The kinetics of racemization of optically active complex ions of group 8 elements. Part 3.—tris-1: 10-Phenanthroline and tris-2: 2′-dipyridyl nickel ions in solutions of other optically active ions

1954 ◽  
Vol 50 (0) ◽  
pp. 24-28 ◽  
Author(s):  
N. R. Davies ◽  
F. P. Dwyer
Keyword(s):  
Optically Active ◽  
Complex Ions ◽  
Nickel Ions ◽  
Active Complex ◽  
Kinetics Of

Studies of cobalt(III) complexes of thiosemicarbazide

1970 ◽  
Vol 48 (15) ◽  
pp. 2327-2333 ◽  
Author(s):  
Kenneth K. W. Sun ◽  
Roland A. Haines
Keyword(s):  
Optically Active ◽  
Optical Rotatory Dispersion ◽  
Bond Rupture ◽  
Ionic Form ◽  
Optical Rotatory ◽  
Geometric Isomers ◽  
Complex Ions ◽  
Active Complex ◽  
Cis And Trans ◽  
Rupture Mechanism

cis and trans geometric isomers of low spin octahedral cobalt(III) complexes containing either thiosemicarbazide (Htsc) or its anion (tsc) have been prepared and electronic spectra are presented and discussed. For the ionic form [Co(Htsc)3]3+ both isomers were resolved and absolute configurations were assigned on the basis of optical rotatory dispersion and circular dichroism measurements. The interconversion of these optically active complex ions in aqueous solution was studied and a bond rupture mechanism is proposed to account for the observed inversion and isomerization.

The mechanisms and steric course of substitution at a divalent ruthenium centre

1966 ◽  
Vol 19 (12) ◽  
pp. 2235 ◽  
Author(s):  
B Bosnich ◽  
FP Dwyer
Keyword(s):  
Absolute Configuration ◽  
Complex Cation ◽  
Optically Active ◽  
The Other ◽  
Active Complex ◽  
Pyridine Group ◽  
Kinetics Of

The thermal rates of substitution of one pyridine group coordinated to the optically active complex cation cis-[Ru phen2 py2]2+ (phen = o- phenanthroline, py = pyridine) dissolved in dry acetone have been measured using the anions Cl-, Br-, I-, NCS-, N-3, and NO-2. It was found that for all anions monosubstitution proceeded with complete retention of absolute configuration. The anions Cl-, Br-, I-, and NCS- substituted at a rate which was independent of their nature and concentration. The kinetics of substitution of the anions N-3 and NO-2 have not been fully resolved, but the rates of reaction of these two anions appear to be faster than the other four.

Modeling of sorption kinetics of U(VI) micro-quantities nanostructured materials with anatase mesoporous structures

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Veniamin Zheleznov ◽  
Aleksey Golikov ◽  
Tatiana Sokolnitskaya ◽  
Sergey Ivannikov
Keyword(s):  
Nanostructured Materials ◽  
Sorption Kinetics ◽  
Uranyl Ion ◽  
Competitive Sorption ◽  
Hydroxyl Groups ◽  
Complex Ions ◽  
The Stability ◽  
Kinetics Of ◽  
Mesoporous Structures ◽  
Ionic Forms

Abstract The sorption kinetics of uranyl ions micro-quantities from fluoride solutions by nanostructured materials with anatase mesoporous structures has been studied. Using the model of competitive sorption of ions and positively charged complexes of uranyl ion on deprotonated hydroxyl groups of an anatase, kinetic curves of changes in the ratio of ionic forms of uranium in solution were calculated. Modeling was carried out under the assumption of a two-stage mechanism of uranium complex ions sorption. The modeling considered the influence of the uranyl ion carbonate complexes formation. The shift in equilibrium among ionic forms of uranyl correlates with the stability of the complexes in solution.

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