New organically templated gallium oxalate-phosphate structures based on Ga4(PO4)4(C2O4) building unit |
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| Authors: | Zhenxia Chen Xiang Gao |
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| Institution: | Molecular Catalysis and Innovative Materials Laboratory, Department of Chemistry, Fudan University, Shanghai 200433, PR China |
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| Abstract: | Five organic-inorganic hybrid gallium oxalate-phosphates, Ga2(PO4)2(H2O)(C2O4)0.5](C3N2H12)0.5(H2O) (1), Ga2(PO4)2(C2O4)0.5](C2N2H10)0.5(H2O) (2), Ga2(PO4)2(C2O4)0.5](C3N2H12)0.5 (3), Ga2(PO4)2(H2PO4)0.5(C2O4)0.5](C4N3H16)0.5 (H2O)1.5 (4) and Ga2.5(PO4)2.5(H2O)1.5(C2O4)0.5](C4N3H15)0.5 (5), have been synthesized by using 1,3-diaminopropane, ethylenediamine and diethylene triamine as structure-directing agents under hydrothermal condition. The structures of 1-5 are based on Ga4(PO4)4(C2O4) building unit made up from Ga2O8(C2O4) oxalate-bridging dimer and alternating PO4 and GaO4 tetrahedral units. Compound 1 is layered structure where the building units link together in the same orientation. Corner sharing of these similar layers result in three-dimensional (3-D) structure 2. However, in compound 3, the building units arrange in a wave-like way to generate two types of eight member ring (8MR) channels. Both 4 and 5 contain the layers where the building units have an opposite orientation. Those layers are linked by H2PO4 group and Ga(PO4)(H2O)3 cluster, respectively, to form 3-D frameworks with 12MR large pore channels. Compounds 2-5 exhibit intersecting 3-D channels where the protoned amines are located. |
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| Keywords: | Gallium oxalate-phosphates Open framework Hydrothermal reaction Crystal structure Building unit |
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