115650-90-3

Basic information

• Product Name: Mn(CO)3(biacetyl bis(phenylimine))Cl
• CAS NO: 115650-90-3
• Molecular Weight: 410.739
• Mol File: 115650-90-3.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: Mn(CO)3(biacetyl bis(phenylimine))Cl(CAS DataBase Reference)
• NIST Chemistry Reference: Mn(CO)3(biacetyl bis(phenylimine))Cl(115650-90-3)
• EPA Substance Registry System: Mn(CO)3(biacetyl bis(phenylimine))Cl(115650-90-3)

Safety Data

• Hazardous Substances Data: 115650-90-3(Hazardous Substances Data)

Upstream product

• 14100-30-2 pentacarbonylchloromanganese(I) 

Relevant articles and documents

Ligand substitution in manganese(I) carbonyl complexes Mn(CO)5X (X = Cl, Br): Activation parameters and X-ray structure of Mn(CO)3(dab)Cl (dab = biacetyl bis(phenylimine))

Visible spectrophotometry at ambient and elevated pressure has been applied to study the kinetics of ligand substitution in pentacarbonylhalomanganese(I) complexes Mn(CO)5X (X = Cl, Br) by bidentate diimine ligands LL (dab (biacetyl bis(phenylimine)), dab-Cl (biacetyl bis(4-chlorophenylimine)), dab-OCH3 (biacetyl bis(4-methoxyphenylimine)), bpy (2,2′-bipyridine), and phen (1,10-phenanthroline)) in the solvents toluene and 1,2-dichloroethane (1,2-DE). The rate of formation of the product Mn(CO)3(LL)X is in most cases governed by a one-term rate law, rate = k[Mn(CO)5X], and in some cases by a two-term rate law, rate = (k + kLL[LL])[Mn(CO)5X]. Rate constant k is independent of the nature of the incoming ligand LL. The occurrence of a minor second-order contribution kLL[LL] in some of the systems is attributed to decomposition reactions at higher temperatures or to the effect of water as introduced in the form of phen·H2O. The activation parameters as derived from the temperature and pressure dependence of rate constant k in toluene are ΔH≠ = 24.5 ± 0.9 kcal mol-1, AΔS≠ = 8.8 ± 3.0 eu, ΔV≠ = 20.6 ± 0.4 cm3 mol-1 (system Mn(CO)5Cl/dab), ΔH≠ = 24.4 ± 1.6 kcal mol-1, ΔS≠ = 3.7 ± 5.3 eu (system Mn(CO)5Br/dab), and ΔH≠ = 26.2 ± 0.5 kcal mol-1, ΔS≠ = 9.9 ± 1.6 eu (system Mn(CO)5Br/dab-OCH3). The results support the operation of a limiting dissociative (D) mechanism with k describing the rate of dissociation of a cis-CO ligand from Mn(CO)5X. Ligand substitution in Mn(CO)5Cl is faster than that in Mn(CO)5Br by a factor of 10. As compared to toluene the solvent 1,2-DE reduces the reactivity of Mn(CO)5Br by a factor of 2.2. The product Mn(CO)3(dab)Cl [C19H16ClMnN2O3] crystallizes in the monoclinic space group P21/m with a = 878.0 (2) pm, b = 1852.3 (3) pm, c = 622.1 (1) pm, β = 101.950 (5)°, and Z = 2. The ligands around the manganese form a slightly distorted octahedron with a facial arrangement of the three CO groups.