PREPARATION AND CHARACTERIZATION OF 7,16-DIBENZOYLATED TETRAAZA[14]ANNULENE COPPER(II) COMPLEXES

The reaction between a tetraaza[14]annulene copper(II) complex and a s eries of p-substituted benzoyl chlorides gave the corresponding 7,16-d ibenzoylated complexes in satisfactory yields. The mass spectra reveal the presence of molecular ion peaks based on the 7,16-dibenzoylated c omplexes. A strong IR band which is associated with a C=O stretching m ode is newly observed in the 1653-1660 cm(-1) region upon benzoylation . The electronic spectra for the complexes scarcely change on benzoyla tion and are similar to those for square-planar complexes. The spin Ha miltonian parameters for the benzoylated copper(II) complexes are anal ogous to those for the copper(II) complex that is not benzoylated. The se copper(II) complexes are approximately square-planar with an unpair ed electron in the d(x2-y2) orbital.