Synthesis and characterisation of a semipseudocloso carbaruthenaborane. Molecular structure of [1-(PhCC)-2-Ph-3-(cym)-3,1,2-semipseudocloso-RuC2 B9H9] (cym = p-cymene)
Abstract
The closo carbaborane
1-(PhCC)-2-Ph-1,2-C
2
B
10
H
10
was readily
decapitated to afford either
[7-(PhCC)-8-Ph-7,8-C
2
B
9
H
10
]
-
or
[7-(PhCC)-8-Ph-7,8-C
2
B
9
H
9
]
2
-
. Reaction of the thallium(I) salt of the latter
with [{RuCl
2
(cym)}
2
]
(cym = p-cymene) yielded the unique
semipseudocloso carbaruthenaborane
[1-(PhCC)-2-Ph-3-(cym)-3,1,2-RuC
2
B
9
H
9
]
characterised by multinuclear NMR spectroscopy (weighted average
11
B chemical shift +2.41 ppm) and by single-crystal X-ray
diffraction [C(1)–C(2) 2.184(7),
Ru(3)
···B(6)
3.166(6) Å]. The semipseudocloso shape thus appears to
lie between closo and pseudocloso, although somewhat
closer to the latter. Confirmation of the structure strongly supports
the idea of a continuum of cluster structures from closo to
pseudocloso, the position of a molecule on which may be
controlled by steric effects.
···B(6)
3.166(6) Å]. The semipseudocloso shape thus appears to
lie between closo and pseudocloso, although somewhat
closer to the latter. Confirmation of the structure strongly supports
the idea of a continuum of cluster structures from closo to
pseudocloso, the position of a molecule on which may be
controlled by steric effects.
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