CXCVI.—The action of halogens on silver salts and on potassium cyanate in presence of water, with a note on the decomposition of cyanic acid in aqueous solution

1912 ◽  
Vol 101 (0) ◽  
pp. 1852-1866 ◽  
Author(s):  
Charles William Blyth Normand ◽  
Alexander Charles Cumming
Keyword(s):  
Aqueous Solution ◽  
Cyanic Acid ◽  
Silver Salts

Reactions of cis-[Pt(sulfoxide)2Cl2] with silver salts and synthesis of hydroxo-bridged platinum(II) complexes with sulfoxides

1986 ◽  
Vol 64 (9) ◽  
pp. 1897-1902 ◽  
Author(s):  
Fernande D. Rochon ◽  
Pi-Chang Kong ◽  
Louise Girard
Keyword(s):  
Aqueous Solution ◽  
Infrared Spectroscopy ◽  
Silver Salt ◽  
H Nmr ◽  
Silver Salts

Platinum(II) compounds of the type cis-[Pt(L)2X2] where L = tetramethylenesulfoxide (TMSO), ethylmethylsulfoxide (EMSO), di-n-propylsulfoxide (DPSO), benzylmethylsulfoxide (BMSO), and dibenzylsulfoxide (DBSO) and X = Cl− and I− have been synthesized. The reactions of these compounds with a silver salt were studied in aqueous solution. Monomers of the type cis-[Pt(L)2(ClO4)2] (L = TMSO, EMSO, and DBSO), cis-[Pt(EMSO)2(SO4)] and hydroxy-bridged oligomers were isolated. Dimers, cis-[Pt(L)2(OH)]2(NO3)2 (L = TMSO, DPSO), and cis-[Pt(EMSO)2(OH)]2SO4 and possibly a trimer (cis-[Pt(EMSO)2(OH)]3)2(SO4)3 were characterized. The compounds were studied by infrared spectroscopy and by 1H nmr.

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

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