Abstract
The thermal dehydration of the 8-quinolinol chelate hydrates of Ni(II), Co(II), Cu(II), Cd(II), Mn(II), Mg(II), and Zn(II) was studied by thermogravimetry, differential scanning calorimetry, h.t.r.s. and d.r.s. Calorimetric data indicated that the heats of dehydration were correlatable with crystal field and electrostatic theory. The thermogravimetric data, applied in a different type of solid state kinetics equation, indicated that there was a difference in type of water bonding between that in the magnesium(II) complex and the other complexes. Changes in reflectance spectra upon dehydration were ascribed to possible changes in coordination for the complexes of Co(II), Cu(II), and Ni(II), involving the d-orbital splittings, and to changes in coordination affecting charge transfer in the complexes of Mg(II), Zn(II), and Cd(II).
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