Table 1.
An assignment and symmetry of Raman bands of EPO and MPO observed due to excitations at 532, 633, and 785 * nm [11,19,40,41,42].
| 532 nm | 633 nm | 785 nm | Assignment of Modes with Their Symmetry |
|---|---|---|---|
| EPO/MPO | EPO/MPO | EPO/MPO | |
| 756/756 | 756/746 | 756/746 | ν15 (B1g) |
| 937/933 | 937/933 | 937/933 | ν46, (Eu) |
| 1005/1005 | 1005/1005 | 1005/1005 | Phenylalanine |
| -/- | 1122/1115 | 1122/1115 | ν22 (A2g) |
| 1135/1135 | -/- | -/- | ν14 (B1g) |
| 1177/- | 1177/- | -/1177 | ν30 (B2g) |
| -/- | 1216/- | -/- | ν13 (B1g) |
| -/- | -/1240 | 1252/1252 | ν42 (Eu) |
| 1314/1314 | 1314/1314 | -/- | ν21 (A2g) |
| -/- | 1341/1336 | 1341/1341-/- | ν41 (Eu)/δs(=CH2) |
| 1367/1367 | 1367/1361 | -/- | ν4 (A1g) |
| 1395/1395 | 1395/1395 | -/1395 | ν40 (Eu) |
| -/- | -/- | 1453/1453 | CH2/CH3, δs(=CH2) |
| -/- | -/1534 | -/1534 | unknown |
| 1555/1555 | -/- | -/- | ν11 (B1g) |
| -/- | 1564/- | -/- | ν19 (A2g) |
| 1588/1588 | -/1580 | 1580/1588 | ν2 (A1g) |
| 1610/1610 | 1610/- | 1610/- | ν(C = C) |
| 1638/1638 | -/1638 | -/- | ν10 (B1g) |
Modes of EPO and MPO correspond to the D4h symmetry of the porphyrin ring; δs: symmetric bending vibration; ν(C = C) stretching mode of the vinyl substituent, * the band assignment for 785 nm excitation wavelength with regards to spectra of solid EPO and MPO.