Eight-co-ordination in lanthanide pyrazolylborate chemistry: crystal structures of [LaTpMe,Me2(MeCN)(O3SCF3)] ·MeCN, [NdTpMe,Me2(MeCN)2][O3SCF 3] and [LaTpMe,Me2(NO3)]·MeCN [TpMe,Me = tris(3,5-dimethylpyrazolyl) hydroborate]
Abstract
The reaction of
[LnTp
Me,Me
2
][O
3
SCF
3
]
[Ln = La, Ce, Pr or Nd;
Tp
Me,Me
= tris(3,5-dimethylpyrazolyl)
hydroborate] in toluene with acetonitrile gave complexes of
stoichiometry
LnTp
Me,Me
2
(MeCN)
2
(O
3
SCF
3
) (Ln = La, Ce, Pr or Nd). The structures of
those of La and Nd have been determined by X-ray crystallography and
found to be ionization isomers of each other:
[LaTp
Me,Me
2
(MeCN)(O
3
SCF
3
)]
·MeCN consists of neutral molecules while
[NdTp
Me,Me
2
(MeCN)
2
][O
3
SCF
3
] adopts an ionic structure. The structure of
[LaTp
Me,Me
2
(NO
3
)] has been determined
for comparison. The co-ordination environment of the metal centres in
all three complexes was shown by polytopal analysis to be dodecahedral
in contrast to that (square antiprismatic) commonly adopted by complexes
involving unsubstituted hydrotris(pyrazolyl)borate.
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