Table 1.
Thermal and optical properties of compounds 4a–m.
| Molecule | Thermal Characterization | Optical Characterization | ||||
|---|---|---|---|---|---|---|
| Tm (°C) | ΔHm (J/g) | Tc (°C) | ΔHc (J/g) | λmax (nm) | εmax (L mol−1 cm−1) | |
| 4a | 88.7 | 76.5 | 53.35 | 66.17 | 360 | 26,000 |
| 4b | 126.5 | 74.3 | - | - | 360 | 25,000 |
| 4c | 85.00 | 52.6 | - | - | 360 | 26,100 |
| 116.7 | 19.5 | |||||
| 126.0 | 10.8 | |||||
| 4d | 74.2 | 88.4 | - | - | 361 | 38,000 |
| 4e | 59.2 | 56.1 | - | - | 361 | 33,100 |
| 4f * | - | - | - | - | ||
| 4g | 156.3 | 54.2 | - | - | 384 | 3300 |
| 4h | 179.3 | 80.2 | - | - | 384 | 29,500 |
| 4i | 125.3 | 73.6 | - | - | 384 | 35,700 |
| 4j | 82.6 | 47.2 | - | - | 384 | 3000 |
| 4k | 235 | 75.4 | - | - | 382 | 8300 |
| 4l | 238 | 91.5 | - | - | 447 | 7800 |
| 4m | 160 | 24.8 | - | - | 344 | 4600 |
Tm = melting temperature, from DSC analysis, 10 °C/min, nitrogen flow; Tc = crystallization temperature, from DSC cooling run; Instrument error ±0.5 °C. ΔHm/ΔHc = melting/crystallization enthalpy, evaluated by integration of the peak. Experimental error ±5%. λmax = wavelength at the principal absorption maximum, εmax = molar extinction coefficient at absorption maximum. * Compound 4f is an oil at room temperature.