次硝酸铋分子结构及热变性研究

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中图分类号：O657.33 文献标识码：A DOI：10.7535/hbkd.2026yx02011

Abstract：To addresstheunresolvedissesofmolecularconfigurationand thermal stabilitymechanism of bismuth subnitrate，mid-infrared（MIR）spectroscopy，one-dimensional variable temperature mid-infrared（1DVT-MIR）spectroscopy 0 303～573K ）and two-dimensional mid-infrared （2D-MIR）spectroscopy were used to analyze the temperature-dependent characteristicsof its molecular vibrations.Theresults showthatthe molecular structureofbismuth subnitrate mainly includes four infrared absorption modes： asymmetric telescopic vibration mode of NO3 functional group asymmetrical stretching vibration mode （νasNO3-bismuthsubnitrate） ， NO3 functional group symmetrical stretching vibration mode ， NO3 functional group out-of-plane bending vibration mode （rNO3-bismuthsubnitrate） and NO3 functional group in-plane bending vibration mode （βNO3-bismuthsubnitrate） . In the temperature range of 303～573K ，the absorption intensity and frequency corresponding to the main functional groupsof its molecular structurechange significantly，andthe2D-MIR spectroscopycanefectivelycapture the informationofthechangeof theabsorptionpeaksof themainfunctional groups.Thisstudyclarifiesthemolecularstructure characteristics and thermal denaturation lawof bismuth subnitrate，and confirms that tertiary mid-infrared spectroscopy technologycanbeefectivelyappliedtothemolecularstructureandthermaldenaturationofbismuthsubnitrate，whichprovides technical support and data reference for the related research of this type of inorganic fine chemicals.

Keywords：spectral analysis；bismuth subnitrate；structure;thermal denaturation;mid-infrared spectroscopy；one-dimensional variable temperature mid-infrared spectroscopy；two-dimensional mid-infrared spectroscopy

在无机精细化学品结构与性能的研究领域，中红外（mid-infrared，MIR）光谱作为揭示分子构型与化学键信息的核心技术，发挥着不可替代的作用[1-5]。（剩余10338字）