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IR Spectroscopy Wu L.M. Salesians of Don Bosco Ng Siu Mui Secondary School.

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Presentation on theme: "IR Spectroscopy Wu L.M. Salesians of Don Bosco Ng Siu Mui Secondary School."— Presentation transcript:

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2 IR Spectroscopy Wu L.M. Salesians of Don Bosco Ng Siu Mui Secondary School

3 HKAL ( * * )

4 HKAL 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.

5 nuclear magnetic resonance (NMR) NMR spectroscopy typically gives the hydrocarbon fragments

6 infra-red spectroscopy the most useful information obtained from an IR spectrum is what functional groups are present within the molecule

7 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=O and C N (Instrumentation is not required)

8 Suggested Experiments / Activities Inspection of IR spectrum of organic compounds.

9 IR Spectroscopy Instrument m/

10 7 IR Characteristic peaks 7 vibrational movement (covalent bond ) 7 (peak)

11 IR spectrum analysis (infrared spectroscopy) ( )

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15 / cm -1 Alkane, C – H 2850 – 2960 Alkene, =C – H 3020 – 3100 Alkene, C=C 1650 – 1670 Alkyne, C – H 3300 Alkyne, – CC – 2100 – 2260 Alcohol, O – H 3400 – 3640 Alcohol, C – O 1050 – 1150 Carboxylic, O – H Amine, N – H 3310 – 3500 Amine, C – N 1030, 1230 Carbonyl, C=O 1670 – 1780 Nitrile, CN 2210 – 2260

16 Characteristic Infra-red Absorption Wave number Ranges (Stretching modes) HKAL

17 IR spectrum

18 IR Real Spectrum

19 IR Spectroscopy Experiment

20 Learning time………. Are you read to examine some IR Spectrum?

21 Alkane C-H

22 Alkene C=C =C-H

23 Alkynes C C C-H 3300

24 Alcohol O-H

25 Alkanoic acid O-H

26 Amine N-H

27 Ketone C=O

28 Aldehyde C=O

29 Nitrile CN C N

30 Test time………. Are you read to identify one unknown IR Spectrum?

31 Ester Quick Test C=O C-H

32 at_id= html


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