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首页> 外文期刊>Vibrational Spectroscopy: An International Journal devoted to Applications of Infrared and Raman Spectroscopy >Double beryllium iodate dihydrates, M2Be(IO3)4-2H2O (M = K, NH4~+, Rb): Preparation, X-ray powder diffraction and vibrational spectra
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Double beryllium iodate dihydrates, M2Be(IO3)4-2H2O (M = K, NH4~+, Rb): Preparation, X-ray powder diffraction and vibrational spectra

机译：双铍碘酸盐二水合物，M2BE（IO3）4-2H2O（M = K，NH4〜+，RB）：制备，X射线粉末衍射和振动谱

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摘要

The solubilities in the three-component systems MIO3-Be(IO3)2-H2O (M = K, NH4~+, Rb, Cs) were studied at 25 °C by the method of isothermal decrease of supersaturation. It has been established that double salts, K2Be(IO3)4-2H2O, (NH4)2Be(IO3)4-2H2O, and Rb2Be(IO3)4-2H2O, crystallize from the ternary solutions within wide concentration ranges. Both the X-ray powder diffraction and the spectroscopic studies (infrared and Raman) reveal that the title compounds are isostruc-tural. They crystallize in the monodinic space group P2/m with lattice parameters: K2Be(IO3)4-2H2O-a = 14.2l8(5)A, b = 6.747(2)A, c=5.765(2)A, β=98.74(4)°, V= 546.6(2)A~3; (NH4)2Be(IO3)4-2H2O _ a=14.414(4)A, b = 6.838(2)A, c=5.947(2)A, β=99.52(4)°, V=578.0(2)A~3; Rb2Be(IO3)4-2H2O-a = 14.423(4)A,b = 6.867(2)A,c = 5.743(3)A,β = 98.15(3)°,V=562.9(3)A~3. Infrared spectroscopic experiments show that comparatively strong hydrogen bonds are formed in the potassium and rubidium salts as deduced from the wavenumbers of v_(od) of matrix-isolated HDO molecules (isotopically dilute samples) owing to the strong Be-OH2 interactions (synergetic effect). However, the 103~ ions in the ammonium compound are involved in hydrogen bonds with NH4~+ ions additionally to those with water molecules and as a result of these intermolecular interactions the proton acceptor strength of the iodate ions decreases (anti-cooperative effect), thus leading to the formation of weaker hydrogen bonds in this compound (bonds of moderate strength) as compared to those formed in the potassium and rubidium ones. The normal vibrations of other entities (IO3 ions and BeO4 tetrahedra (skeleton vibrations)) are also discussed.
机译：通过等温降低过饱和的方法，在25℃下研究了三分体系MiO 3-BE（IO3）2-H 2 O（M = K，NH4〜+，RB，CS）的溶解度。已经确定，双盐，K2BE（IO3）4-2H2O，（NH4）2BE（IO3）4-2H2O和RB2BE（IO3）4-2H2O，从宽浓度范围内的三元溶液结晶。 X射线粉末衍射和光谱研究（红外和拉曼）都表明标题化合物是异位形式的。它们在单曲面空间组P2 / m中结晶，用晶格参数：K2BE（IO 3）4-2H2O-A = 14.2L8（5）A，B = 6.747（2）A，C = 5.765（2）A，β= 98.74 （4）°，v = 546.6（2）a〜3; （NH4）2BE（IO3）4-2H2O _ A = 14.414（4）A，B = 6.838（2）A，C = 5.947（2）A，β= 99.52（4）°，V = 578.0（2）a 〜3; RB2BE（IO3）4-2H2O-A = 14.423（4）A，B = 6.867（2）A，C = 5.743（3）A，β= 98.15（3）°，V = 562.9（3）A〜3。红外光谱实验表明，由于强的BE-OH2相互作用（协同效应），从基质 - 分离的HDO分子（同位素稀释样品）的V_（OD）的波数中推导的钾和铷盐中形成了相对较强的氢键。 。然而，铵化合物中的103〜离子与NH 4〜+离子另外的氢键涉及与水分子的那些，并且由于这些分子间相互作用的结果，碘离子的质子受体强度降低（反合作效应），因此，与在钾和铷中形成的那些相比，在该化合物中形成较弱的氢键（中等强度的键）。还讨论了其他实体的正常振动（IO3离子和BEO4四（骨架振动））。

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