resumo
The synthesis of inorganic/organic hybrid compounds by solid-solid reactions of the hydrated wheteropolyacids H-3[PM12O40]center dot nH(2)O (M = Mo, W) with selected substituted pyridines having different sizes and functionalities is described. Several new compounds were prepared at room temperature and characterised by infrared and UV-Vis absorption spectroscopies, powder X-ray diffraction and analytical techniques. Related materials prepared by precipitation from solution were also studied and the comparison was made between results obtained with the different preparative procedures. This is the first systematic account on the acid-base reaction of solid heteropolyacids and solid pyridine derivatives, without the addition of any solvent. The obtained results indicate that the obtained crystalline powders may present physical properties different from related materials prepared by precipitation from solution. (C) 2016 Elsevier B.V. All rights reserved.
palavras-chave
STATE CHEMICAL-REACTION; 4-PHENYLPYRIDINIUM HYDROGEN SQUARATE; ORGANIC-INORGANIC HYBRIDS; SOLID-STATE; POLYOXOMETALATE MATERIALS; HETEROGENEOUS CATALYSIS; VIBRATIONAL-SPECTRA; CRYSTAL-STRUCTURE; ROOM-TEMPERATURE; SINGLE-CRYSTAL
categoria
Chemistry
autores
Santos, FM; Nogueira, HIS; Cavaleiro, AMV; Gomes, ED; Belsley, MS
nossos autores
Ana Maria Vieira Silva Viana Cavaleiro
Professor Catedrático
Filipe Miguel de Almeida Marques dos Santos
Bolseiro de pós-Doutoramento
Helena Isabel Seguro Nogueira
Professor Auxiliar com AgregaçãoProjectos
agradecimentos
The authors wish to thank to the University of Aveiro, CICECO, FCT and FEDER (POCTI/CTM/37713/2001) for financial support of this work. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.