Bis(allyl) ruthenium(IV) complexes. Part 2. Ruthenium complexes containing σ- and µ-pyrazine and σ- and µ-bis(diphenylphosphino)methane (dppm) ligands. Crystal structures of [{Ru(η3:η3-C10H16)Cl2}2(µ-dppm)]·Me2CO·CH2Cl2 and [{Ru(η3:η3-C10H16)Cl2}{Ru(η6-C6H6)Cl2}(µ-dppm)]·1.5CHCl3

Abstract

Reaction of [{Ru(η³:η³-C₁₀H₁₆)(µ-Cl)Cl}₂]1(C₁₀H₁₆= 2,7-dimethyloctadienediyl) with one equivalent of pyrazine (pyz) or bis(diphenylphosphino)methane (dppm) leads to the formation of the neutral dimeric products [{Ru(η³:η³-C₁₀H₁₆)Cl₂}₂(µ-pyz)]2a and [{Ru(η³:η³-C₁₀H₁₆)Cl₂}₂(µ-dppm)]2b respectively. The neutral monomeric complexes [Ru(η³:η³-C₁₀H₁₆)Cl₂(σ-pyz)]3a and [Ru(η³:η³-C₁₀H₁₆)Cl₂(σ-dppm)]3b are obtained by reacting 1 with two equivalents of pyz and dppm respectively. The mixed valence diruthenium complex [{Ru(η³:η³-C₁₀H₁₆)Cl₂}{Ru (η⁶-C₆H₆)Cl₂}(µ-dppm)]5 is readily obtained from the reaction of 3b with [{Ru(η⁶-C₆H₆)(µ-Cl)Cl}₂]4. The X-ray structures of complex 2b[space group P(no. 2), a= 11.914(1), b= 11.943(2), c= 19.524(2)Å, α= 105.79(1), β= 107.64(1), γ= 91.01(1)°, Z= 2], and complex 5[space group P2₁(no. 4), a= 10.259(1), b= 21.284(2), c= 21.058(3)Å, β= 94.48(1)°, Z= 4] are reported.