Abstract
Two ammonium zinc gallophosphates (I) (NH4)16 [Zn16Ga8P24O96] and (II) (NH4)4[Zn4Ga4P8O32] were hydrothermally synthesized and characterized using single crystal X-ray diffraction. The (I) (NH4)16[Zn16Ga8P24O96] crystallizes in a cubic I213 space group (a=13.456(1) Å, V=2436.5(5) Å3, R (on F)=2.47%, Rw (on F)=2.48%). It has a zeolite analcime topology with distorted eight-member ring channels. Zn and Ga atoms share the same crystallographic site with a partial occupancy of Zn/Ga=0.67/0.33. Ammonium ions lie on the three-fold crystallographic axes and compensate for a negatively charged framework. The second compound (II) (NH4)4[Zn4Ga4P8O32] has a monoclinic symmetry (P21/a, a=9.406(1) Å, b=9.881(1) Å, c=8.612(1) Å, β=90.58(1)°, R (on F)=2.7%, Rw (on F)=3.0%). It is isostructural with a feldspar paracelsian. Zinc and gallium occupy two crystallographic sites with a partial occupancy of Zn(1)/Ga(1) =0.53(6)/0.47(6) and Zn(2)/Ga(2)=0.47(6)/0.53(6). Ammonium ions lie in the elliptical eight-member ring openings of the three-dimensional framework.
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