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用付里叶变换红外光谱法(FTIR)测定了分别以NaOH和Ca(OH)2作为碱化剂合成的聚合氯化铝铁(PAFCNa,PAFCCa)的中红外光谱。结合分子动力学对弗雷德盐的模拟分析,本文解析了PAFCCa的中红外光谱并提出:PAFCCa中2150 cm-1峰为配位于弗雷德盐层间水分子的组合振动模式。PACCa或PAFCCa中1610,1630 cm-1共轭双峰可解释为:弗雷德盐层间结构中分别配位于Al(Ⅲ)与Ca(Ⅱ)的水分子的变形υ-H2O振动。
The mid-infrared spectra of polymerized aluminum ferric chloride (PAFCNa, PAFCCa) synthesized by using NaOH and Ca (OH) 2 respectively as alkalizing agents were determined by Fourier transform infrared spectroscopy (FTIR). Based on the molecular dynamics simulation of Fred salt, this paper analyzes the mid-infrared spectrum of PAFCCa and proposes that the 2150 cm-1 peak in PAFCCa is the combined vibrational mode of water molecules coordinated with Fred’s salt. The 1610 and 1630 cm-1 conjugate bimodal peaks in PACCa or PAFCCa can be explained as the ν-H2O vibrational deformation of water molecules coordinated respectively to Al (Ⅲ) and Ca (Ⅱ) in the interlayer structure of Fred’s salt.