Coordination of the nido-carboranyldiphosphine ligand to ruthenium(II): the first example of the tricoordinating capacity of the 7,8-(PPh2)2-7,8-C2B9H10 moiety

✍ Scribed by Rosario Núñez; Clara Viñas; Francesc Teixidor; Ma Mar Abad

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 240 KB
• Volume: 17
• Category: Article
• ISSN: 0268-2605
• DOI: 10.1002/aoc.464

✦ Synopsis

Abstract

Reaction of [RuH(AcO)(PPh~3~)~3~] and [NMe~4~][7,8‐(PPh~2~)~2~‐7,8‐C~2~B~9~H~10~] in methanol yields [RuH(7,8‐(PPh~2~)~2~‐7,8‐C~2~B~9~H~10~)(PPh~3~)~2~] (1). The reaction of [RuCl~2~(PPh~3~)~3~] and [NMe~4~][7,8‐(PPh~2~)~2~‐7,8‐C~2~B~9~H~10~] in a 1 : 1 or 1 : 2 ratio in methanol yields [RuX(7,8‐(PPh~2~)~2~‐7,8‐C~2~B~9~H~10~)(PPh~3~)~2~] (X = Cl, H) (2). NMR spectroscopic analyses of 1 and 2 indicate that the centers have an octahedral geometry and the carborane acts as a tricoordinating ligand to ruthenium(II) by means of PRu, B(11)H→Ru and B(2)H→Ru agostic bonds. A chloride or hydride and two PPh~3~ ligands complete the coordination sphere of the metal. The formation of two BH→Ru agostic bonds rather than a second PRu bond appears to be due to steric factors. Reaction of [NMe~4~][7,8‐(PPh~2~)~2~‐7,8‐C~2~B~9~H~10~] with [RuCl~2~(PMePh~2~)~4~] in ratios of 1 : 1 and 2 : 1 in methanol yields complexes [Ru(7,8‐(PPh~2~)~2~‐7,8‐C~2~B~9~H~11~)~2~] (3) and [RuH(7,8‐(PPh~2~)~2~‐7,8‐C~2~B~9~H~11~)~2~] (4) respectively, which incorporate two nido‐carboranylphosphine ligands. Copyright © 2003 John Wiley & Sons, Ltd.