| CsSm2I5和CsSmI3的合成和结构 |
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| 引用本文： | 陈暹重,王世华,何关有,赵新华,蒋盛邦.CsSm2I5和CsSmI3的合成和结构[J].物理化学学报,1993,9(5):687-691. |
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| 作者姓名： | 陈暹重 王世华 何关有 赵新华 蒋盛邦 |
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| 作者单位： | Department of Chemistry, Beijing Normal University, Beijing 100875 |
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| 基金项目： | 国家自然科学基金，中科院长春应化所稀土化学及物理开放实验室资助项目 |
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| 摘 要： | 自七十年代以来合成了一系列的二价稀土三元卤化物,目的在于发现新的化合物及寻找稳定低价态的配体.但对更易吸水、氧化的二阶稀土三元碘化物系统的研究,最近几年才开始进行.通过相图及直接合成已获得一系列的碘化物,发展了二价稀士三元卤化物化学,但这方面的合成、结构及其性质的研究仅仅是开始.SmI_2-CsI 体系相图的研究指出,在室温存在一些化合物.本文报导采用一步法合成固液同组成化合物CsSmI_3及固液异组成化合物CsSm_2I_5,通过与相图制备法合成的结果比较,以及其它性质的研究,进一步验证了一步法合成的可靠性和优越性.
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| 关 键 词： | 一步法合成 CsSm2I5 CsSmI3 结构 萤光光谱 |
| 收稿时间： | 1992-03-13 |
| 修稿时间： | 1992-06-11 |
SYNTHESIS AND STRUCTURE OF CsSm_2I_5 AND CsSmI_3 |
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| Chen Xianzhong Wang Shihua He Guanyou Zhao Xinhua Jiang Shengbang.SYNTHESIS AND STRUCTURE OF CsSm_2I_5 AND CsSmI_3[J].Acta Physico-Chimica Sinica,1993,9(5):687-691. |
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| Authors: | Chen Xianzhong Wang Shihua He Guanyou Zhao Xinhua Jiang Shengbang |
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| Institution: | Department of Chemistry, Beijing Normal University, Beijing 100875 |
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| Abstract: | The ternary iodides CsSm_2I_5 and CsSmI_3 which contain a divalentt rare earth cation have been synthesized by direct reaction of SmI_2 with CsI and by reaction between Sm, HgI_2 and CsI. Their crystal structures are determined by X-ray powder diffraction technique. CsSm_2I_5 is isostruetural with NH_4Pb_2Cl_5 (monoclinic, p2_1/c) a=1.0219(3) nm, b=9.093(2) nm, c=1.4300(6) nm, β=90.35(4)°, z=4, D_0=5.26 g·cm~(-3) at 25 ℃, D_x=5.34 g·cm~(-3) and MV_x=200.0 cm·mol~(-1). CsSmI_3 is Iso-structural with SrCeO_3 (orthorhombic, Pmmm), a=0.8631(3) nm, b=1.7999(6) nm, c=1.2564(5) nm, z=8, D_0=4.76 g·cm~(-3) at 25 ℃, D_x=4.52 g·cm~(-3), and MV_x=146.9 cm·mol~(-1). The valency of samarium in both compounds were determined and confirmed to be +2 by polarographic analyzer and fluorescence spectra. |
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| Keywords: | One-step synthesis CsSm_2I_5 CsSmI_3 Structure Fluorescence spectra |
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