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

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.