Formation of a Heterometallic AlIII/SmIII Complex Involving a Novel [EtAl(2-py)2O]2– Ligand (2-py = 2‑Pyridyl)

Controlled O2 oxidation of the Sm­(II) sandwich compound [{EtAl­(2-py)3}2­Sm] (1a) gives the Sm­(III)/Al­(III) compound [{EtAl­(2-py)3}­{EtAl­(2-py)2O}­Sm]2 (2), containing the novel multifunctional dianionic ligand [EtAl­(2-py)2­O]2–. The formation of an O-bridged Al-O-Sm arrangement in the structure of 2 is potentially relevant to the catalytic epoxidation of styrene with dry air using heterobimetallic sandwich compounds like 1a.