Two New Aluminoborates with 3D Porous-Layered Frameworks

Two new aluminoborates, NaKCs[AlB(7)O(13)(OH)]·H(2)O (1) and K(4)Na(5)[AlB(7)O(13)(OH)](3)·5H(2)O (2), have been hydro(solvo)thermally made with mixed alkali metal cationic templates. Both 1 and 2 crystallize in the monoclinic space group P2(1)/n and contain similar units of [B(7)O(13)(OH)](6−) cluster and AlO(4) tetrahedra. The [B(7)O(13)(OH)](6−) cluster is composed of three classical B(3)O(3) rings by vertex sharing, of which two of them connect with AlO(4) tetrahedra to constitute monolayers, and one provides an O atom as a bridging unit to link two oppositely orientated monolayers by Al-O bonds to form 3D porous-layered frameworks with 8-MR channels. UV-Vis diffuse reflectance spectra indicate that both 1 and 2 exhibit short deep-UV cutoff edges below 190 nm, revealing that they have potential applications in deep-UV regions.