Development of novel pillared clays for the encapsulation of inorganic complexes

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Pires, J (Autor) Outra; Francisco, J (Autor) Outra; Carvalho, A (Autor) Outra; de Carvalho, MB (Autor) Outra; Silva, AR (Autor) Outra; Freire, C (Autor) FCUP; de Castro, B (Autor) FCUP

Revista

Título: Langmuir

Vol. 20

Páginas: 2861-2866

ISSN: 0743-7463

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 18 Citações

Scopus - 17 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-000-B55

DOI: 10.1021/la0357209

Abstract (EN): Several pillared clays were prepared by using a polyalcohol (ethylene glycol or poly(vinyl alcohol)) or a poly(ethylene oxide) surfactant as an interlayer gallery template and an aluminum oligomer species as the pillaring agent. The use of polyalcohols or nonionic surfactants, such as Tergitol, gave materials which, in general, presented larger basal spacing than those found for the solids prepared by a similar procedure but without additives. The initial positive effect in the expansion of the clay interlayers was not totally retained after calcination of the materials; most probably, at the end, the basal spacing is still ruled by the intercalating aluminum species. The pillared clay with the largest basal spacing and specific surface area was used to encapsulate copper(II) complexes with pentadentate N3O2 Schiff base ligands derived from copper(II) acetylacetonate by in situ synthesis. The characterization made (X-ray diffraction, X-ray photoelectron spectroscopy, FTIR spectroscopy, chemical analysis, and low-temperature N-2 adsorption) provided evidence that copper(II) complexes with pentadentate N3O2 Schiff base ligands were efficiently entrapped within the lower dimension pores of the pillared clay and that they interact strongly with the pillared clay matrix.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6