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J Am Chem Soc. 2012 Oct 17;134(41):16983-6. doi: 10.1021/ja308077t. Epub 2012 Oct 4.

[Ln(BH4)2(THF)2] (Ln = Eu, Yb)--a highly luminescent material. Synthesis, properties, reactivity, and NMR studies.

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Institut für Anorganische Chemie, Karlsruher Institut für Technologie, Engesserstraße 15, 76131 Karlsruhe, Germany.


The divalent lanthanide borohydrides [Ln(BH(4))(2)(THF)(2)] (Ln = Eu, Yb) have been prepared in a straightforward approach. The europium compound shows blue luminescence in the solid state, having a quantum yield of 75%. Nonradiative deactivation of C-H and B-H oscillator groups could be excluded in the perdeuterated complex [Eu(BD(4))(2)(d(8)-THF)(2)], which showed a quantum yield of 93%. The monocationic species [Ln(BH(4))(THF)(5)][BPh(4)] and the bis(phosphinimino)methanides [{(Me(3)SiNPPh(2))(2)CH}Ln(BH(4))(THF)(2)] have been prepared from [Ln(BH(4))(2)(THF)(2)]. They show significantly lower or no luminescence. Using the diamagnetic compound [{(Me(3)SiNPPh(2))(2)CH}Yb(BH(4))(THF)(2)], we performed a 2D (31)P/(171)Yb HMQC experiment.


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