Fluoride clusters of lanthanoids can be prepared in organic solvents by metathetical reactions of Ln(SePh)3 with NH4F. The first products of these reactions, [(py)24Ln28F68(SePh)16] (Ln=Pr, Nd; py=pyridine; see structure), are currently the largest discrete lanthanoid clusters ever isolated. Emission experiments on the neodymium compound reveal a near-IR quantum efficiency of 41 %.
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Romanelli et al. (2008) studied this question.
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