Reaction between the tetrachloropalladate(II) ion and 1,10-phenanthroline

Abstract

The reaction of KzPdC14 and 1,lO-phenanthroline in aqueous solution gives a quantitative yield of Pd(phen)C12. The rate is first order in palladium complex and first order in phenanthroline. There are a t least three routes to the product; phenanthroline attacks PdCLZ-(kz = 2.23 M-' sec-lat 25') and Pd(Hz0)Cla-(Kz = 71 M-' sec-') as well as one or more hydroxo complexes ( k~ > 100 M-' sec-I). The reaction is unusually slow and insensitive to the basicity of phenanthroline and to whether or not it is protonated. Both associative (A) and dissociative interchange ( I d ) mechanisms are considered in analyzing the data. CONTRIBUTION FROM THE EVANS CHEMICAL LABORATORY, THE OHIO STATE UNIVERSITY, COLUMBUS, OHIO 43210 Arsenic-Sulfur Polydentate Ligands. I. Palladium(I1) Complexes of Bis [phenyl(othiomethylphenyl)arsino]propane and Bis [phenyl(o-thiomethylpheny1)arsinolethane Syntheses of two potentially quadridentate arsenic-sulfur ligands, l,3-bis[phenyl(o-thiomethylphenyl)arsino] propane (C3) and 1,2-bis[phenyl(o-thiomethylphenyl)arsinol ethane (CZ) are described. A variety of palladium(I1) complexes of these two ligands have been prepared and structural assignments have been made on the basis of synthetic reactions, conductance, electronic spectra, molecular weight, and pmr data.(1) Pd(C,)X2

Palladium‐catalyzed electroless plating of gold on latex particle surfaces

“…Ultraviolet–visible (UV–vis) absorbances at 430 nm were measured to determine the concentration of ionic palladium species with a Spectronic Genesys 2 UV–vis instrument (Thermo Electron Corp., Waltham, MA). The chemistry of palladium halides in aqueous solutions is dominated by hydrolysis, which results in the formation of water‐insoluble hydroxo‐ or chloro‐bridged palladium(II) oligomer precipitates 25–31. In this work, the pH was maintained at 2 because hydrolysis could be thermodynamically suppressed by the pH being kept low or by external chloride ions being added 32…”

Electroless Deposition of Metal Nanoislands on Aminothiolate-Functionalized Au(111) Electrodes

“…This necessitates that the concentration of hydroxo-and/or chloro-bridged oligomers (for simplicity we call them “Pd nodules” from here on) is kept as low as possible. For this reason we calculated from the reaction constants the required concentration of H + and Cl - to have almost only PdCl 4 2- present in the solution. ,,,, In Figure the normalized concentrations of the species are shown for pH = 1 and 5 as a function of the Cl - concentration. For our experiments we chose a Pd 2+ solution at pH = 1 with [Cl - ] = 0.7 M. In this case the solution contains 86.6% PdCl 4 2- , 12.4% PdCl 3 (H 2 O) - , 0.9% PdCl 2 (H 2 O) 2 , 1.3 × 10 -5 % PdCl 3 (OH) 2- , and 5 × 10 -4 % PdCl 2 (H 2 O)(OH) - (calculated).…”

A novel polymer electrolyte based on oligo(ethylene glycol) 600, K2PdCl4, and K3Fe(CN)6

“…In the first step two solutions (A and B) are mixed. 15,16 This nucleophilic substitution occurs in two ways 13 : (a) substitution of a Clby the nucleophilic atom of the ligand; (b) substitution of Clin PdCl 4 2by an H 2 O molecule and then replacement of the H 2 O by a ligand donor group. After incorporation of solution A into B some well-established reactions are predicted to take place.…”