新型金属膦酸盐的合成、结构和表征

　　新型金属膦酸盐的合成、结构和表征
　　Metal phosphonates are suitable to design inorganic–organic materials. The chemistry of metal phosphonates has been a research field of rapid expansion in recent years, mainly due to their potential application in the area of catalysis, ion exchange, proton conductivity, intercalation chemistry, photochemistry, and materials chemistry. Compared with the intensively studied phosphonates of the d-block transition metals, reports on strontium(II) phosphonate, barium(II) phosphonate and yttrium(III) phosphonate are still limited. Ball Neodymium Magnets In our current studies, we selected N, N’-piperazine-bis(methylenephosphonic acid) (H4Pbp), NaO3S-C2H4-PO3Et2 and m-HO3S-C6H4-PO3H2 (H3L) as the phosphonic acid ligand. By using hydrothermal method or introducing a second ligand, we afforded a novel strontium(II) phosphonate ([Sr(H2Pbp)(H2O)2]·3H2O) (1), a novel barium(II) phosphonate ([Ba2(O3SC2H4PO3H)2]) (2) and a novel yttrium(III) phosphonate metal phosphonate ([Y(L)(phen)(H2O)2]·2H2O) (3). And their syntheses, crystal structures, and characterization have been reported here.Based on our research work, we could draw the following conclusions: (a) Similar to the phosphonates of the d-block transition metals, the http://www.chinamagnets.biz use of bisfunctional or multifunctional anionic units and the use of two types of ligands also can be useful methods to build phosphonate open-frameworks of strontium, barium and yttrium metals. Although alkaline earth metal ions generally show weak coordination ability, but selecting a suitable ligand can also afford a stable metal phosphonate. (b) The introduction of hydrophilic group such as amino group or sulfonate group could greatly improve the solubility and crystallinity of metal phosphonates.