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CHEM1020 - Fundamental Chemistry Theory and Practical > Frequencies of IR and NMR > Flashcards

Frequencies of IR and NMR Flashcards

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1
Q

What is the frequency of an N-H (amide) bond in IR spectroscopy?

A

3150-3350 cm-1

There is one band if secondary, two bands if primary.

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2
Q

What is the frequency of an N-H (amine) bond in IR spectroscopy?

A

3300-3450 cm-1

There is one band if secondary, two bands if primary.

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3
Q

What is the frequency of an O-H (carboxylic acid) bond in IR spectroscopy?

A

2450-3450 cm-1

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4
Q

What is the frequency of an O-H (alcohol) bond in IR spectroscopy?

A

2950-3450 cm-1

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5
Q

What is the frequency of a C-H (sp) bond in IR spectroscopy?

A

3250-3350 cm-1

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6
Q

What is the frequency of a C-H (sp2) bond in IR spectroscopy?

A

3050-3150 cm-1

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7
Q

What is the frequency of a C-H (sp3) bond in IR spectroscopy?

A

2800-3000 cm-1

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8
Q

What is the frequency of C≡C bond in IR spectroscopy?

A

2150-2300 cm-1

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9
Q

What is the frequency of C≡N bond in IR spectroscopy?

A

2200-2300 cm-1

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10
Q

What is the frequency of a C=C (alkene) bond in IR spectroscopy?

A

1620-1680 cm-1

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11
Q

What is the frequency of a C=C (aromatic) bond in IR spectroscopy?

A

1450-1610 cm-1

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12
Q

What is the frequency of a C=O (ester) bond in IR spectroscopy?

A

1735-1750 cm-1

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13
Q

What is the frequency of a C=O (aldehyde) bond in IR spectroscopy?

A

1720-1740 cm-1

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14
Q

What is the frequency of a C=O (carboxylic acid) bond in IR spectroscopy?

A

1700-1725 cm-1

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15
Q

What is the frequency of a C=O (ketone) bond in IR spectroscopy?

A

1705-1725 cm-1

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16
Q

What is the frequency of a C=O (amide) bond in IR spectroscopy?

A

1630-1680 cm-1

17
Q

What is the chemical shift of a C=O bond in 13C NMR spectroscopy?

A

150-200 ppm.

18
Q

What is the chemical shift of a C=C (aromatic or alkene) bond in 13C NMR spectroscopy?

A

100-150 ppm.

19
Q

What is the chemical shift of a C-O bond in 13C NMR spectroscopy?

A

50-100 ppm.

20
Q

What is the chemical shift of a C≡C bond in 13C NMR spectroscopy?

A

65-90 ppm.

21
Q

What is the chemical shift of a C-Br, C-Cl or C-N bond in 13C NMR spectroscopy?

A

25-75 ppm.

Higher electronegativity leads to higher values.

22
Q

What is the chemical shift of a C-C=O bond in 13C NMR spectroscopy?

A

35-60 ppm.

23
Q

What is the chemical shift of a C-alkyl bond in 13C NMR spectroscopy?

A

0-50 ppm.

24
Q

What is the chemical shift of an primary alkyl hydrogen atom in 1H NMR spectroscopy?

A

0.8-1.3 ppm.

25
Q

What is the chemical shift of an secondary alkyl hydrogen atom in 1H NMR spectroscopy?

A

1.3-2 ppm.

26
Q

What is the chemical shift of an C≡C-H atom in 1H NMR spectroscopy?

A

1.9-3 ppm.

27
Q

What is the chemical shift of an C=(O)-C-H atom in 1H NMR spectroscopy?

A

2.2-2.8 ppm.

28
Q

What is the chemical shift of an Ph-C-H atom in 1H NMR spectroscopy?

A

2.5-3 ppm.

29
Q

What is the chemical shift of an N-C-H atom in 1H NMR spectroscopy?

A

2.4-2.7 ppm.

30
Q

What is the chemical shift of an C-O-C-H atom in 1H NMR spectroscopy?

A

3.3-3.7 ppm.

31
Q

What is the chemical shift of an C(=O)-O-C-H atom in 1H NMR spectroscopy?

A

4-4.5 ppm.

32
Q

What is the chemical shift of an Cl-C-H atom in 1H NMR spectroscopy?

A

3.6-4.2 ppm.

33
Q

What is the chemical shift of an C(=O)-N-C-H atom in 1H NMR spectroscopy?

A

3.2-3.5 ppm.

34
Q

What is the chemical shift of an C=C-H atom in 1H NMR spectroscopy?

A

4.5-6 ppm.

35
Q

What is the chemical shift of an Ph-H atom in 1H NMR spectroscopy?

A

6-9 ppm.

36
Q

What is the chemical shift of an C(=O)-H atom in 1H NMR spectroscopy?

A

9.4-10.5 ppm.

37
Q

What is the chemical shift an C(=O)-OH atom in 1H NMR spectroscopy?

A

10-13 ppm.

CHEM1020 - Fundamental Chemistry Theory and Practical (7 decks)

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