Abstract Synthesis, crystal structures and IR spectra of the first representatives of calcium hydrogen selenite halides are reported. Colourless prismatic crystals of calcium hydrogen selenite chloride Ca(HSeO3)Cl and corresponding hydrated analogue Ca(HSeO3)Cl(H2O) were produced upon evaporation of aqueous solutions. Ca(HSeO3)Cl is monoclinic, P21/c, a = 7.0031(11) Å, b = 7.7336(12) Å, c = 8.5024(13) Å, β = 109.889(3)°, V = 433.02(12) Å3, R 1 = 0.039. Ca(HSeO3)Cl(H2O) is orthorhombic, Pbca, a = 6.222(4) Å, b = 10.413(7) Å, c = 16.875(10) Å, V = 1093.3 (12) Å3, R 1 = 0.041. Ca(HSeO3)Cl and Ca(HSeO3)Cl(H2O) represent new structure types. In both structures, Ca2+ cations adopt mixed-ligand environments formed by oxygen atoms of hydrogen selenite anions (and water molecules for Ca(HSeO3)Cl(H2O)) and chloride ions. Both structures are layered. The crystal structure of Ca(HSeO3)Cl(H2O) demonstrates a rare phenomenon of hydrogen-bonded assembly of water and chloride in the interlayer space.

中文翻译：

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层状钙氢亚硒酸盐氯化钙 Ca(HSeO3)Cl 和 Ca(HSeO3)Cl(H2O)，这是在 СaCl2–H2SeO3–H2O 系统中获得的第一个卤化物

摘要 报道了第一代亚硒酸氢钙卤化物的合成、晶体结构和红外光谱。氯化氢亚硒酸钙 Ca(HSeO3)Cl 和相应的水合类似物 Ca(HSeO3)Cl(H2O) 的无色棱柱晶体在水溶液蒸发时产生。Ca(HSeO3)Cl 是单斜晶系，P21/c，a = 7.0031(11) Å，b = 7.7336(12) Å，c = 8.5024(13) Å，β = 109.889(3)°，V = 433.02(12) Å3，R 1 = 0.039。Ca(HSeO3)Cl(H2O) 是斜方晶系，Pbca，a = 6.222(4) Å，b = 10.413(7) Å，c = 16.875(10) Å，V = 1093.3 (12) Å3，R 1 = 0.041。Ca(HSeO3)Cl 和 Ca(HSeO3)Cl(H2O) 代表了新的结构类型。在这两种结构中，Ca2+ 阳离子采用由亚硒酸氢阴离子的氧原子（以及 Ca(HSeO3)Cl(H2O) 的水分子）和氯离子形成的混合配体环境。两种结构都是分层的。