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)

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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.

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