P₄ Activation with Pt⁰ Metal Centers: Selective Formation of a Dinuclear {Pt₂(μ,η^2:2‐P₂)} Complex

Abstract

Turbulent precipitation is a complex problem, whose mathematical description of precipitation requires a coupling of fluid dynamics with the population balance equation (PBE). In the case of turbulent flow, this coupling results in unclosed equations due to the nonlinear nature of precipitation kinetics. In this article, we present a methodology for modeling turbulent precipitation using the concept of the transported probability density function (PDF) in conjunction with a discretized PBE, simulated via a Lagrangian stochastic method. The transported PBE‐PDF approach resolves the closure problem of turbulent precipitation for arbitrarily complex precipitation kinetics, while retrieving the full particle size distribution (PSD). The method is applied to the precipitation of BaSO4 in a turbulent pipe flow and comparisons are made with the experimental results of Baldyga and Orciuch (Chem Eng Sci. 2001;56:2435‐2444) showing excellent agreement, while insight is drawn into the mechanisms that determine the evolution of the product PSD. © 2009 American Institute of Chemical Engineers AIChE J, 2010

Stabilizing P≡P: P22–, P2⋅–, and P20 as bridging ligands

“…Note, that the side-on bound (P2) 4ligand in Mezailles' complex [(µ 2 ,η 2 :η 2 -P2){Pt(dppp)}2] was found at even higher field (δP = +49.3 ppm). 68 Accordingly, the lowenergy *(P2)→*(P2) electronic transition observed for 2 and 3 is absent for 4. Mutual coupling of 1 JPP'= 300 Hz was obtained for the magnetically inequivalent nuclei of the P2 bridge of 4, which compares well with the computational estimate for free P≡P (| 1 Jiso|= 498 Hz) by Wasylishen and co-workers.…”

Nanoscale Metal Phosphide Phase Segregation to Bi/P Core/Shell Structure. Reactivity as a Source of Elemental Phosphorus

“…This would be an interesting feature as red phosphorus is easier to handle and not as toxic as white phosphorus, but it is conversely far less reactive than the white allotrope. We have shown in the past that red P reacts quantitatively with Br 2 to form PBr 3 and in the presence of an excess of Br 2 to form PBr 5 . In order to verify the accessibility of the phosphorus shell in our Bi/P NPs despite the existence of phosphorus oxides, the reactivity of the three types of NPs toward Br 2 was evaluated at room temperature (Scheme ).…”

“…We have shown in the past that red P reacts quantitatively with Br 2 to form PBr 3 and in the presence of an excess of Br 2 to form PBr 5 . 58 In order to verify the accessibility of the phosphorus shell in our Bi/P NPs despite the existence of phosphorus oxides, the reactivity of the three types of nanoparticles towards Br 2 was evaluated at room temperature (Scheme 2).…”

Platinum(II) complexes of some unsymmetrical diphosphenes

“…More recent studies on unsymmetrical diphosphenes, usually with a phosphorus-containing substituent on one of the diphosphene phosphorus atoms, and some metal complexes thereof, have also appeared in the literature. [10][11][12][13][14] We have described the transition metal-catalysed metathesis of phosphorusphosphorus double bonds, in which symmetrical or unsymmetrical diphosphenes can be synthesised from appropriate dichlorophosphanes by interaction with W(PMe 3 ) 6 , as shown in equation (1) for an unsymmetrical species. [15] RPCl 2 + R'PCl 2 + W(PMe 3 ) 6 RP=PR' + 3 PMe 3 + WCl 4 (PMe 3 ) 3 (1)…”