Drozd M, Baran J, Pietraszko A
Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, Okólna 2 str., 50-422 Wrocław, Poland.
Spectrochim Acta A Mol Biomol Spectrosc. 2005 Oct;61(13-14):2809-21. doi: 10.1016/j.saa.2004.10.027. Epub 2004 Dec 8.
The crystal structure of diguanidinium hydrogenarsenate monohydrate has been found to belong to the P42(1)/c space group of the tetragonal system, with Z = 8, a = 17.114(2) A, c = 7.3500(10) A. In this complex, a network of hydrogen bonds links water molecules and hydrogenarsenate ions. The hydrogenarsenate ions form hydrogen-bonded chains along the crystallographic c-axis. Detailed vibrational studies have been carried out (FTIR and FT-Raman on powder samples, polarized FTIR microscope on a small single crystal at room temperature). The vibrational spectra are discussed in relation to the crystal structure. Calorimetric (DSC) studies have been performed, but no phase transition was found in the temperature range 100-350 K.
已发现一水合二胍基砷酸氢盐的晶体结构属于四方晶系的P42(1)/c空间群，Z = 8，a = 17.114(2) Å，c = 7.3500(10) Å。在该配合物中，氢键网络连接着水分子和砷酸氢根离子。砷酸氢根离子沿晶体学c轴形成氢键链。已开展了详细的振动研究（对粉末样品进行傅里叶变换红外光谱和傅里叶变换拉曼光谱分析，在室温下对小单晶进行偏振傅里叶变换红外显微镜分析）。结合晶体结构对振动光谱进行了讨论。已进行了量热（差示扫描量热法）研究，但在100 - 350 K温度范围内未发现相变。
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