New Layered Rare-Earth Hydroxides with Anion-Exchange Properties

✍ Scribed by Fengxia Geng; Hao Xin; Yoshitaka Matsushita; Renzhi Ma; Masahiko Tanaka; Fujio Izumi; Nobuo Iyi; Takayoshi Sasaki

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 589 KB
• Volume: 14
• Category: Article
• ISSN: 0947-6539
• DOI: 10.1002/chem.200800127

✦ Synopsis

Abstract

We report the synthesis of a new series of layered hydroxides based on rare‐earth elements with a composition of RE(OH)~2.5~Cl~0.5~⋅0.8 H~2~O (RE: Eu, Tb, etc.) through the homogeneous precipitation of RECl~3~⋅x H~2~O with hexamethylenetetramine (HMT). Rietveld analysis combined with direct methods revealed an orthorhombic layered structure comprising a positively charged layer of [RE(OH)~2.5~(H~2~O)~0.8~]^0.5+^ and interlayer Cl^−^ ions. The Cl^−^ ions were readily exchangeable for various anions (NO~3~^−^, SO~4~^2−^, dodecylsulfonate, etc.) at ambient temperature. Photoluminescence studies showed that the compounds display typical RE^3+^ emission. With rare‐earth‐based host layers and tunable interlayer guests, the new compounds may be of interest for optoelectronic, magnetic, catalytic, and biomedical materials.