Pyridyl Compounds of Heavier Group 13 and 14 Elements as Ligands for Lanthanide Metals

Abstract

Reactivity studies of three different tris(2-pyridyl)stannate derivatives toward the Ln(II) compounds [Ln(Cp*)2(OEt2)] (Ln = Yb, Sm; Cp* = η5-C5Me5) are described. Thus, treatment of [La(Cp)3{Sn(2-py5Me)3Li(thf)}] (Cp = η5-C5H5, py5Me = C5H3N-5-Me) with [Yb(Cp*)2(OEt2)] afforded the pentametallic complex [Yb{Sn(2-py5Me)3La(Cp)3}2] (1) with the Yb2+ cation encapsulated by two tris(2-pyridyl)stannate units and two unsupported Sn–La bonds in terminal positions. On the other hand, reaction of the bis(stannate) complex [Yb{Sn(2-py3Me)3}2] (py3Me = C5H3N-3-Me) with [Yb(Cp*)2(OEt2)] gave the heteroleptic complex [Yb(Cp*){Sn(2-py3Me)3}] (2). Moreover, two samarium(III) compounds [Sm(Cp*)2{MEt2(2-py5Me)2}] with M = Ga (3), In (4) were obtained in a reductive approach. Compounds 1–4 have all been characterized by NMR spectroscopic and X-ray crystallographic studies.