanthanum complex 1, whereas the analogous Eu and Dy complexes catalyze neither cleavage of RNA oligomers nor transes-terification of a phosphate diester. A possible explanation for the different behavior is the size of the La3+ ion, which enables an expansion of the coordination sphere from nine to ten.
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Amin et al. (1994) studied this question.
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