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| λabs/nm (ε/M–1·cm–1) | ||
|---|---|---|
| compound | in toluene | in diesel |
| 1 | 595 (1 × 104) | 590 (5 × 103) |
| 2 | 675 (a) | a |
| 3b | 575 (5 × 103) | 570 (2 × 103) |
| 4 | 570 (5 × 103) | 570 (6 × 103) |
| 5 | 575 (7 × 103) | 575 (9 × 103) |
| 6 | 570 (6 × 103) | 570 (6 × 103) |
Because of the weak absorption, the value could not be determined.
The compound was investigated in the crude form at >90% purity.
