Physico-chemical studies on the thermal decompositions of iron(III) phthalates |
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Authors: | P S Bassi B S Randhawa G K Bilaspuri |
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Institution: | (1) Chemistry Department, Guru Nanak Dev University, 143 005 Amritsar, India |
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Abstract: | The thermal decompositions of basic salts of iron(III)o-phthalate sesquihydrate, Fe(C8H4O4)(OH)·1.5H2O, iron(III)m-phthalate trihydrate, Fe(C8H4O4)(OH)·3H2O, and iron(III)p-phthalate monhydrate, Fe(C8H4O4)(OH)·H2O, have been investigated from ambient temperature up to 973 K in air using Mössbauer and infrared spectroscopy, derivatography (DTG-DTA-TG) and X-ray diffraction. The thermal decomposition proceeds without reduction to Iron(II) species in the cases of iron(III)o-phthalate and iron(III)p-phthalate, whereas iron(II) species have been detected in the case of basic iron(III)m-phthalate. -Fe2O3 is formed as the end-product. Increase in the particle size of the -Fe2O3 with increasing decomposition temperature has also been observed.
Zusammenfassung Die thermische Zersetzung basischer Salze von Eisen(III)-o-phthalat-Sesquihydrat, Fe(C8H4O4)(OH) · 1,5H2O, Eisen(III)-m-phthalat-Trihydrat, Fe(C8H4O4)(OH)·3H2O, und Eisen(III)-p-phthalat-Monohydrat, Fe(C8H4O4)(OH)·H2O, wurden im Temperaturbereich von Raumtemperatur bis 973 K in Luft mittels Mössbauer- und IR-Spektroskopie, Derivatographie (DTG-DTA-TG) und Röntgendiffraktometrie untersucht. Im Gegensatz zu basischem Eisen(III)-m-phthalat erfolgt bei den entsprechendeno- undp-Phthalatverbindungen im Verlaufe der Zersetzung keine Reduktion zu Eisen(II)-Species. -Fe2O3 wird als Endprodukt erhalten. Mit steigender Zersetzungstemperatur nimmt die Größe der -Fe2O3-Partikel zu.
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