The kinetics of racemization of optically active complex ions of group 8 elements. I. The tris(1:10-phenanthroline) nickel complex ion

1952 ◽  
Vol 48 ◽  
pp. 244 ◽  
Author(s):  
N. R. Davies ◽  
F. P. Dwyer
Keyword(s):  
Nickel Complex ◽  
Optically Active ◽  
Complex Ions ◽  
Active Complex ◽  
Kinetics Of ◽  
Complex Ion

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.

COMPLEX MANGANESE PERIODATES

1960 ◽  
Vol 38 (8) ◽  
pp. 1291-1299 ◽  
Author(s):  
M. W. Lister ◽  
Y. Yoshino
Keyword(s):  
Unpaired Electron ◽  
Magnetic Moment ◽  
Absorption Maximum ◽  
Ferrous Ions ◽  
Complex Ions ◽  
Acid Base ◽  
Iodide Ions ◽  
Reaction Proceeds ◽  
Kinetics Of ◽  
Complex Ion

The preparation of complex periodatomanganates, from manganous salts reacting with sodium (or potassium) hypochlorite and periodate, is described. The products were Na7H4Mn(IO6)3.17H2O and K7H4Mn(IO6)3.8H2O. The manganese was shown to be tetravalent from its redox equivalent in its reaction with iodide and with ferrous ions, and from its magnetic moment, which was 3.87 Bohr magnetons, corresponding to three unpaired electron spins. The ion has an absorption maximum at 483 mμ. Rather complicated pH curves were found for this compound in acid-base titrations. The complex ion decomposes slowly to permanganate and iodate; the kinetics of this reaction have been measured, and a possible mechanism has been suggested. The reaction proceeds in several steps by way of simpler complex ions. The same applies to the reaction between iodide ions and the complex ions when the pH is about 9.

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.

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