Wavenumber/
A B C D E
(NH2 ), Arg[
(C=N)], and/or Amide I— 1631 1615 1639 — Phe[
] and/or Arg[
(
) +
(C=N)] 1603 — — 1608 1602 Phe[
] and/or Pip and/or Arg[
(NH)] 1585 1579 1596 — 1570 Pip — — 1551 — — Imide II’ and/or Thi[
(CC)] 1528 1521 — — — Thi[
(C–C)] — 1500 1495 1504 1501 Phe[
], Arg[
(NH)], and/or tertiary amide IIp marker 1443 1425 1434 1438 1438 Thi[
(CH) +
(C=C)], Pip combination, and/or
(COO− ) — 1365 1379 1360 1377 Arg[
(CH3 )] 1341 — 1339 — — Pip[
(CH2 )] — 1310 — — — Pip[
(CN) +
(CCH) +
(CH2 )] and/or Amide III — 1288 1281 1284 1275 Phe[ν 4 ] 1266 — — — — Pip[
(CH2 )] and/or Amide III — — 1242 1251 — Phe[
] 1203 — — — — Thi[ν (CH)] — 1204 1215 1202 1212 Arg[ν (CN)] and/or Thi[
(CH)] — 1170 1179 1165 1181 Arg[ν (CCC)] and/or Pip[
(CH2 )] — 1148 1142 1151 1144 Aaa[ν (CC)] — — 1111 — 1102 Thi[in-plane
(CH)] and/or Arg [
(CN)] — — — 1093 — Arg[ν (CN)] and/or Thi[
(CH)] — 1083 1070 — 1083 Arg[ν (CC) + ν (NC)] 1058 — — 1045 Phe[
] 1031 — — 1026 Pip[skeletal stretching] — 1020 996 1019 1013 Phe[
] 1002 — — 1000 — ν (CC) +
(CH2 )958 — 945 957 — — — — 939 936 Arg[
(NH2 )], Pip[
(CH)], and/or Thi[
(CH2 ) + γ (ring)] — — — 925 Thi[
(ring) +
(CS)] and/or Pip skeletal stretching — — 881 887 — Arg[δ (NH)], Thi[δ (ring) + ν (CC)], and/or Pip ν (CC) 840 850 — 840 — Pip ring breathing, Arg[
(NH2 )], and/or Thi[ν (CC) + δ (ring)] — 812 833 839 Pip[ring breathing] — 776 763 763 752 Pro[
(CH2 )ring ] 765 — — — Pip — 723 — 729 725 Pip — — 717 700 Thi[
(CH)] and/or Arg [δ (COO− )] 681 678 671 682 670
(COO) and/or Amide— — 652 — — Phe[
] 620 — — — — Pip — 612 — 594 — Thi[
(ring) +
(CH2 )] — — 568 — —
(CO) and/or
(CH2 )— 538 — 534 — Pip — 499 — — — Skeletal 467 — 464 — 457 Thi[
(ring)] — — 426 — —