Structure P6-II. The unit cell of the trigonal polymorph P6-II (Table , second entry) is similar to that of the hexagonal crystals reported in 2011 6 (a, b = 49.85 Å, c = 29.46 Å), the structure of which could not be solved. We probably observe the same type of packing, with small differences related to the solvents used for crystallization (with chloroform and n-hexane used previously) which also results in a different crystal morphology (brown disks for P6-II, instead of black hexagonal plates). In structure P6-II, there are three crystallographically independent molecules of c-P6•T6 forming two distinct layers, assigned as A and B (Fig. ). (7) 106.792(1)° 31.8306(4) 90°