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Preparation and reactivity of metal-containing monomers

41. The formation and thermal transformations of nanometer-sized particles of cobalt ferrite upon the decomposition of coprecipitated FeIII and CoII acrylates

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Abstract

Thermal transformations (at 340 to 390 °C) of coprecipitates of iron and cobalt acrylates, [Fe3O(CH2CHCOO)6OH][Co(CH2CHCOO)2]2.4 (1) and [Fe3O(CH2CHCOO)6OH][Co(CH2CHCOO)2]1.5·3H2O (2), are studied. The dependence of the degree of gas evolution (η) on time is described by the equation (ŋ) wherek 1=2.3 · 1012 · exp[−49500/(RT)] s−1,k 2=6.0 · 106 · exp[−33000/(RT)] s−1 andk 1=2.6 · 1012 · exp[−49000/(RT)] s−1,k 2=6.6 · 105 · exp[−30000/(RT)] s−1 for cocrystallizates1 and2, respectively. The coefficient ŋ1∞ decreases as the temperature increases. The value of ŋ1∞ for compound1 is higher than that for compound2. The composition of products of the transformations of1 and2 are studied. The main solid state products of the decomposition are nanometer-sized particles of cobalt ferrite, CoFe2O4, with a narrow size distribution stabilized by the polymeric matrix. The thermal transformations of cocrystallizates1 and2 include dehydration, thermal decomposition, copolymerization in the solid state, and decarboxylation of the metallocarboxylate groups of the polymer. The effect of the ratio between the Fe clusters and the Co-containing fragments on the process of thermal transformation is analyzed.

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Authors and Affiliations

  1. Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences, 142432, Chemogolovka, Moscow Region, Russian Federation

    A. S. Rozenberg, E. I. Aleksandrova, G. I. Dzhardimalieva, N. V. Kir'yakov, P. E. Chizhov, V. I. Petinov & A. D. Pomogailo

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  1. A. S. Rozenberg
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  2. E. I. Aleksandrova
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  3. G. I. Dzhardimalieva
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  4. N. V. Kir'yakov
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  5. P. E. Chizhov
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  6. V. I. Petinov
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  7. A. D. Pomogailo
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Additional information

For Part 40, seeRuss. Chem. Bull., 1994,43, 2020.

Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 885–893, May, 1995.

The authors are grateful to A. N. Titkov for optical microscopic and electron microscopic studies.

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Rozenberg, A.S., Aleksandrova, E.I., Dzhardimalieva, G.I. et al. Preparation and reactivity of metal-containing monomers. Russ Chem Bull 44, 858–866 (1995). https://doi.org/10.1007/BF00696917

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  • DOI: https://doi.org/10.1007/BF00696917

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