New Layered Rare-Earth Hydroxides with Anion-Exchange Properties

作者：Geng Fengxia; Xin Hao; Matsushita Yoshitaka; Ma Renzhi; Tanaka Masahiko; Izumi Fujio; Iyi Nobuo; Sasaki Takayoshi^*

来源：Chemistry - A European Journal, 2008, 14(30): 9255-9260.

DOI：10.1002/chem.200800127

• anions
• ion exchange
• layered compounds
• luminescence
• rare-earth elements

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 center dot 0.8H(2)O (RE: Eu, Tb, etc.) through the homogeneous precipitation of RECl3 center dot xH(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)(H2O)(0.8)](0-5+) and interlayer Cl- ions. The Cl- ions were readily exchangeable for various anions (NO3-, SO42-, dodecylsulfonate, etc.) at ambient temperature. Photoluminescence studies showed that the compounds display typical RE 31 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.

• 出版日期2008