Research Article
An Optical Overview of Poly[-L-alanine--nitrato-sodium(I)] Crystals
Table 1
FT-IR and Raman functional group assignments of the grown LASN and DASN.
| RAMAN (cmβ1) | FTIR (cmβ1) | Assignments | LASN | DASN | LASN | DASN |
| 3706 | ββ | ββ | ββ | Overtone | 3426 | ββ | ββ | ββ | Overtone | ββ | ββ | ββ | 3062 | Symmetric CH3 stretching | 3000 | 3003 | ββ | ββ | Asymmetric CH3 stretching | ββ | ββ | 2987 | ββ | Symmetric CH3 stretching | 2964 | 2964 | ββ | ββ | CH2 stretching and asymmetric CH3 stretching | 2948 | ββ | ββ | ββ | Symmetric CH2 stretching | ββ | ββ | 2941 | 2941 | Symmetric NH3 stretching | 2936 | 2933 | ββ | ββ | Asymmetric CH2 stretching | 2888 | 2888 | ββ | ββ | CH2 stretching | ββ | 2734 | ββ | ββ | Overtone | ββ | ββ | 2728 | 2727 | NβHβ―O and OβHβ―O stretching | ββ | 2603 | ββ | 2601 | Symmetric CH stretching | ββ | ββ | 2599 | ββ | Symmetric CH stretching | 2512 | ββ | ββ | 2511 | Overtone | 2484 | ββ | ββ | ββ | Overtone | 2444 | 2442 | ββ | ββ | Overtone | ββ | ββ | 2251 | ββ | CH3 stretching | 2123 | 2119 | ββ | ββ | Overtone | ββ | ββ | 2110 | 2110 | Asymmetric NH3 stretching | 1939 | ββ | ββ | ββ | Asymmetric NH3 deformation | 1775 | ββ | ββ | ββ | Asymmetric COO stretching | 1659 | ββ | ββ | ββ | Asymmetric NH3 deformation | 1630 | ββ | ββ | ββ | Asymmetric NH3 deformation | ββ | ββ | 1613 | 1614 | NH3 bending | 1599 | 1596 | ββ | ββ | Asymmetric NH3 deformation | ββ | ββ | 1584 | 1585 | NH3 bending | 1571 | ββ | ββ | ββ | Asymmetric COO- stretching | ββ | 1543 | ββ | ββ | Overtone | 1531 | ββ | ββ | ββ | Symmetric NH3 deformation | ββ | ββ | 1518 | 1519 | NH3 bending | 1503 | ββ | ββ | ββ | CH3 deformation | ββ | 1496 | ββ | ββ | Overtone | 1486 | 1489 | ββ | ββ | Asymmetric COO- deformation | 1466 | 1465 | ββ | ββ | CΞ²H2 scissors mode | ββ | ββ | 1454 | 1454 | Asymmetric CH3 bending | 1422 | ββ | ββ | ββ | CH3 bending | ββ | 1412 | 1411 | 1411 | Symmetric CβCOOβ stretching | 1386 | ββ | ββ | ββ | CH3 puckering | 1363 | 1366 | ββ | ββ | Wagging CH2 deformation | ββ | ββ | 1358 | 1358 | NO3 stretching | ββ | 1312 | ββ | ββ | CH2 wagging | 1306 | ββ | 1306 | ββ | CβH and NβH bending | ββ | ββ | ββ | 1297 | Flexed position CH2 | ββ | 1235 | 1236 | 1236 | rocking | ββ | ββ | 1218 | 1218 | rocking | 1151 | 1150 | 1151 | 1151 | rocking and symmetric COOβ stretching | 1113 | 1112 | 1113 | 1113 | NO3 stretching | 1070 | ββ | ββ | ββ | Overtone | 1050 | ββ | 1048 | 1048 | Symmetric CCN stretching | 1022 | 1027 | ββ | ββ | CH3 rocking | ββ | ββ | 1012 | 1012 | Overtone of torsional oscillation | 926 | ββ | ββ | ββ | NH3 rocking | ββ | 936 | ββ | ββ | CH2 rocking | ββ | ββ | 918 | 919 | Overtone of torsional oscillation | 853 | 850 | ββ | ββ | NβC stretching | ββ | ββ | 849 | 847 | NO3 stretching | ββ | ββ | 829 | 829 | CβC stretching | 774 | 774 | ββ | ββ | OH deformation | ββ | ββ | 771 | 771 | NO3 stretching | 725 | ββ | ββ | ββ | COO wagging | ββ | ββ | 677 | 678 | in plane deformation | ββ | 651 | 646 | 647 | COOβ in plane deformation | ββ | ββ | 578 | 578 | Overtone |
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