Table 1.
Phase transition temperatures (°C), enthalpy of transitions (kJ/mol), and normalized transition entropy temperature for compounds A–D.
| Compound | X | TCr-SmA | ∆HCr-SmA | TSmA-I | ∆HSmA-I | ∆SSmA-I/R | TN-I | ∆HN-I | ∆SN-I/R |
|---|---|---|---|---|---|---|---|---|---|
| A | CH(CH3)2 | 92.3 | 28.76 | 116.4 | 2.33 | 2.41 | - | - | - |
| B | H | 67.3 | 28.38 | 87.3 | 1.92 | 2.65 | - | - | - |
| C | I | 75.4 | 26.87 | 136.3 | 3.11 | 2.74 | 182.0 | 1.87 | 1.24 |
| D | F | 74.1 | 25.48 | 147.5 | 1.80 | 1.47 | - | - | - |
Abbreviations: TCr-SmA = crystal to smectic A transition; TSmA-I = Smectic A to isotropic liquid transition; TN-I = Nematic to isotropic liquid transition. ∆HCr-SmA = crystal to smectic A transition; ∆HSmA-I = Smectic A to isotropic liquid transition; ∆HN-I = Nematic to isotropic liquid transition. ∆SSmA-I/R =Smectic A to isotropic liquid transition; ∆SN-I/R = Nematic to isotropic liquid transition.