Concepedia

Remarkable Stability of Metallocenes with Superbulky Ligands: Spontaneous Reduction of Sm<sup>III</sup> to Sm<sup>II</sup>

C. Ruspic, John R. Moss, Markus Schürmann, Sjoerd Harder

Angewandte Chemie International Edition · 2008 · 118 citations · 45 references

DOI

Concepts

Abstract

Unexpected attraction between extremely bulky cyclopentadienyl ligands of opposite chirality has been observed in perarylated metallocenes [(Ar5C5)2M]. The exceptional stability of such sterically congested metallocenes (see structure) is explained by a merry-go-round CH⋅⋅⋅C(π) hydrogen-bond network. This stabilizing force even enables spontaneous reduction of a SmIII precursor to a SmII metallocene.

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