Crystal as-grown

Fig. 36 IR spectra in (a) the CH2 bending region and (b) CD2 bending region for extended-chain C216H385D49 crystals as-grown from solution and annealed for 30 min at the temperatures indicated (in °C). The spectrum of unannealed crystals is labelled 25 . All spectra were recorded at- 173 °C (from [84] by permission of American Chemical Society)...

All crystals as grown from toluene solution have monoclinic lattice. 

Figure 19. Schematic representation of deuterium end-labeled chains in a crystal as-grown from solution (a) and after annealing (b). The end-group disorder in panel a causes the reduction in CD band splitting in Figure 18b (from ref 103).

X 10" cm /s at 400°, and diffusion is mainly in the a-b plane. Thus, long anneals are required to obtain homogeneous, fully oxygenated crystals. For millimeter-sized crystals, as-grown crystals should be annealed at 400-450° for >4 weeks. Crystals can be sealed under oxygen in a clean, degassed... 

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