title: Development of novel pillared clays for the encapsulation of inorganic complexes.
abstract: 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 N2 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.
authors.affiliation: Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Campo Grande, 1749-016 Lisboa, Portugal.
authors.forename: João
authors.initials: J
authors.lastname: Pires
authors.forename: Joana
authors.initials: J
authors.lastname: Francisco
authors.forename: Ana
authors.initials: A
authors.lastname: Carvalho
authors.forename: M Brotas
authors.initials: MB
authors.lastname: de Carvalho
authors.forename: Ana Rosa
authors.initials: AR
authors.lastname: Silva
authors.forename: Cristina
authors.initials: C
authors.lastname: Freire
authors.forename: Baltazar
authors.initials: B
authors.lastname: de Castro
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000138:chemical synthesis* / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis*; D011092:Polyethylene Glycols / Q000737:chemistry; D011142:Polyvinyl Alcohol / Q000737:chemistry; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D009942:Organometallic Compounds; D013501:Surface-Active Agents; D011092:Polyethylene Glycols; D003300:Copper; D011142:Polyvinyl Alcohol; D009584:Nitrogen