Densitometry, UV–Vis and FT IR spectroscopy were used to study the complex formation of cobalt(II) chloride and nickel(II) chloride with diethylsulfoxide (DESO). The apparent molar volumes and partial molar volumes were determined for solvated ions in DESO. The complex formation of nickel(II) and cobalt(II) ions with DESO molecules via oxygen atom of SO group was revealed from the SO stretching band in the FT IR spectra. UV–Vis spectra show the coexistence of two types of complexes with DESO in solution. The results show that solvating ability of DESO is stronger than that of dimethylsulfoxide.

中文翻译：

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CoCl2（或 NiCl2）在二乙基亚砜中的溶液的热力学和光谱（UV-Vis、FT IR）研究

使用光密度测定法、UV-Vis 和 FT IR 光谱来研究氯化钴 (II) 和氯化镍 (II) 与二乙基亚砜 (DESO) 的络合物形成。测定 DESO 中溶剂化离子的表观摩尔体积和偏摩尔体积。从 FT IR 光谱中的 SO 伸缩带揭示了镍 (II) 和钴 (II) 离子与 DESO 分子通过 SO 基团的氧原子形成络合物。UV-Vis 光谱显示溶液中两种类型的配合物与 DESO 共存。结果表明DESO的溶解能力强于二甲亚砜。