Edexcel A-Level Chemistry: Combined Spectral Analysis (MS, IR and NMR) | 爱德思 A-Level 化学：波谱综合分析（质谱、红外与核磁共振）

📚 Edexcel A-Level Chemistry: Combined Spectral Analysis (MS, IR and NMR) | 爱德思 A-Level 化学：波谱综合分析（质谱、红外与核磁共振）

In Edexcel A-Level Chemistry, structure determination questions often ask you to combine mass spectrometry, infrared spectroscopy and ¹H NMR evidence. A single spectrum is rarely enough to identify an unknown organic compound; the marks come from linking each piece of evidence to a structural feature.

在爱德思 A-Level 化学中，结构推断题常要求你综合质谱、红外光谱和 ¹H 核磁共振的证据。单一谱图通常不足以鉴定未知有机物；得分点在于把每条证据与某个结构特征联系起来。

1. Why Combined Analysis? | 为什么需要综合分析

Each technique answers a different question. Mass spectrometry gives the molecular mass and molecular formula, infrared spectroscopy identifies functional groups, and ¹H NMR shows the number, kind and neighbouring relationships of hydrogen atoms.

每种技术回答不同问题。质谱给出分子质量和分子式，红外光谱识别官能团，而 ¹H 核磁共振显示氢原子的数量、种类和邻接关系。

Using them together is especially important for structural isomers. For example, an ester and a carboxylic acid may have the same molecular formula, but IR and NMR can distinguish them quickly.

把它们结合起来对结构异构体尤其重要。例如，酯

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