Palladium II Bromide

Alternate Names palladium bromide palladium dibromide. Physical Data mp 717 2 °C X-ray structure.  

Form Supplied in commercially available as a dark brown powder. 

Preparative Methods palladium metal with HNO3 and HBr, electrosynthesis from palladium metal and HBr, and by palladium metal with Br2 at high temperature.  

General Considerations. The focus within this study is on reactions in which PdBra has found to be advantageous in comparison with other sources of Pd(n) catalyst such as PdCl2 and Pd(OAc)2. 

Oxidative Carbonylation ofAlkenes. The hydrocarboxylation of st)Tene with PdBt2-PPh3-acid under a CO atmosphere affords the branched carboxylic acid with high regioselectivity (eq 1).  

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Palladium(II) bromide + Br " —> PdBr, brownish-black color. 

Palladium(II) chloride is formed by direct combination of the elements at 500°C. It is the only stable chloride over 500 1500°C. The red crystals are partly soluble in water and completely soluble in HCL The fraction insoluble in water is probably a polymer. Palladium(II) chloride also is die product obtained by evaporation of a solution of Pd in HQ. Palladium(II) bromide can also be made from the dements. 

Palladium(II)-bromid bildet mindestens drei Modifikationen (169). Das bei Zimmertemperatur stabile y-PdBr2 wandelt sich oberhalb 550° C in eine (3-Modifikation um, die oberhalb 670° C in eine a-Modifi-kation iibergeht, Oberhalb 800° C zersetzt sich PdBr2 thermisch in die Elemente. 

Ans. (a) Iron(II) bromide and iron(III) bromide, FeBr2 and FeBrs (b) Palladium(II) bromide and palladium(rV) bromide, PdBr2 and PdBr4 (c) Mercury(I) bromide and mercury(II) bromide, Hg2Br2 and HgBr2. 

A V-bis [2-(dimethylamino)ethyl] -N1 ft-dimethyl-1,2-ethanediamine] bromo-palladium(II) bromide is a yellow diamagnetic solid. It melts at 210° with decomposition. It is very hygroscopic and must be handled and stored in a moisture-free atmosphere. It is soluble in water, chloroform, and dichloro-methane but insoluble in most other common laboratory solvents. The H nmr spectrum in D20 exhibits a single resonance at 2.60 ppm for the methyl protons. The electronic spectrum obtained on an aqueous solution is characterized by an absorption maximum at 352 nm (e = 792 L mole-1 cm"1). 

Palladium(II) bromide is also the palladium(II) salt of choice for the synthesis of monodisperse cobalt-palladium nanoparticles (CoPd NPs) that are active catalysts for formic acid oxidation and the methanolysis of ammonia borane7 The bromide anion is thought to play a role in the growth process of the CoPd NPs7 PdBr2(SMe2)2 is used in the synthesis of palladium-polyimide films. ... 

Stuart J. Mahoney University of Waterloo, Waterloo, Ontario, Canada Palladium(II) Bromide 491... 

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