135157-53-8Relevant academic research and scientific papers
Reactions of : Carbaborane Cage Transfer from Gold to Rhodium
Jeffery, John C.,Jelliss, Paul A.,Stone, F. Gordon A.
, p. 1073 - 1082 (2007/10/02)
The reagent has been prepared, and used to synthesise several mixed-metal complexes in which gold atoms are bonded to rhodium.Thus treatment of the gold salt with trans- or in thf (tetrahydrofuran), in the presence of TlBF4, affords the complexes 5-7,8-C2B9H9Me2)> (L = PPh3 or CO), respectively.Reaction of the gold species with gives the complex , the structure of which has been established by X-ray diffraction.The latter complex in solution exists in equilibrium with a minor isomer 5-7,8-C2B9H9Me2)> containing a closo-3,1,2-RhC2B9 cage system.With the rhodium complex (cod = cycloocta-1,5-diene), and in the presence of molecular hydrogen, the gold reagent yields a chromatographically separable mixture of and 5-7,8-C2B9H9Me2)>.A single-crystal X-ray diffraction study has established the structure of the rhodium-digold compound.The NMR data (1H, 13C-(1H), 31P-(1H) and 11B-(1H)) for the new compounds are reported and discussed in relation to their structures.
Carbaboranerhodium Complexes with Rh-Rh, Rh-Cu and Rh-Au Bonds; Crystal Structure of 5-C2B9H8Me2)(CO)3(η5-C2B9H9Me2)>
Pilotti, Massimino U.,Topaloglu, Isil,Stone, F. Gordon A.
, p. 1355 - 1360 (2007/10/02)
The compound 5-C2B9H9Me2)> has been prepared and used to synthesise the dimetal complexes 5-C2B9H9Me2)> (M = Cu or Au) and 5-C2B9H9Me2)>.Protonation of 5-C2B9H9Me2)> gives an unstable hydride 5-C2B9H9Me2)>.In contrast, treatment of 5-C2B9H9Me2)> with HBF4*Et2O affords a dirhodium complex 5-C2B9H9Me2)2> in which one carbaborane fragment bridges the Rh-Rh bond via an exopolyhedral B-H->Rh bond.This species can be deprotonated to give an anionic complex 5-C2B9H8Me2)(CO)3(η5-C2B9H9Me2)>-, the + salt which may be obtained directly from 5-C2B9H9Me2)> by treatment of the latter with Cl.An X-ray crystallographic study established the structure of the anion.One rhodium centre is ligated by a CO molecule and by a C2B9H9Me2 cage in the normal η5 bonding mode, the other carries two CO groups and an η5-C2B9 cage.However, a boron atom β to the carbons in the pentagonal open CCBBB face of this cage forms a ? bond to the other rhodium atom , so that this C2B9H8Me2 group bridges the Rh-Rh bond .The NMR data for the new compounds are reported and discussed.
