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IR Spectroscopy 紅外色譜學
Wu L.M.
http://walk.to/wu
Salesians of Don Bosco Ng Siu Mui Secondary School
天主教慈幼會伍少梅中學
簡介內容 HKAL 要求 儀器的簡單認識 簡單介紹理論 實驗過程 基本圖譜認識 譜峰認識及練習 ( 下一堂: * 請預備胡老師手冊
* 完成手冊習作 )
HKAL 課程中對紅外色譜學的要求Syllabus: Instrumentation Analysis
An awareness that spectroscopic methods such as
infra-red spectroscopy
and
nuclear magnetic resonance (NMR)
can provide information about the structure
of a molecule.
nuclear magnetic resonance (NMR) NMR spectroscopy typically gives the
hydrocarbon fragments
infra-red spectroscopy the most useful information obtained from
an IR spectrum is what functional groups are present within the molecule
Topic: Use of infra-red (IR) spectrum in the identification of functional groups IR spectrum and its use in the identification of the
following groups: C-H O-H N-H C=C C≡C C=O and C ≡ N (Instrumentation is not required)
Suggested Experiments / Activities
Inspection of IR spectrum of
organic compounds.
紅外線化學儀器IR Spectroscopy Instrument
伍少梅紅外線化學分析網頁
http://hk.geocities.com/tempalbum/
7 IR Characteristic peaks
7 vibrational movement (covalent bond ) 共價鍵
7 個主要官能基 分子的指紋 (peak)
IR spectrum analysis
紅外光譜術 (infrared spectroscopy) 是用來偵測分子的振動能量 ( 或頻率 ) 的技術 鍵長 鍵角
精確地預測分子振動頻率
震動方法
官能基 譜峰位置 / cm-1 Alkane, C–H 2850–2960 Alkene, =C–H 3020–3100 Alkene, C=C 1650–1670 Alkyne, ≡C–H 3300 Alkyne, –C≡C– 2100–2260 Alcohol, O–H 3400–3640 Alcohol, C–O 1050–1150 Carboxylic, O–H 2250-3100 Amine, N–H
3310–3500 Amine, C–N
1030, 1230 Carbonyl, C=O 1670–1780 Nitrile, C≡N 2210–2260
Characteristic Infra-red Absorption Wave number Ranges(Stretching modes)
HKAL
IR spectrum
IR Real Spectrum
IR Spectroscopy Experiment
實驗過程短片 香港科技大學
Learning time……….
Are you read to examine some
IR Spectrum?
Alkane
C-H : 2840-3095
Alkene
C=C : 1610-1680=C-H :3020-3100
Alkynes
C ≡ C : 2100-2260
≡C-H : 3300
Alcohol
O-H : 3400-3640
Alkanoic acid
O-H : 2250-3100
Amine
N-H : 3310-3500
Ketone
C=O : 1670-1780
Aldehyde
C=O : 1670-1780
Nitrile CN
C≡N : 2200-2260
Test time……….
Are you read to identify
one unknown IR Spectrum?
EsterQuick Test
C=O : 1670-1780
C-H : 2840-3095
自學網頁 胡老師網頁 及 其他參考網頁
http://walk.to/wu http://hk.geocities.com/tempalbum/ http://orgchem.colorado.edu/hndbksupport/irtutor/tutorial.html http://www.hkedcity.net/resources/ires/ires_browse.phtml?
res_cat_id=2870 http://www.chem.ucalgary.ca/courses/351/Carey/Ch13/ch13-ir-
1.html http://www.cofc.edu/~chem/organic/Slides/IR2c/sld019.htm
拜拜!