Lithium bridged cyclosiloxy-niobium(V) and
-tantalum(V) complexes: thermal decomposition, solid-state
and solution structural studies
†
Abstract
Treatment of MCl
5
(M = Nb or Ta) with 3
equivalents of dilithium tetraphenyldisiloxanediolate,
[(Ph
2
SiOLi)
2
O], gave the lithium-bridged
metallasiloxane complex,
[M{O(SiPh
2
O)
2
}
3
]-µ-[Li(L)
2
] (M = Nb 1 or M = Ta 2;
L = pyridine). The solid-state structure of compound 2
determined by single crystal X-ray diffraction is reported.
Variable-temperature
7
Li NMR of 2 revealed two separate
exchange processes which may account for the equilibration of
non-equivalent silicon environments in 1 and 2. Preparative scale
thermal decomposition of the solid samples with
L = tetrahydrofuran (thf) gave crystalline
LiNbO
3
and LiTaO
3
.
) gave crystalline
LiNbO
3
and LiTaO
3
.
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