Synthesis, spectral studies and X-ray crystal structure of N,N′-(±)-trans-1,2-cyclohexylenebis(3-ethoxysalicylideneamine) H2(t-3-EtOsalchxn)

The synthesis, spectra and X-ray crystal structure of N,N′-(±)-trans-1,2-cyclohexylenebis(3-ethoxysalicylideneamine) H2(t-3-EtOsalchxn), a salen-type ligand, are reported. The Schiff base was characterized by elemental analysis, m.p., IR, electronic spectra, 1H and 13C NMR spectra. The spectra are discussed and compared with those of N,N′-(±)-trans-1,2-cyclohexylenebis(salicylideneamine), H2(t-salchxn). The electronic and IR spectra were also resolved by deconvolution. The influence of the ethoxy group on the IR, electronic spectrum, 1H and 13C NMR spectra is discussed. Strong intramolecular forces are present as supported by the IR and 1H NMR spectra and the X-ray crystal structure. An intermolecular hydrogen bond is observed and appears twice in a pair of molecules in the unit cell.