Synthesis, Structure and Reactivity of Ruthenium(II) Carbonyl Complexes Containing Bis(pyrazol‐1‐yl)methane and Bis(N‐methylimidazol‐2‐yl)methane

Abstract

A series of ruthenium(II) complexes with the pyrazolylalkane ligands bis(pyrazol-1-yl)methane (BPM) (I) and bis(3,5-dimethylpyrazol-1-yl)methane (dmBPM) (II), and the imidazolylalkane ligand bis(N-methylimidazol-2-yl)methane (BIM) (III) have been synthesised and characterised. The complexes [Ru(N-N)(CO) 2 X 2 ] [N-N = BPM, X = Cl (1a), Br (1b); N-N = dmBPM, X = Cl (2); N-N = BIM, X = Cl (3)] were prepared from the stoichiometric reaction of [Ru(CO) 2 X 2 ] n and the bidentate N-donor ligand in refluxing methanol. The crystal structure of 2 showed the complex to have octahedral geometry about the ruthenium centre, with the carbonyl and

Frozen matrix photolysis of Group VIII M(CO)2Cl2L2 derivatives: Direct observation of CO-loss species and photochemical isomerization

“…CO-loss is attributed to 1 MLCT or 1 XLCT excited states that become dissociative through a strongly avoided crossing with a higher lying LF state. We were curious to compare the behavior of the bipyridine derivative with that of CH 2 (MeImid) 2 and CH 2 (Me 2 Pz) 2 recently reported by Messerle et al [26], and with the TMEDA derivative that has no available p * orbitals.…”

{μ-Bis(1-methylimidazol-2-yl)methane-κ2N3:N3′}bis{[(1-methylimidazol-2-yl)methane-κ2N3,N3′]copper(I)} bis(trifluoromethanesulfonate)

“…For the protonated ligand Me 2 BIM, see: Messerle et al (2003). For coordination complexes with one or two Me 2 BIM ligands chelating one metal center, see: Elgafi et al (1999); Abuskhuna et al (2004a); Burling et al (2004); Kennedy et al (2007); Dabb et al (2009).…”