Highly Sterically-Crowded Subvalent Group 14 Compounds: Unexpected Structures and High Reactivity with Small Molecules

A series of new compounds, MAr2 (M = Ge, Sn, or Pb; Ar = terphenyl ligands) display structures and structural trends that are counter-intuitive with regard to steric effects. These trends are also reflected in their spectroscopic properties and in their reaction chemistry. It was found that the presence or absence of substituents at apparently-remote sites on the ligands can exert a large influence on the course of the reactions, as well as on the structural characteristics of the group 14 element environment.

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