The First VOPO4·2H2O Intercalation Compound Synthesized through a Solid-State Reaction at Room Temperature |
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Authors: | Robson F de Farias Claudio Airoldi |
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Institution: | a Departamento de Qu?́mica, Universidade Federal de Roraima, CP 167, 69301-270, Boa Vista, Roraima, Brazilb Instituto de Qu?́mica, Universidade Estadual de Campinas, CP 6154, 13083-970, Campinas, São Paulo, Brazil |
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Abstract: | This communication reports the first intercalation into VOPO4·2H2O performed through a solid-state reaction at room temperature. Ethyleneurea, EU (2-imidazolidone) was intercalated into the oxovanadium phosphate by grinding in a mortar stoichiometric amounts of both reagents at room temperature for 30 min. C, H and N elemental analyses of the obtained intercalation compound gave the formula VOPO4·(EU)·H2O. The profile of the absorption bands due to the VOPO4 lattice vibration around 1000 cm−1 was retained after reaction, providing evidence that an intercalation compound and not merely a salt of V-P-O species was produced. For α-VOPO4·2H2O, the interlayer distance is 0.75 nm, whereas for the EU inter-calation compound it is 0.95 nm. The obtained SEM micrographs show that the microstructure of VOPO4·2H2O is changed after reaction, with a total exfoliation of the oxovanadium matrix. |
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