Copper(II) complexes of tetradentate Schiff-base ligands derived from aminothioetherimidazoles. Crystal structure determination of {N-2-[(5′-methylimidazol-4′-yl)methylthio]ethylsalicylideneiminato(1–)-O,N,N′,S}-copper(II) perchlorate

Abstract

Copper(II) complexes of tetradentate Schiff bases derived from aminothioetherimidazoles are described. The crystal structure of the cationic copper(II) complex of the Schiff base derived from the condensation of 4-[(2-aminoethyl)thiomethyl]-5-methylimidazole and salicylaldehyde, [Cu(HL¹)][ClO₄], has been determined by X-ray diffraction methods. Crystals are monoclinic, with a= 10.32(3), b= 11.41 (3), c= 14.34(4)Å, β= 89.33(5)°, space group P2₁/c; 1 196 reflections with I/σ(I) > 3.0 gave R= 0.0587. The copper is in a tetrahedrally distorted, square-planar environment; the imidazole NH is hydrogen bonded to the perchlorate anion.