S. No. | Symbol | Description | Definition |
1) In-plane vibrations (a' species) Stretching | |||
1 - 6 | di | C-C (ring) | C1-C2, C2-C3, C3-C4, C4-C5, C5-C6, C6-C1 |
7 | ri | C-Ca (acid) | C1-C7 |
8 | ,, | C-C' (methyl) | C4-C15 |
9 - 11 | ,, | C-H (ring) | C2-H11, C5-H19, C6-H20 |
12 | ,, | C-N | C3-N12 |
13 - 15 | Ri | C-H (methyl) | C15-H16, C15-H17, C15-H18 |
16 | Di | Ca=O | C7-O8 |
17 | ,, | Ca-OH | C7-O9 |
18 | ,, | O-H | O9-H10 |
19 - 20 | Ei | N=O | N12-O13, N12-O14 |
Bending | |||
21 - 26 | qi | C-C-C (ring) | C6-C1-C2, C1-C2-C3, C2-C3-C4, C3-C4-C5, C4-C5-C6, C5-C6-C1 |
27 - 32 | fi | C-C-H (ring) | C1-C2-H11, C3-C2-H11, C4-C5-H19, C6-C5-H19, C5-C6-H20, C1-C6-H20, |
33 - 35 | ei | C-C-H (methyl) | C4-C15-H16, C4-C15-H17, C4-C15-H18 |
36 - 38 | ai | H-C-H | H16-C15-H17, H16-C15-H18, H16-C15-H18 |
39 | li | C-Ca=O | C1-C7-O8 |
40 | ,, | C-Ca-O | C1-C7-O9 |
41 | ,, | O-Ca=O | O8-C7-O9 |
42 | ,, | Ca-O-H (acid) | C7-O9-H10 |
43 - 44 | βi | C-C-Ca (acid) | C6-C1-C7, C2-C1-C7 |
45 - 46 | ,, | C-C-C' (methyl) | C3-C4-C15, C5-C4-C15 |
47 - 48 | ,, | C-C-N | C2-C3-N12, C4-C3-N12 |
49 - 50 | y | C-N-O | C3-N12-O13, C3-N12-O14 |
51 | yi | O-N-O | O13-N12-O14 |
1) Out-of-plane vibrations (a" species) Wagging | |||
52 - 54 | gi | p(CH) | C1-C2-C3-C11, C4-C5-C6-C19, C5-C6-C1-H20 |
55 | ,, | p(CCa) | C6-C1-C2-C7 |
56 | ,, | p(CC') | C3-C4-C5-C15 |
57 | ,, | p(CN) | C2-C3-C4-N12 |
58 | wi | w(OH) | C1-C7-O9-H10 |
59 | ,, | w(Ca=O) | C6-C1-C7-O9 |
Torsion | |||
60 - 65 | di | τ (ring) | C1-C2-C3-C4, C2-C3-C4-C5, C3-C4-C5-C6, C4-C5-C6-C1, C5-C6-C1-C2, C6-C1-C2-C3 |
66 | τi | τ(CCa) | C2-C1-C7-O8 |
67 | ,, | τ(CC¢) | C3-C4-C15-H18 |
68 - 69 | ,, | τ(CN) | C2-C3-N12-O14, C4-C3-N12-O13 |
70 - 71 | wi | w(NO2) | C3-N12-O14-O13, C3-N12-013-O14 |