Bis(acetylacetonato)ruthenium(II) complexes containing bulky tertiary phosphines. Formation and redox behaviour of Ru(acac)2 (PR3) (R=iPr, Cy) complexes with ethene, carbon monoxide, and bridging dinitrogen

Synthesis and structures of two ruthenium dibenzoylmethane triphenylphosphine mixed ligand complexes

“…Some of them reveal good catalytic effects [7,8] and remarkable biological activities [9,10]. However, in spite of extensive work, only a few fully structurally characterized ruthenium b-diketonate complexes containing phosphines have been published, so far [11][12][13][14][15].…”

Bis(acetylacetonato)ruthenium(ii) complexes containing alkynyldiphenylphosphines. Formation and redox behaviour of [Ru(acac)2(Ph2PCCR)2] (R = H, Me, Ph) complexes and the binuclear complex cis-[{Ru(acac)2}2(µ-Ph2PCCPPh2)}2]

“…As in the latter series, 42 the cis-isomers of 4 and 5 are harder to oxidise than the corresponding trans-isomers by about 300 mV. Further, both cis-and trans-alkynyldiphenylphosphine complexes 41 has shown more than one oxidation potential in the range between 0.0-1.5 V and none shows evidence for a Ru(III) → Ru(IV) oxidation process. [40][41][42]54,55 The first oxidation process for cis-6 is ca.…”

“…Further, both cis-and trans-alkynyldiphenylphosphine complexes 41 has shown more than one oxidation potential in the range between 0.0-1.5 V and none shows evidence for a Ru(III) → Ru(IV) oxidation process. [40][41][42]54,55 The first oxidation process for cis-6 is ca. 150 mV higher than the corresponding potentials found for cis-4 and cis-5, probably as a consquence of the p-acceptor ability of l-dppa, which stabilises Ru(II).…”

The fragment bis(acetylacetonato)ruthenium: a meeting-point of coordination and organometallic chemistry

“…Under the same conditions, triphenylstibine reacts with either 2 or 3 to give complexes of the type cis-[Ru(acac) 2 (g 2 -alkene)(SbPh 3 )], which reacts further with Ph 3 Sb to give cis-[Ru(acac) 2 (SbPh 3 ) 2 ]; in neither step can a trans-isomer be detected. Werner et al [30] have reported the preparation of the related complex Of the P-donor ligands listed in Scheme 1, triisopropylphosphine and tricyclohexylphosphine are unique in reacting in a 1:1 mol ratio with 3 in benzene to give isolable mono-substitution products cis-[Ru(acac) 2 (g 2 -C 2 H 4 )(L)] [L = P i Pr 3 (4), PCy 3 (5)], which then react further with L to give initially trans-and then cis-[Ru (acac) 2 L 2 ] [40]. The ethene in complexes 4 and 5 is remarkably labile, being partly replaced even by THF, though there is no evidence from the Ru-C distances in the X-ray structures of the complexes that the Ru-C 2 H 4 interaction is particularly weak.…”

“…[{Ru(acac) 2 (P i Pr 3 )} 2 (l-N 2 )] (5) (Scheme 2) [40]. This exists as a mixture of diastereomers 5a and 5b in solution arising from the presence of two chiral cis-[Ru(acac) 2 L] fragments, although only the homochiral diastereomer 5a is found in the solid state.…”