Intercalation of (3-aminopropyl) triethoxysilane into Cerium (IV) Hydrogenphosphate and Ion Exchange Behavior of the Intercalated Complex.
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Intercalation of (3-aminopropyl) triethoxysilane, AMPS, into cerium (IV) hydrogenphosphate (CeP) was investigated by X-ray diffractometry, chemical and thermal analysis, <SUP>29</SUP>Si MAS NMR, and FTIR. AMPS intercalated up to 1.2 mol per phosphate accompanied by hydrolysis of the ethoxy groups and the interlayer spacing of the CeP enlarged from 1.1nm to 1.7nm. The <SUP>29</SUP>Si MAS NMR spectra revealed that the AMPS undergoes polymerization and AMPS octamer, [NH<SUB>2</SUB> (CH<SUB>2</SUB>) <SUB>3</SUB>SiO<SUB>1.5</SUB>-O (OH) Si (CH<SUB>2</SUB>) <SUB>3</SUB>NH<SUB>2</SUB>] <SUB>4</SUB>, is formed in the interlayer space of CeP. Infrared spectra showed that the aminopropyl group exists as an ammonium form. On the basis of the relation between the uptake of metal ions and the leached amount of AMPS, the intercalated AMPS octamers was found to be exchanged with divalent metal cations stoichiometrically. Selectivity for the divalent metal ions increases with the following order; Ca<SUP>2+</SUP>>Sr<SUB>2+</SUB>>Ba<SUP>2+</SUP>>Cu<SUB>2+</SUB>>Co<SUP>2+</SUP>>Ni<SUP>2+</SUP>. This order agrees with that of the octylamine-intercalated CeP.
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