Table 2.
Band assignments.
| Mode | Band (cm−1) | Formamide adsorbed on |
|||||
|---|---|---|---|---|---|---|---|
| Formamide | Literature | Antigorite | TiO2 | Pyrite | Spinel | Forsterite | |
| νas NH2 | 3266 | 3368(1) | 3350 | 3298 | ... | 3285 | 3275 |
| νs NH2 | 3162 | 3181(1) | 3166 | 3166 | ... | 3166 | 3166 |
| ν CH | 2895 | 2891(1) | 2891 | 2891 | 2890 | 2891 | 2891 |
| ... | ... | ... | 2815 | 2815 | 2816 | 2816 | 2815 |
| ν CH | ... | 2770 − 2763(2) | 2770 | ... | ... | 2772 | 2771 |
| ν CO | ... | ... | 2473 | 2471 | 2473 | 2475 | 2474 |
| νas CO2 | ... | ... | ... | ... | ... | 2348 | ... |
| ν CO | ... | ... | 2329 | 2328 | ... | 2323 | 2328 |
| νas NCO | ... | ... | 2275 | 2275 | 2276 | 2277 | 2277 |
| ν CO | ... | 1754(3) | 1750 | 1750 | 1750 | 1750 | 1750 |
| ν CO | 1715 | 1713(2) | 1716 | 1717 | 1717 | 1716 | 1717 |
| ν CO | 1697 | 1698 − 1704(1) | 1699 | 1699 | 1699 | 1699 | 1699 |
| ν CO | 1684 | 1685 − 1681(1) | 1684 | 1684 | 1684 | 1684 | 1684 |
| s NH2 | 1635 | 1631(4, 1) | 1635 | 1635 | 1635 | 1635 | 1635 |
Notes. First column: vibrational modes; second column: bands observed in the IR reflectance spectrum of pure formamide during laboratory work; third column: band assignments based on published experimental and theoretical studies: (1) Sivaraman et al. 2013, (2) Nguyen 1986, (3) Mc Naughton et al. 1999, (4) Brucato et al. 2006; other columns: bands observed in the IR reflectance spectrum of formamide adsorbed by antigorite, TiO2, pyrite, spinel, forsterite. Vibrational modes: νs symmetric stretching; νas asymmetric stretching; ν stretching; s shissoring.
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