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Examination guestions KEB-64256 "IR-spectroscopy”

Examination date 15.12.2016

Auditorium K1705 0900-1200

Examiner Alexander Efimov, University lecturer, FC218 TUT/KEB
Total pages: 4

Students are allowed to use the attached reference table (6 pages)

Ouestion 1 (5 points max)

Draw schematically and briefly explain the operational principles of ATR (Attenuated Total Reflectance)
method of IR measurements.

Ouestion 2 (5 points max)
Describe the methods of measurements of liguid samples in IR and how the samples are prepared in each case.
Ouestion 3 (12 points max)

Deduce the structures of the compounds from the Spectra 3a and 3b and brutto-formula. Mark the fragments
in the molecule and their corresponding peaks in the spectra.

Ouestion 4 (5 points max)

Select, which compound (4A, 4B, 4C, 4D) is best corresponding to the Spectrum 4. Mark the fragments in the
molecule and their corresponding peaks in the spectrum.

Ouestion 5 (16 points max)

Select which of the compounds 5A-5F corresponds to Specira 5-1, 5-2, 5-3, 5-4. Mark the fragments in the
molecule and their corresponding peaks in the spectrum.

CH3 CH, OH o
HC >CHg
H3C
sc 5D 5E SF

SA 5B
 

Spectrum

100

TPRRNSHITTANCEN 41

 

3a C,H:N

Ouestion 3

 

 

T
2000

 

908
867
730
635
563
505
600

33
79
81
7D
37
TT
77

 

Spectrum 3b CoH1902

100

HAVENUNBERI -11

1000

T
500

 

TRRNSMITTANCEN%

 

 

 

 

 

 

 

 

v
2 T T= T T T T T
4100 3000 2000 500 1000 500
HAVENUNAERI -11

3499 77 | 2016 81 1422 46 1077 23 630 60

3069 62 1946 81 1384 53 1072 27 813 47

3044 80 | 1879 81 1355 25 1025 44 754 15

3033 68 | 1763 4 1269 43 1006 49 692 15

2985 35 | 1594 20 1459 7 981 36 522 77

2944 43 | 1494 11 | 1164 7 918 537 499 37

2986 64 | 1463 3! 1146 6 874 46

 
Ouestion 4

Spectrum 4

 

 

10D

s0 |

TRANSMITTANCEI 4!

 

o —— < T
41000 3000 2001
HAVENUNEERI 11

 

HC E

ONa

4C

T T T
1500 1000 EL

OH

H;C
4D

 
 

 

 

 

 

 

 

 

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