HIGH ENERGY MODIFICATIONS OF THE HYDRATES OF ZINC SULFATE

1965 ◽  
Vol 43 (12) ◽  
pp. 3129-3132 ◽  
Author(s):  
J. W. S. Jamieson ◽  
R. A. Lamontagne ◽  
Barbara A. Pattern ◽  
G. R. Brown
Keyword(s):  
Zinc Sulfate ◽  
High Energy ◽  
Crystalline Form ◽  
Ligand Field ◽  
Field Splitting ◽  
Maximum Heat ◽  
Heats Of Solution ◽  
Splitting Energy ◽  
Heat Of Transition ◽  
Vacuum Dehydration

Much higher heats of solution than have previously been observed for hydrates of zinc sulfate have been measured for various new vacuum dehydration products. It is suggested that the maximum heat of transition to normal crystalline form of 82.8 cal/g, 23.8 kcal per mole of heptahydrate, or 8.3 × 103 cm−1 is a satisfactory measure of the ligand field splitting energy for the hexaaquozinc(II) ion.

POSSIBLE CALORIMETRIC METHOD FOR MEASUREMENT OF THE LIGAND FIELD SPLITTING ENERGIES FOR THE HEXAAQUO CATIONS OF SOME TRANSITION ELEMENTS

1965 ◽  
Vol 43 (8) ◽  
pp. 2148-2156 ◽  
Author(s):  
J. W. S. Jamieson ◽  
G. R. Brown ◽  
D. W. Gruener ◽  
R. V. Peiluck ◽  
R. A. LaMontagne
Keyword(s):  
Divalent Cations ◽  
High Energy ◽  
Ligand Field ◽  
Transition Elements ◽  
Theoretical Justification ◽  
Field Splitting ◽  
Iron Cobalt ◽  
Heats Of Solution ◽  
Vacuum Dehydration ◽  
Cobalt And Nickel

High energy modifications of the lower hydrates of the divalent sulfates of manganese, iron, cobalt, and nickel have been prepared by vacuum dehydration. The heats of solution of these materials have been measured and compared with the heats of solution of the normal crystalline lower hydrates. The maximum heats of transition appear to be proportional to the ligand field splitting energies for the corresponding hexaaquo divalent cations, although theoretical justification for this correlation is not yet obvious.

Ligand field splitting energies of the hexaamminecobalt(II) ion and the hexaamminenickel(II) ion measured by a calorimetric method

1970 ◽  
Vol 48 (14) ◽  
pp. 2177-2181 ◽  
Author(s):  
Badri Muhammad ◽  
J. W. S. Jamieson
Keyword(s):  
Close Agreement ◽  
High Energy ◽  
Calorimetric Method ◽  
Ligand Field ◽  
Maximum Difference ◽  
Kcal Mole ◽  
Heat Of Solution ◽  
Field Splitting ◽  
Heats Of Solution ◽  
Splitting Energy

Various normal lower ammines and high-energy modifications of the lower ammines of cobalt(II) sulfate and nickel(II) sulfate have been prepared and the heats of solution in dilute ammonia have been measured for both types. For each of these ammine systems the maximum difference in heat of solution, expressed as kcal/mole of each heptaammine, between the high-energy and the normal salts has been found to be in close agreement with the ligand field splitting energy of the hexaamminemetal(II) ion.

Thermochemical measurement of the ligand field splitting energies for hexaammine complexes of Mn(II), Fe(II), and Zn(II)

1977 ◽  
Vol 55 (20) ◽  
pp. 3530-3535
Author(s):  
M. Badri ◽  
J. W. S. Jamieson
Keyword(s):  
Metal Ion ◽  
High Energy ◽  
Ligand Field ◽  
Maximum Difference ◽  
Heat Of Solution ◽  
Field Splitting ◽  
Order Of Magnitude ◽  
Splitting Energy ◽  
The Right ◽  
Right Order

Various lower ammines and high-energy modifications of lower ammines of the sulphates of Mn(II), Fe(II), and Zn(II) have been prepared and their heats of solution have been measured. For each of these ammine systems, the maximum difference in heat of solution, expressed in kcal/mol of heptaammine, has been found to be of the right order of magnitude to be regarded as the ligand field splitting energy for the hexaammine complex of the metal ion.

scholarly journals Thermochemical measurement of the ligand field splitting energies for hexaaquocopper(II) and hexaamminecopper(II)ions

1979 ◽  
Vol 57 (15) ◽  
pp. 1926-1931 ◽  
Author(s):  
Muhammad Badri ◽  
James W. S. Jamieson
Keyword(s):  
Spectroscopic Method ◽  
Energy Difference ◽  
High Energy ◽  
Maximum Energy ◽  
Ligand Field ◽  
Heat Of Solution ◽  
Ammine Complexes ◽  
Field Splitting ◽  
Order Of Magnitude ◽  
The Right

The vacuum dehydration of copper(II) sulphate pentahydrate has been shown to pass through the transitory trihydrate state before proceeding to the monohydrate composition. Based on this, the heat of solution data for the high-energy modification hydrates have been reinterpreted and the low-energy crystalline hydrates of various compositions have been prepared and their heats of solution measured. From the heat of solution data the maximum energy difference expressed in kcal/mol heptahydrate appears to be of the right order of magnitude to be regarded as the ligand field splitting energy for the hexaaquocopper(II) ion. Similar measurement for the ammine complexes of copper(II) sulphate has also been done and the maximum energy difference was found to agree well with the value of LFSE obtained by spectroscopic method.

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