Covalent Bonding of Crown Ethers to γ-Zirconium Phosphate—New Layered Ion Exchangers Showing Selective Recognition
✍ Scribed by Prof. Ernesto Brunet; Manuel Huelva; Raquel Vázquez; Prof. Olga Juanes; Prof. Juan C. Rodríguez-Ubis
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 708 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0947-6539
No coin nor oath required. For personal study only.
✦ Synopsis
The topotactic exchange reactions of y-zirconium phosphate and y-zirconium phosphate/methylphosphonate with phosphonic acids derived from azacrown ethers of different sizes was examined. Prior intercalation of hexylamine was necessary in most cases to attain the maximum exchange level predicted by molecular modeling. Materials with imbricated or nonimbricated layers were obtained depending on crown size and exchange level. Exchange of methylphos-phonates in y-zirconium phosphate/methylphosphonate was only observed when hexylamine had previously been intercalated. The exchange with the bisphosphonic acid derived from l,lO-diaza[l8]crown-6 gave a material with an interlayer