Chiral Germanium Zeotype with Interconnected 8-, 11-, and 11-Ring Channels. Catalytic Properties
详细信息 查看全文
- 作者：M. E. Medina ; M. Iglesias ; N. Snejko ; E. Gutié ; rrez-Puebla ; and M. A. Monge
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：February 24, 2004
- 年：2004
- 卷：16
- 期：4
- 页码：594 - 599
- 全文大小：235K
- 年卷期：v.16,no.4(February 24, 2004)
- ISSN：1520-5002
文摘
The synthesis, structure, thermal stability, and catalytic properties are reported for a chiralgermanate, Ge9O19(OH)2(N2C2H10)2(N2C2H8)0.5H2O, ICMM6. It is orthorhombic, of space groupC2221, and has unit cell dimensions a = 12.156(3) Å, b = 13.960(4) Å, c = 14.258(4) Å, volume2419.6(11) Å3, and Z = 4. Three kinds of interconnected helical 8-, 11-, and 11-rings channelsare present in the 3D framework. ICMM6 is an active chiral catalyst for the Michael additionreaction and acetalization of aldehydes. It is stable in water and organic solvents and canbe recovered and reused at least four times without losing either its structure or its reactivity.