Journal of Materials Science, Vol.35, No.12, 2965-2972, 2000
Structure analysis and general characterization of the fluorogallophosphate Mu-2: A new microporous material built from double-four-ring units hosting F- anions
A new three-dimensional microporous fluorogallophosphate, named Mu-2, was synthesized from a fluoride-containing aqueous medium in the presence of 4-amino-2,2,6,6-tetramethylpiperidine as organic template. The new material was characterized by microprobe analysis, thermal analysis, X-ray diffraction and solid state NMR spectroscopy. Its structure was determined from X-ray powder as well as single crystal data. The structure of Mu-2 [Ga32P32O120(OH)(16)F-8(C9H20N2H)(4)(C9H20N2H2)(2) . 12H(2)O, M-r = 6687.0, cubic, space group I23 (no. 197), a = 16.3782(2) Angstrom, V = 4393.38(1) Angstrom(3), Z = 1, R-F = 7.7% R-wp = 10.7%] consists of a cubic arrangement of double-four-ring units (D4R) hosting F- anions which are interconnected to form a three dimensional but interrupted framework. This arrangement generates a three-dimensional pore system of eight-membered ring channels. Besides the D4R units, two other types of cages are present in the structure occluding the protonated amine and a (OH)(8)-(H2O)(6)-cluster respectively.