The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1038-95-5, Name is Tri-p-tolylphosphine, molecular formula is C21H21P. In a Article£¬once mentioned of 1038-95-5, Safety of Tri-p-tolylphosphine
Kinetic Investigation of Homogeneous H2-D2 Equilibration Catalyzed by Pt-Au Cluster Compounds. Characterization of the Cluster [(H)Pt(AuPPh3)9](NO3)2
The new Pt-Au hydrido cluster compound [(H)Pt(AuPPh3)9](NO3)2 (3) has been synthesized and characterized by NMR, FABMS, and single-crystal X-ray diffraction [triclinic, P1, a = 17.0452(1) A, b = 17.4045(2) A, c = 55.2353(1) A, alpha = 89.891(1), beta = 85.287(1), gamma = 75.173(1), V = 15784.0(2) A3, Z = 4 (two molecules in asymmetric unit), residual R = 0.089 for 45 929 observed reflections and 3367 variables, Mo Kalpha radiation]. The Pt(AuP)9 core geometry is a distorted icosahedron with three vertices vacant. The Pt-Au, Au-Au, and Au-P distances are within the normal ranges observed in other Pt-Au clusters. This cluster is a catalyst for H2-D2 equilibration in homogeneous solution phase and has been used in a general mechanistic study of this reaction catalyzed by Pt-Au clusters. We previously proposed that a key step in the mechanism for catalytic H2-D2 equilibration is the dissociation of a PPh3 ligand to give a cluster with an open Au site for bonding of H2 or D2. This was based on qualitative observations that PPh3 inhibited the rate of HD production with [Pt(AuPPh3)8]-(NO3)2 (1) as catalyst. In order to test this hypothesis, phosphine inhibition (on the rate of HD production) and phosphine ligand exchange kinetic experiments were carried out with [(H)(PPh3)Pt(AuPPh3)7](NO3) 2 (2) and 3. In this paper we show that the rate constant for phosphine dissociation determined from the PPh3 inhibition rate study of H2-D2 equilibration with cluster 2 is nearly identical to the rate constant for dissociative phosphine ligand exchange. The slower rate for H2-D2 equilibration observed with 3 compared with 2 (5.5 ¡Á 10-3 vs 7.7 ¡Á 10-2 turnover s-1) is explained by its smaller rate constant for phosphine dissociation (2.8 ¡Á 10-5 vs 2.9 ¡Á 10-4 s-1). The fact that clusters 2 and 3 show similar kinetic behaviors suggests that the PPh3 dissociation step in the catalytic H2-D2 equilibration is general for 18-electron hydrido Pt-AuPPh3 clusters.
The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 1038-95-5 is helpful to your research., Safety of Tri-p-tolylphosphine
Reference£º
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate