Divalent-Metal-Stabilized Aluminophosphates Exhibiting a New Zeolite Framework Topology

Two divalent-metal-containing aluminophosphates, (C5H14N2)­[Co2Al4P6O24] and (C5H14N2)­[Zn2Al4P6O24] (denoted
as MAPO-CJ62;
M = Co, Zn), have been hydrothermally synthesized by using N-methylpiperazine as the structure directing agent. Their
structures are determined by single crystal X-ray diffraction and
further characterized by powder X-ray diffraction, inductively coupled
plasma, and thermogravimetric and diffuse reflectance spectroscopy
analyses. Both of these two compounds exhibit a new zeolite framework
topology. This new zeolite framework contains 1-dimensional 8-ring
channels running along the [010] direction. All the metal and P atoms
are tetrahedrally coordinated and alternately connected to each other
through bridging O atoms. Inductively coupled plasma analysis shows
that the molar ratio of M:Al in MAPO-CJ62 is 1:2. The M2+ ions in MAPO-CJ62 selectively occupy two of the three possible crystallographically
distinct positions. A pure aluminophosphate analogue of MAPO-CJ62
without M2+-incorporation, denoted as AlPO-CJ62, has not
been obtained in our experiment so far. The necessity of introducing
M2+ ions and their ordered distribution in MAPO-CJ62 has
been elucidated by analyzing the distortions of Al-centered tetrahedra
in the hypothetical framework of AlPO-CJ62.