Chloroplatinate anion

Chlorophenol. hydrogen bonding, with A-4-thiazoline-2-thione. 377 Chloroplatinate anion, 121... 

Uniform impregnation of ruthenium can be obtained with ruthenium chloride in the presence of citric acid the acid is competitive with the very strongly adsorbed complex ruthenium ion although as we saw earlier citric acid will completely displace the chloroplatinate anion. 

The adsorption of methanol takes place mostly on platinum free sites at potentials lower than 0.6 V and higher than 0.10 V. The mechanism for the spontaneous deposition on noble metals has not been clarified yet. Nevertheless, according to the literature, the simultaneous deposition of platinum and ruthenium from PtCI,2 and Ru(H20)3+ occurs first by a hydrogen adatom reduction of the ruthenium complex to metallic ruthenium, which subsequently reduces the chloroplatinate anion to the metallic platinum by the surface oxidation of the ruthenium to RuOJHy species [67]. Moreover, Hubbard [150] proposed a sequence for the case of the spontaneous deposition of tin from tin(II) species, auto disproportion leads to metallic tin and tin(IV) interface species followed by the subsequent surface oxidation of metallic tin to Sn(OH)2. 

Thus, our results oppose the popular opinion, that it is not ix>ssible to sorb simultaneously in comparable amounts chloroplatinate anion and dope cation on the surface of amphoteric and basic supports from the acid impregnating solutions at the synthesis of bimetal catalysts. Note, however, that a noticeable suppression of copper sorption by Pt limits the catalyst synthesis via a simultaneous deposition from the solutions with the known Pt content and Cu/Pt ratio. Our experiment results show, that only for Pt concentrations less than 0.5 wt.% we can obtain a wide range of Cu/Pt ratios. At the Pt concentration exceeding 1 wt.%, the obtained ratio shall be less than 2. Moreover, the registered acceleration of Pt... 

Hydrated tris(phenylbiguanide)cobalt(III) chloride forms needle-shaped, red crystals which are soluble in water and alcohol but insoluble in ether and acetone. When heated to 110° for 15 hours, the hydrate loses the whole of its water to form the red anhydrous salt. The solution of the complex chloride gives colored precipitates with a number of complex anions such as hexacyanoferrate(II), hexacyano-ferrate(III), nitroprusside, hexacyanocobaltate(III), and chloroplatinate. 

The required conditions for adsorption on alumina are anionic precursors at a pH lower than eight or cationic precursors at a pH higher than eight. Adsorption of chloroplatinic acid fails into the first category and can take place even in an acidic medium. 3 Interaction of alumina with Pt(NH3)4(OH)2 and Pt(NH3)4Cl2 in ammonia fits in the second. A solution of sodium chloroplatinate is, however, not sufficiently acidic so the pH is higher than eight and anionic adsorption does not take place. ... 

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