Tableau 1. Moldcule dtudide et mol6cules apparentdesThe crystal structure of carbamazepine, C15H12N20 , has been determined from 1521 diffractometer data by multisolution direct methods and refined by full-matrix least squares to a final residual R index of 0.035. Crystals are monoclinic, P2{c, with a = 7.529 (1)
The structure of iminostilbene, Cl4HllN , has been determined from 826 diffractometer data by direct methods and refined by least-squares calculations to a final R factor of 0.035. The space group is Pnma with a = 8.
The structure of iminodibenzyl, CI4H13N, parent molecule of a very important group of antidepressant drugs, has been determined from 2422 diffractometer data by direct methods and refined to a final residual R of 0.049. The space group is monoclinic, P2Jc, with a = 11.604 (4), b = 11.269 (4), c = 20.050 (8)/k; fl = 126-55 (4)°; Z = 8, V = 2106.2 /k3; D m = 1.22 (1), D x = 1.23 Mg m -3. All the hydrogen atoms were placed by analyzing a section of the three-dimensional density function. The two independent molecules (I and II) have nearly the same fold configuration as phenothiazine: the dihedral angles between the two planes of the benzene rings are 151-3(5) and 154.1 (3) ° respectively for I and II.
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