کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
76104 | 49132 | 2008 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Control of framework stoichiometry in MeGaPO laumontites using 1-methylimidazole as structure-directing agent Control of framework stoichiometry in MeGaPO laumontites using 1-methylimidazole as structure-directing agent](/preview/png/76104.png)
A series of heterometal substituted gallium phosphates, (N2C4H7)0.5+x[Me0.5+xGa2.5−x(PO4)3] (Me = Mn, Fe, Co and Zn, x ≈ 0.25), has been synthesised under solvothermal conditions at 433 K in ethylene glycol using 1-methylimidazole as a templating agent and their structures determined at 150 K using single-crystal X-ray diffraction. The compounds are isostructural, crystallising in the monoclinic space group C 2/c, with lattice parameters ca. 15 × 13 × 15 Å and β = 112 °, and adopt the laumontite framework type (LAU). The incorporation of 1-methylimidazole cations into the one-dimensional pore systems of these materials is about three quarters the uptake value obtained previously for the less-bulky amine cations of imidazole and pyridine in other MeGaPO laumontites, which have the formula (TH)[MeGa2(PO4)3] (Me = Mn, Fe, Co and Zn; T = C5H5N and C3N2H4). The size, shape and charge of the amine clearly influence both the metal-phosphate framework stoichiometry (i.e. Me2+:Ga3+ ratio) and the framework charge.
Journal: Microporous and Mesoporous Materials - Volume 112, Issues 1–3, 1 July 2008, Pages 368–376