Preparation and Characterization of Cu(II) Phthalocyanine Tetrasulfonate Intercalated and Supported on Layered Double Hydroxides |
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Authors: | César AS Barbosa Ana Maria DC Ferreira Vera R L Constantino Antonio Carlos V Coelho |
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Institution: | (1) Instituto de Química, Universidade de São Paulo, Caixa Postal 26 077, CEP 05513-970 São Paulo, SP, Brazil;(2) Departamento de Engenharia Química da Escola Politécnica, Universidade de São Paulo, Caixa Postal 61548, CEP 05424-790 São Paulo, SP, Brazil |
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Abstract: | The aim of the present work was to synthesize and characterize layered doublehydroxides (LDHs), in the magnesium/aluminum form, intercalated with copper(II)phthalocyanine tetrasulfonate (CuPcTs). The metal complex was immobilized intothe LDH gallery region through the reconstitution method and this material wascharacterized by X-ray diffraction (XRD), surface area and porosity measurements,elementary analysis, thermogravimetry (TGA), vibrational (IR) and electronic(UV-visible) spectroscopies, and electronic paramagnetic resonance (EPR). Thecatalytic performance of CuPcTs intercalated and supported on the LDH wasevaluated by carrying out the hydrogen peroxide dismutation. The CuPcTs wassuccessfully intercalated into the LDH layers according to XRD data (the basalspacing of the carbonate precursors increases by approximately 15Å inthe intercalated samples). The surface area and porosity analysis suggested thatthe CuPcTs intercalated materials are not microporous solids. Samples containingthe metal complex confined between the LDH layers have an appreciable thermalstability: decomposition is not observed at least up to 400 °C. TGA experiments also show that the weight-loss curves of the CuPcTs supported samples superimpose those recorded for the CuPcTs complex and the LDH-carbonate while the curves for theintercalated materials are unique. CuPcTs intercalated or supported on LDHs is notactive in the hydrogen peroxide dismutation although the free form shows activity at pH above 8. |
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Keywords: | layered double hydroxides anionic clays hydrotalcite-like compounds Cu(II) phthalocyanine tetrasulfonate solid state inclusion chemistry thermal decomposition hydrogen peroxide dismutation |
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