DIMER FORMATION WITH CRYSTALLOGRAPHIC 2-FOLD AXIS - STRUCTURE OF ISK))-2-(P-NITROBENZYLIDENEAMINO)-1-PHENYLPROPANOL

The crystals of the title compound, 2S)-2-(p-nitrobenzylideneamino)-1 -phenylpropanal, are monoclinic, space group P2/n (No. 13), a = 15.159 (1)Angstrom, b = 6.061(1)Angstrom, c = 16.436(1)Angstrom, beta = 102.2 9(1)degrees, V= 1475.4(5)Angstrom(3), Z = 4, D-c = 1.28 g cm(-3), lamb da(CuK alpha) = 1.54184 Angstrom, mu = 0.7 mm(-1), F(000) = 600, T = 2 96 K. The structure is solved dy direct methods and refined to R = 0.0 44 for 1672 observed reflections collected on a CAD-4 diffractometer. The relative position of the hydrogen bond donor and acceptor, charact erized by the intramolecular non-bonded 01 ... N3 distance of 2.967(2) Angstrom and the torsion angle 01-C5-C4-N3 = 72.7(3)degrees, gives ri se to dimers formed around the two-fold axes. A similar structure, als o possessing two-fold symmetry related molecular dimers formed in the space group No. 13 is retrieved from the Cambridge Structural Database . The similarity of their packing is discussed.