摘要
采用中红外(MIR)光谱开展了亚硫酸钠分子结构研究。研究发现:亚硫酸钠红外吸收模式主要包括:亚硫酸钠分子SO3不对称伸缩振动模式(νasSO3-Na2SO3)和亚硫酸钠分子SO3面内弯曲缩振动模式(βSO3-Na2SO3)。采用变温中红外(TD-MIR)光谱进一步开展了温度变化对于亚硫酸钠分子结构的影响。研究发现:在293~393 K,随着测定温度的升高,亚硫酸钠νasSO3-Na2SO3和βSO3-Na2SO3对应的红外吸收频率和强度均发生明显的改变。以亚硫酸钠νasSO3-Na2SO3和βSO3-Na2SO3为研究对象,采用二维中红外(2D-MIR)光谱进一步开展了亚硫酸钠热稳定性研究。研究发现:亚硫酸钠νasSO3-Na2SO3-2D对应的吸收频率包括:974 cm^-1(νasSO3-1-Na2SO3-2D)和934 cm^-1(νasSO3-2-Na2SO3-2D),随着测定温度的升高,亚硫酸钠νasSO3-a2SO3-2D对应的吸收峰变化快慢的顺序为:934 cm^-1(νasSO3-2-Na2SO3-2D)>974 cm^-1(νasSO3-1-Na2SO3-2D)。亚硫酸钠βSO3-Na2SO3-2D对应的吸收频率包括:632 cm^-1(βSO3-1-Na2SO3-2D)、630 cm^-1(βSO3-2-Na2SO3-2D)、624 cm^-1(βSO3-3-Na2SO3-2D)和618 cm^-1(βSO3-4-Na2SO3-2D),随着测定温度的升高,亚硫酸钠βSO3-Na2SO3-2D对应的吸收峰变化快慢的顺序为:624 cm^-1(βSO3-3-Na2SO3-2D)>632 cm^-1(βSO3-1-Na2SO3-2D)>630 cm^-1(βSO3-2-Na2SO3-2D)>618 cm^-1(βSO3-4-Na2SO3-2D)。该研究拓展了三级MIR光谱在重要的无机盐(亚硫酸钠)分子结构及热稳定性的研究范围。
The Na2SO3 organic molecular structure were characterized by the infrared(MIR)spectroscopy.There were Na2SO3/SO3 asymmetry stretch vibration mode(νasSO3-Na2SO3)and Na2SO3/SO3 in-plane bending vibration(βSO3-Na2SO3).The temperature effect on Na2SO3 structure by temperature-dependent infrared(TD-MIR)spectroscopy were studied also in the temperature range 293~393 K.With the increase of the temperature,the corresponding frequency and intensity of Na2SO3(νasSO3-Na2SO3 andβSO3-Na2SO3)had changed obviously.The thermal stability of Na2SO3(νasSO3-Na2SO3 andβSO3-Na2SO3)were considered by the two dimensional infrared(2D-MIR)spectroscopy also.There were 974 cm^-1(νasSO3-1-Na2SO3-2D),934 cm^-1(νasSO3-2-Na2SO3-2D)and the sequence of Na2SO3/νasSO3-Na2SO3-2D infrared absorption peak changes order were 934 cm^-1(νasSO3-2-Na2SO3-2D)>974 cm^-1(νasSO3-1-Na2SO3-2D).There were 632 cm^-1(βSO3-1-Na2SO3-2D),630 cm^-1(βSO3-2-Na2SO3-2D),624 cm^-1(βSO3-3-Na2SO3-2D),618 cm^-1(βSO3-4-Na2SO3-2D)and the sequence of Na2SO3/βSO3-Na2SO3-2D infrared absorption peak changes order were 624 cm^-1(βSO3-3-Na2SO3-2D)>632 cm^-1(βSO3-1-Na2SO3-2D)>630 cm^-1(βSO3-3-Na2SO3-2D)>618 cm^-1(βSO3-4-Na2SO3-2D).The paper demonstrated the key roles of three-step MIR spectroscopy in the analysis of molecular structure and thermal stability of the important inorganic salt(Na2SO3).
作者
于宏伟
王晓萱
王雪琪
齐哲真
张蕊
戎媛
YU Hongwei;WANG Xiaoxuan;WANG Xueqi;QI Zhezhen;ZHANG Rui;RONG Yuan(Shijiazhuang University School of Chemical Engineering,Shijiazhuang,Hebei,050035,China)
出处
《硫酸工业》
CAS
2020年第10期13-18,共6页
Sulphuric Acid Industry
基金
2019-2020年度河北省应用技术大学研究会课题(JY2019011)。
