Table 2. Low- and Wide-Angle Peak Positions, Spacings d (d1 and d2) Corresponding to the Low-Angle Reflections, and d1/L Ratio Derived from the XRD Profiles of the N* and TGBC* Phases Exhibited by LC Dimer MBC-253a.
| mesogen (molecular length L [Å]) | LC phase | temperature (°C) | low-angle peak position (Å) (spacings d: d1, d2) | wide-angle peak position (Å) | d1/L | tilt angle Φ |
|---|---|---|---|---|---|---|
| MBC-253 (58) | N* | 260 | 16.1 | 4.8 | ||
| TGBC* | 160 | 43.0 (d1), 21.8 (d2) | 4.8 | 0.74 | 42 | |
| 150 | 41.9 (d1), 21.1 (d2) | 0.72 | 43.7 | |||
| 140 | 40.8 (d1), 20.6 (d2) | 0.71 | 45 |
L is the all-trans molecular length (Å) of the LC dimer. Φ = cos–1d1/L.