Use of a Cu2+ probe to characterise silica‐pillaring in zirconium phosphate by electron paramagnetic resonance spectroscopy

Autor:	Fouzia Khattou, Guillaume Aptel, Deborah J. Jones, Jean-Victor Zanchetta, B. Deroide, Jacques Rozière
Rok vydání:	1999
Předmět:	Crystal chemistry Inorganic chemistry chemistry.chemical_element Protonation General Chemistry Nitrogen Copper Oxygen law.invention chemistry.chemical_compound Zirconium phosphate chemistry law Materials Chemistry Lamellar structure Electron paramagnetic resonance
Zdroj:	Journal of Materials Chemistry. 9:2453-2458
ISSN:	1364-5501 0959-9428
DOI:	10.1039/a904427b
Popis:	Copper has been used as an electron paramagnetic resonance (EPR) probe for the interlayer environment ofα-zirconium phosphate (α-ZrP) intercalated from hydrolysed/condensed 3-(2-aminoethylamino)propyl-trimethoxysilane solutions. These solids are precursors to porous silica-pillared solids. The EPR spectra of the Cu 2+ –aminosiloxane pillaring solution and of the intercalated solid prepared using this solution are identical. More detailed study of the solution has shown the existence of two types of EPR spectra, when the molar ratio Si/Cu ≥ 2 and when Si/Cu < 2. For the former, Cu 2+ has an environment of nitrogen and oxygen (4 + 2); at lower Si/Cu ratios, the EPR spectra are characteristic of an oxygen atom environment. On acidification of the aminosiloxane solution, nitrogen coordination to Cu 2+ is progressively replaced by oxygen, as the amino groups become protonated.
Databáze:	OpenAIRE
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