Palladium crystal structure

Bivalent Nickel, Platinum, and Palladium.—Crystal structures of NEt CPtCls... 

Palladium, methylenebis(diphenylphosphine)bis-(thiocyanato)-linkage isomers, 1,185 Palladium, octafluoro-crystal structure, 1, 24... 

Palladium, polymethylenebis(diphenylphosphine)-bis(thiocyanato)-linkage isomers, 1, 185 Palladium, tetraammine-tetrachloropalladate history, 1, 2 Palladium, tetrachloro-crystal structure, 1, 16 Palladium, tris(dinitrogen)-synthesis, 1,28 Palladium complexes a,(5-dione dioximates electrical properties, 6, 143 acetylacetone hydrolysis, 2,379 alkylperoxo... 

Interstitial Solid Solutions Interstitial solid solutions involve occupation of a site by introduced ions or atoms, which is normally empty in the crystal structure, and no ions or atoms are left out. Many metals form interstitial solid solutions in which small atoms (e.g., hydrogen, carbon, boron, nitrogen) enter empty interstitial sites within the host structure of the metal. Palladium metal is well known for its ability to absorb an enormous volume of hydrogen gas, and the product hydride is an interstitial sohd solution of formula PdH, 0 0.7, in which hydrogen atoms occupy... 

A trinuclear system, whose structure was published,555 was formed in high yield by the cyclometalation of a l,3-bis(alkylbenzimidazol-2-yl)benzene ligand, followed by the trimerization of the unit, which possesses a vacant coordination site on the palladium atom and a pendant noncoordinated benzimidazole moiety. The resulting product forms a cup-shaped trimer or tricorn, presented in Figure 46, that includes a molecule of acetonitrile in the crystal structure.556... 

Fig. 11 X-ray crystal structure of palladium catalyst based on ligand b in Fig. 10...

Ellis, J.W., Harrison, K.N., Hoye, P.A.T., Orpen, A.G., Pringle, P.G., and Smith, M.B., Water-soluble tris(hydroxymethyl)phosphine complexes with nickel, palladium, and platinum. Crystal structure of Pd P(CH2OH)3 4].cntdot.CH3, Inorg. Chem., 31, 3026, 1992. 

One of palladiums unique characteristics is its abihty to absorb 900 times its own volume of hydrogen gas. When the surface of the pure metal is exposed to hydrogen gas (H ), the gas molecules break into atomic hydrogen. These hydrogen atoms then seep into the holes in the crystal structure of the metal. The result is a metallic hydride (PdH that changes palladium from an electrical conductor to a semiconductor. The compound palladium dichloride (PdCl ) also has the ability to absorb large quantities of carbon monoxide (CO). These characteristics are useful for many commercial applications. Palladium is the most reactive of all the platinum family of elements (Ru, Rh, Pd, Os, Is, and Pt.)... 

For the unsubstituted compound 197a-Me the 2R/2S ratio was only 5.6 1 [ 10b, c], yet in this case the absolute configuration was checked by X-ray crystal structure analysis. The a-azidoesters 197-R were converted to the a,)3-diamino acids 198-R as described above, i.e. by catalytic hydrogenation over palladium on charcoal and hydrolysis of the ester group (Scheme 58) [10b, c, 62]. Saponification was not necessary for the benzyl esters 197a,b,i-Bn. 

Although lithiation remains the most frequently used metalation reaction, there have been a number of new reports of direct palladation of aryloxazolines. For example, Smoliakova and co-workers prepared the dimeric palladium complex 457 by direct reaction of Pd(OAc)2 with 2-phenyloxazoline in the presence of NaOAc/ HOAc (Scheme 8.150). ° The dimeric complex 457 was converted to the monomeric triphenylphosphine complex 458 for which the X-ray crystal structure was determined. A similar reaction sequence was observed for naphthalenes. Muller... 

---