H. Koshima et al., PREPARATION, STRUCTURE AND DISCRIMINATION OF A CHIRAL BIMOLECULAR CRYSTAL BY THE SELF-ASSEMBLY OF 3-INDOLEPROPIONIC ACID AND PHENANTHRIDINE, Tetrahedron letters, 38(28), 1997, pp. 5009-5012
Although 3-indolepropionic acid and phenanthridine are achiral molecul
es, a chiral bimolecular crystal is spontaneously formed; torsional co
nformation of the propionic acid group plays an important role in the
helix formation through hydrogen bonding chain within the crystal latt
ice. (C) 1997 Elsevier Science Ltd.