X-Ray crystallographic, 1H, and 13C nuclear magnetic resonance investigation of the potentially heptadentate ligand trensal, 2,2′,2″-tris(salicylideneimino)triethylamine

Abstract

The potentially heptadentate ligand trensal, 2.2′2″-tris(salicylideneimino)triethylamine, has been investigated by n.m.r. spectroscopy and X-ray crystallography. The ¹H and ¹³C n.m.r. spectra of this compound have been completely assigned. The single crystal X-ray investigation, R=0.073, showed the compound to be monoclinic, space group P2₁/c, a=9.857(2), b=11.208(2), c= 22.910(4)Å, β=98.81(1)°. Strong intramolecular hydrogen bonding occurs between the hydroxy hydrogen atoms and the azomethine nitrogen atoms. The compound exhibits an approximate three-fold axis when looking down the unique nitrogen atom through the plane C(11)–C(21)–C(31).