Antimonyl ion

Since both Bi3+ and Sb3+ cations belong to the same group of the periodic table, the formation of antimonyl ion from antimony(III) ion upon sonication seemed to be similar to that as suggested in case of bismuth earlier, following the similar sequences of steps as under ... 

Yoshimura et al. [193] carried out microdeterminations of phosphate by gel-phase colorimetry with molybdenum blue. In this method phosphate reacted with molybdate in acidic conditions to produce 12-phosphomolybdate. The blue species of phosphomolybdate were reduced by ascorbic acid in the presence of antimonyl ions and adsorbed on to Sephadex G-25 gel beads. Attenuation at 836 and 416 nm (adsorption maximum and minimum wavelengths) was measured, and the difference was used to determine trace levels of phosphate. The effect of nitrate, sulfate, silicic acid, arsenate, aluminium, titanium, iron, manganese, copper, and humic acid on the determination were examined. 

Antimony has some definite cationic chemistry, but only in the trivalent state, the basic character of Sb205 being negligible. Cationic compounds of SbUI are mostly of the antimonyl ion, SbO+, although some of the Sb3+ ion, such as Sb SO, are known. Antimony salts readily form complexes with various acids in which the antimony forms the nucleus of an anion. 

Crystal structures are available for many (N)4Co-amino acid complexes (Table I). Many of the diastereomers (AS, AS) in the bis-en series have been resolved using classic crystallization (usually via bromocamphor sulfonate, arsenyl-, or antimonyl-tartrate salts) or ion exchange methods (Table II). Reversed-phase ion-pair HPLC, using aryl phosphate or aryl/alkyl sulfonate ion pairing reagents in MeOH/ H20 eluent, has allowed diastereomer separations to be carried out on analytical amounts (28) (Table II). 

Antimony(III) compounds are easily dissolved in acids, when the ion Sb3+ is stable. If the solution is made alkaline, or the concentration of hydrogen ions is decreased by dilution, hydrolysis occurs when antimonyl, SbO+, ions are formed ... 

An example of this unusual valence group (2,8) is found for Sb(ili) in antimonyl tartrates. In the potassium salt, KSbC4H407. H20, the bond arrangement around Sb appears to be close to (a), while in the ammonium salt it is closer to (b). The ion is shown at (c). 

Two primary resolving agents for metal complexes are D-tartrate and antimonyl D-tartrate ions. Optical resolution is achieved using either chromatography (e.g., ion exchange with D-tartrate salt as the eluent) or by fractional precipitation. We will use this latter technique for resolutions. When a racemic mixture of a metal complex is combined with an optically... 

The present work reports the circular dichroism specua and the unpolarized light absorption of the tris-2,2 -dipyridyl and the tris-1,10-phenanthroline complexes of Ni(II), Fe(II), Ru(II), Os(II), Ru(III) and Os(III), The particular enantiomers studied were those forming the less soluble (-)-Co(ox)p salt and the less soluble antimonyl-(+)-tartrate On solubility grounds these enantiomers are expected to have the same absolute configuration as (+)-Co(en , since the latter complex ion preferentially precipitates the (-)-isomer from a solution of racemic K Co(ox). ... 

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