Abstract

SANHUEZA, JULIO; CONTRERAS, RAUL  and  VALDERRAMA, MAURICIO. RHODIUM(III) AND RUTHENIUM(II) COMPLEXES WITH THE CHIRAL PHOSPHINE-ALCOHOL Ph₂PCH₂CHMeCH₂OH: SYNTHESIS AND CHARACTERISATION. Bol. Soc. Chil. Quím. [online]. 2002, vol.47, n.3, pp.227-233. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442002000300005.

Reaction of the dinuclear complex [{(h⁵-C₅Me₅)RhCl} ₂(µ-Cl)₂] with the chiral phosphine (R)-Ph₂PCH₂CHMeCH₂ OH leads to the complex [{(h⁵-C₅Me₅)RhCl ₂(h¹-Ph₂PCH₂ CHMeCH₂OH-P)](1). This reaction, in the presence of AgBF₄, yields the cationic compound [{(h⁵-C₅Me₅)RhCl(h ²- Ph₂PCH₂CHMeCH₂OH-P,O)]BF ₄(2). Variable-temperature ¹H NMR and circular dichroism experiments support the stereoselective h²-chelate coordination of the ligand and the proposed configuration for the metal centre. In a similar way, the reaction of the dimer [{(h⁶-C₆Me₆)RuCl} ₂(µ-Cl)₂] with the ligands (R)- and (S)-Ph₂PCH₂CHMeCH₂ OH afford the neutral complexes [(h⁶-C₆Me₆)RuCl ₂{h¹-PPh₂CH₂ CHMeCH₂OH-P}] [R-ligand (3), S-ligand (4)], which in turn react with AgBF₄ to give the cationic compounds [(h⁶-C₆Me₆)RuCl{h ²-PPh₂CH₂CHMeCH₂ OH-P,O}]BF₄ [R-ligand (5), S-ligand (6)]. All complexes have been characterised by elemental analysis, IR and multinuclear NMR spectroscopies

Keywords : Rhodium; ruthenium; chiral bidentate ligand; chiral phosphine; chiral-at-metal complexes.