Poly(methylene)
- Monomer Formula: CH2
- Monomer Molecular weight: 14.0266
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Vibrational and/or electronic energy levels
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Takehiko Shimanouchi
Symmetry: D2h Symmetry Number σ = 4
| Sym. | No | Approximate | Selected Freq. | Infrared | Raman | Comments | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Species | type of mode | Value | Rating | Value | Phase | Value | Phase | |||
| ag | 1 | CH2 s-str | 2848 | C | ia | 2848 S | sln. | |||
| ag | 2 | CH2 scis | 1440 | C | ia | 1440 M | sln. | |||
| ag | 3 | CC str | 1131 | C | ia | 1131 M | sln. | |||
| au | 4 | CH2 twist | 1050 | D | 1050 ia VW | sln. | ia | ν1063 cm(ν1 )is given to this mode | ||
| b1g | 5 | CH2 wag | 1370 | D | ia | 1370 VW | sln. | |||
| b1g | 6 | CC str | 1061 | C | ia | 1061 M | sln. | |||
| b1u | 7 | CH2 a-str | 2919 | C | 2919 S | sln. | ia | |||
| b1u | 8 | CH2 rock | 725 | C | 731 S | sln. | ia | Doublet due to the crystal field effect | ||
| b1u | 8 | CH2 rock | 725 | C | 720 S | sln. | ia | Doublet due to the crystal field effect | ||
| b2g | 9 | CH2 twist | 1295 | C | ia | 1295 M | sln. | |||
| b2u | 10 | CH2 s-str | 2851 | C | 2851 S | sln. | ia | |||
| b2u | 11 | CH2 scis | 1468 | C | 1473 S | sln. | ia | Doublet due to the crystal field effect | ||
| b2u | 11 | CH2 scis | 1468 | C | 1463 S | sln. | ia | Doublet due to the crystal field effect | ||
| b3g | 12 | CH2 a-str | 2883 | C | ia | 2883 S | sln. | |||
| b3g | 13 | CH2 rock | 1168 | C | ia | 1168 W | sln. | |||
| b3u | 14 | CH2 wag | 1176 | C | 1176 VW | sln. | ia | |||
Source: Shimanouchi, 1972
Notes
| S | Strong |
| M | Medium |
| W | Weak |
| VW | Very weak |
| ia | Inactive |
| C | 3~6 cm-1 uncertainty |
| D | 6~15 cm-1 uncertainty |
References
Go To: Top, Vibrational and/or electronic energy levels, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Shimanouchi, 1972
Shimanouchi, T.,
Tables of Molecular Vibrational Frequencies Consolidated Volume I, National Bureau of Standards, 1972, 1-160. [all data]
Notes
Go To: Top, Vibrational and/or electronic energy levels, References
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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