On the relationship between the structures of solid Cu(II) complexes and the course of their thermal decomposition

Langfelderová, H.

doi:10.1016/0040-6031(85)85533-7

Thermochimica Acta

1985

DOI: 10.1016/0040-6031(85)85533-7

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On the relationship between the structures of solid Cu(II) complexes and the course of their thermal decomposition

H. Langfelderová

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1990

1997

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Cited by 2 publications

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The relationship between the structures of Cu(II) complexes and their chemical transformations

Langfelderová

Linkešová

Ambrovič

1990

Journal of Thermal Analysis

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The thermal dehydration of the compounds M~[MII(H20)6](SeO4)2, where M 1 = NH4, K, Rb, Cs and T1, and M II = Cu and Ni, was studied in order to correlate the course of the decomposition with the known crystal structures. It was found that the stoiehiometry of the reactions is the same as that established for the analogous sulphato compounds of Cu(II) and Ni(II), respectively. Because of the discrepancies between the room-temperature crystal structures and the observed decomposition stoiehiometries, high-temperature powder diffractograms were taken. These indicated structural changes of the copper(II) compounds during heating. The powder patterns for different structure changes were calculated and compared with the experimental ones. It was shown that during the heating two axial Cu-HzO bonds are shortened and two equatorial bonds are lengthened. The observed decomposition stoichiometry is compatible with the formation of four nearly equal Cu-H20 bonds. The activation energies (E*) and pre-exponential factors (log A) for the first dehydration reaction of the Cu(II) compounds display the following sequence of MI: TI > Rb > NH4 > K, and they are the higher, the shorter the split equatorial Cu(II) bonds. For the compounds of Ni(II) the sequence of E* and log A values is K > TI > NH4 > Rb > Cs. It was shown previously [1, 2] that the symmetry of the Cu(II) coordination polyhedron is one of the important factors influencing the stoichiometryand the kinetics of the thermal decomposition of coordination compounds with Cu(II) as central atom. The fact that compounds with rhombically deformed coordination polyhedra, such as M~[Cu(H20)6](SO4)2, exhibit decomposition stoichiometry which would correspond better to tetragonal John Wiley & Sons, Limited, Chichester Akaddmiai lO'ad6, Budapest

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The relationship between the structures of Cu(II) complexes and their chemical transformations

Langfelderová

Linkešová

Ambrovič

1990

Journal of Thermal Analysis

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Synthesis, characterization and thermal decomposition study of some nickelnitro derivatives

Bolibar¹,

Insausti²,

Lorente³

et al. 1997

J. Mater. Chem.

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On the relationship between the structures of solid Cu(II) complexes and the course of their thermal decomposition

Cited by 2 publications

References 14 publications

The relationship between the structures of Cu(II) complexes and their chemical transformations

The relationship between the structures of Cu(II) complexes and their chemical transformations

Synthesis, characterization and thermal decomposition study of some nickelnitro derivatives

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