| Abstract
| - Three new aluminum diphosphonates (C3H7NH3){AlF[(HO)O2PC2H4PO3]} (1) (orthorhombic, Pnma, a = 8.2048(1)Å, b = 6.90056(6) Å, c = 19.6598(4) Å, Z = 4), (H3NC2H4NH3)[Al(OH)(O3PC2H4PO3)] (2) (monoclinic, P21/n, a =11.142(3) Å, b = 7.008(2) Å, c = 12.903(5) Å, β = 96.24(7)°, Z = 4), and (NH4)2[AlF(O3PCH2PO3)] (3) (orthorhombic,Cmcm, a = 16.592(2) Å, b = 7.5106(9) Å, c = 7.0021(9) Å, Z = 4) have been synthesized by solvothermalmethods in the presence of linear organic ammonium cations (for 1 and 2) and ammonium cations (for 3) and theirstructures determined using powder, microcrystal, and single-crystal X-ray diffraction data, respectively. All threematerials contain a similar one-dimensional chain motif which is related to that found in the mineral Tancoite. Thischain motif consists of corner-sharing octahedra (AlO4F2 for 1 and 3 and AlO6 for 2) linked together through thebridging CPO3 tetrahedra of the diphosphonate groups. These chains are unusual in that each diphosphonatemoiety acts as a bisbidentate ligand that is coordinated to the same two metal centers through both of the O3PC−groups of the diphosphonate ligand. The arrangement of the Tancoite-like chains and charge compensation cationsin the structures of compounds 1−3 is seen to be dependent upon the nature of the diphosphonic acid andorganoammonium/ammonium cations. Careful selection of these two components may provide a method to designfuture materials in this system.
- The first cation-containing aluminum diphosphonates (C3H7NH3){AlF[(HO)O2PC2H4PO3]}, (H3NC2H4NH3)[Al(OH)(O3PC2H4PO3)], and (NH4)2[AlF(O3PCH2PO3)] have been synthesized by solvothermal methods in the presence of linear organic ammonium cations/ammonium cations and their structures determined using X-ray diffraction techniques. All three materials contain a similar one-dimensional chain motif related to that found in the mineral Tancoite which consists of corner-sharing Al-centered octahedra linked together through bridging diphosphonate groups. This is a novel coordination mode for the ethylenediphosphonate groups.
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