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A 1D zigzag polyoxometalate [(CH3)4N]1.50H3.50[Gd(GeW11O39)(H2O)2]·2.5H2O(1) was synthesized by reaction of the monova-cant polyanion [α-GeW11O39]8- with Gd3+ ions in aqueous solution and characterized by IR, UV spectra, ICP, and X-ray crystallography. X-ray single-crystal structural analysis indicated that the title compound crystallized in a monoclinic lattice, C2/c space group with α=2.8201(5), b=2.2885(3), c=2.4033(4) nm,β=123.875 (2)°, V=12.878(4) nm3, Z=8, R1=0.0623, wR2=0.1287. The solid-state structure of the title compound displayed an infinite one-dimensional arrangement built up of [α-GeW11O39]8- polyanions connected by GdⅢ cations. 相似文献
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以对乙酰氨基酚为模型药物分子,温敏水凝胶聚N-异丙基丙烯酰胺(PNIPAAm)为载体,研究了药物在凝胶上的负载和在不同温度(25和37℃)下磷酸盐缓冲溶液(pH 7.4)中的释放行为.结果表明,对乙酰氨基酚的负载量约为35wt%,并且与载体PNIPAAm存在氢键作用.药物在磷酸盐缓冲溶液中的体外模拟释放结果显示,当温度(37℃)高于凝胶的LCST时,对乙酰氨基酚释放的较慢;当温度(25℃)低于其LCST时,释放的较快.因此,可通过环境温度的改变达到APAP在载体PNIPAAm上控制释放的目的. 相似文献
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