Complex formation between Fe(II) and inorganic anions. Part 1.—Effect of simple and complex halide ions on the Fe(II)+H2O2reaction

1967 ◽  
Vol 63 (0) ◽  
pp. 620-629 ◽  
Author(s):  
C. F. Wells ◽  
M. A. Salam
Keyword(s):  
Complex Formation ◽  
Inorganic Anions ◽  
Halide Ions

Complex formation between sulfur dioxide and halide ions

1977 ◽  
Vol 55 (15) ◽  
pp. 2807-2812 ◽  
Author(s):  
Etela Milanova ◽  
Robert L. Benoit
Keyword(s):  
Sulfur Dioxide ◽  
Complex Formation ◽  
Enthalpy Of Solution ◽  
Halide Ions ◽  
Iodide Ions ◽  
Enthalpy Changes ◽  
Stability Order ◽  
The Difference ◽  
The Stability ◽  
Dipolar Aprotic Solvents

Complex formation between sulfur dioxide and iodide ions in acetonitrile (AN) has been studied by vapour pressure measurements. The enthalpy changes ΔH0 for 1:1 association reactions between SO2 and halide (X−) ions in AN and between SO2 and Cl− in dimethylsulfoxide (DMSO) have been determined at 25 °C by calorimetry. The ΔH0 values (kcal mol−1) are respectively −4.1 (Cl−), −3.4 (Br−), −3.0 (I−) in AN and −0.7 (Cl−) in DMSO. In contrast to previous literature data there is a linear relationship between these ΔH0 and reported ΔG0 values for the formation of the SO2X− complexes in AN. The difference between the ΔH0 values for SO2Cl− in the solvents AN and DMSO is accounted for by the more exothermic enthalpy of solution of SO2 in DMSO which is the more basic solvent, and by the expected minor difference in the enthalpies of transfer of Cl− and SO2Cl− from AN to DMSO, both dipolar aprotic solvents. Some of the problems connected with the stability order of the SO2X− complexes are discussed in relation to solvent effects and properties of X−.

Electronic Spectra and Stability of Cobalt Halide Complexes in Molten Calcium Nitrate Tetrahydrate

2004 ◽  
Vol 59 (9) ◽  
pp. 602-608 ◽  
Author(s):  
István J. Zsigrai ◽  
Slobodan B. Gadzuric ◽  
Ruzica Nikolic ◽  
László Nagy
Keyword(s):  
Complex Formation ◽  
Absorption Maximum ◽  
Nitrate Solution ◽  
Calcium Nitrate ◽  
Calcium Nitrate Tetrahydrate ◽  
Halide Ions ◽  
Absorption Intensity ◽  
Nitrate Tetrahydrate ◽  
Different Temperatures ◽  
Halide Complexes

The complex formation between cobalt(II) and chloride and bromide ions in molten calcium nitrate tetrahydrate at different temperatures has been studied by a spectrophotometric technique. Addition of halide ions to cobalt(II) nitrate solution in calcium nitrate tetrahydrate caused a pronounced shift of the absorption maximum toward lower energies and a large increase of absorption intensity, indicating a change from octahedral to a tetrahedral co-ordination. The change of co-ordination depends on temperature and halide concentration. Stability constants for the [Co(NO3)4]2−, [Co(NO3)2X2]2− and [CoX4]2− complexes at 40 and 70 ◦C and the corresponding species spectra are reported.

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