Syntheses and Single-Crystal X-ray Structures of a Series of Monosubstituted <i>cis</i>,<i>cis</i>-1,3,5-Triaminocyclohexane-Based Complexes

The four triimine compounds <i>cis</i>,<i>cis</i>-1,3,5-tris[(<i>E</i>)-(X)-benzylideneamino]cyclohexane [X = H (<b>1</b>); 3-hydroxy (<b>2</b>); 3,5-dimethoxy (<b>3</b>); 4-acetamido (<b>4</b>)] are synthesized by the condensation of <i>cis</i>,<i>cis</i>-1,3,5-triaminocyclohexane with a substituted aromatic aldehyde. Complexation of these ligands with metal salts (<b>1</b> with Ni, Cu, and Zn salts; <b>2</b> and <b>3 </b>with Cu salts; <b>4</b> with a Zn salt) causes a selective hydrolysis reaction producing new monoimine complexes. The resulting complexes are characterized by a combination of infrared spectroscopy, elemental analysis, mass spectrometry and, in the cases of the zinc complexes, <sup>1</sup>H NMR spectroscopy. The structures of all six complexes are confirmed by single-crystal X-ray crystallographic studies.