S. Selvanayagam

Crystal structures of salen-type ligands 2-[(1E)-({1-(3-chloro­phen­yl)-2-[(E)-(2-hy­droxy­benzyl­idene)amino]­prop­yl}imino)­meth­yl]phenol and 2-[(1E)-({1-(4-chloro­phen­yl)-2-[(E)-(2-hy­droxy­benzyl­idene)amino]­prop­yl}imino)­meth­yl]phenol

The title compounds are differing only by the position of the chlorine atom in the benzene ring. The molecular structures are very similar, except for the relative position of the hydroxyphenyl rings.

Crystal structure of 2-[4(E)-2,6-bis­(4-chloro­phen­yl)-3-ethyl­piperidin-4-yl­idene]acetamide

In the title piperidine derivative, C21H22Cl2N2O, the piperidine ring adopts a chair conformation. The chlorophenyl rings are oriented at an angle of 45.59 (14)° with respect to each other. In the crystal, molecules are linked via N—H⋯O hydrogen bonds, forming C(4) chains along [100]. The chains are linked by C—H⋯O hydrogen bonds, forming sheets parallel to the ab plane. Within the sheets, there are N—H⋯π interactions present. The crystal studied was refined as an inversion twin.

Crystal structure of 2-(2,4-diphenyl-3-aza-bicyclo-[3.3.1]nonan-9-yl-idene)aceto-nitrile.

In the title 3-azabicyclononane derivative, C22H22N2, both the fused piperidine and cyclohexane rings adopt a chair conformation. The phenyl rings attached to the central azabicylononane fragment in an equatorial orientation are inclined to each other at 23.7 (1)°. The amino group is not involved in any hydrogen bonding, so the crystal packing is stabilized only by van der Waals forces.