Some Polynuclear Coordination Compounds Precursors of Chromites Synthesis,Physicochemical Characterization and Thermal Stability |
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| Authors: | Pocol V Patron L Carp O Brezeanu M Segal E Stanica N Crisan D |
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| Institution: | (1) Institute of Physical Chemistry, Splaiul Independentei, Bucharest;(2) Department of Inorganic Chemistry, Faculty of Chemistry, University of Bucharest, Dumbrava Rosie Street, Bucharest;(3) Department of Physical Chemistry, Faculty of Chemistry, University Bucharest, Bulevardul Carol Republicii, Bucharest, Romania |
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| Abstract: | The polynuclear coordination compounds LnCr(tartrate)3·nH2O where Ln(III)=La-Er, obtained through a precipitation method, were characterized on the basis of elemental analysis, their
electronic and vibrational spectra and magnetic susceptibility measurements. The possibility of obtaining chromites through
the transformations of the polynuclear coordination compounds in the solid state was considered. The thermal decompositions
of these compounds, studied by TG and DTA methods, were found to follow an almost uniform pattern. The decompositions occurred
in six-eight steps. The first two steps involved dehydration, and the third the transformation of tartrate anions to oxalate,
followed by conversion to carbonate and oxocarbonate intermediates. The final product in each case was LnCrO3. A non-isothermal kinetic analysis of the first decomposition steps was performed, the most probable decomposition mechanism
being selected and the kinetic parameters evaluated. The final products of the transformations were characterized.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | chromites polynuclear coordination compounds precursors |
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