Synthesis and single crystal structure of an AFX-type magnesium aluminophosphate

✍ Scribed by Pingyun Feng; Xianhui Bu; Chung-Sung Yang

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 221 KB
• Volume: 50
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(01)00441-3

✦ Synopsis

SAPO-56 (framework type: AFX) has a framework topology slightly dierent from that of zeolite chabazite (framework type: CHA). While metal substituted aluminophosphate chabazite analogues can be prepared under a variety of experimental conditions with dozens of dierent amines, the synthesis of SAPO-56 type materials has been more dicult, particularly in non-SAPO compositions. Prior to this work, the growth of large crystals of the AFX-type materials suitable for single crystal diraction has not been possible in any composition. Here we report the synthesis and single crystal structure of a magnesium aluminophosphate denoted as MAPO-AFX. This represents the ®rst time that the AFX-type topology is made in a metal aluminophosphate composition. The synthesis was accomplished with a novel polyether diamine as the structure-directing agent. Crystal data for MAPO-AFX, RH 2 0:10 NH 4 0:45 -Mg 0:65 Al 1:35 PO 4 2 H 2 O where R OCH 2 CH 2 OCH 2 3 NH 2 2 , space group P-31c (#163), Z 12, MoK a radiation, 2h max 50°, a 13:8425(6)

A, c 20:204(1) A, V 3352:7(3) A 3 , re®nement on F 2 , RF 7:94% for 131 parameters and 1218 unique re¯ections with I > 2:0r(I).