Salesians of Don Bosco Ng Siu Mui Secondary
Salesians of Don Bosco Ng Siu Mui Secondary School 天主教慈幼會伍少梅中學 IR Spectroscopy 紅外色譜學 Wu L. M. http: //walk. to/wu
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. n
nuclear magnetic resonance (NMR) n NMR spectroscopy typically gives the hydrocarbon fragments
infra-red spectroscopy n 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) n
Suggested Experiments / Activities Inspection of IR spectrum of organic compounds. n
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 n n n 7 vibrational movement (covalent bond )共價鍵 7個主要官能基 分子的指紋(peak)
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-H: 3020 -3100 C=C: 1610 -1680
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?
Quick Test Ester C=O: 1670 -1780 C-H: 2840 -3095
自學網頁 n 胡老師網頁 及 其他參考網頁 n n n http: //walk. to/wu http: //hk. geocities. com/tempalbum/ http: //orgchem. colorado. edu/hndbksupport/irtutor/tutorial. html http: //www. hkedcity. net/resources/ires_browse. phtml? res_c at_id=2870 http: //www. chem. ucalgary. ca/courses/351/Carey/Ch 13/ch 13 -ir 1. html http: //www. cofc. edu/~chem/organic/Slides/IR 2 c/sld 019. htm 拜拜!
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