Copper(II) complexes with the tetraaza ligands resulting from single condensation between linear triamines and aromatic aldehydes. Crystal structure of [Cu(pyaDPT)I]I·MeOH, [Cu(pyaMeDPT)I]I·MeOH and [Cu(iqaMeDPT)I]I

The condensation of one primary amino group of the appropriate triamine: bis(2-aminoethyl)-amine (DET), bis(3-aminopropyl)-amine (DPT) or bis(3-aminopropyl)-methylamine (MeDPT), with the appropriate aldehyde: pyridine-2-carboxaldehyde (pya), 3-formylisoquinoline (iqa) or 2-aminobenzaldehyde (aba), has yielded six new quadridentate N4-type ligands: pyaDET, pyaDPT, pyaMeDPT, iqaMeDPT, abaDET and abaDPT. The ligands have been isolated as corresponding copper (II) complexes of the general formula [CuLI]I or [CuLI]I.MeOH. The crystal structures of [Cu(pyaDPT)I]I.MeOH, [Cu(pyaMeDPT)I]I.MeOH and [Cu(iqaMeDPT)I]I complexes have been determined by single crystal X-ray diffraction techniques. The geometry around the copper center is intermediate between idealized square-pyramidal and trigonal-bipyramidal symmetry, with the trigonality increasing on going from [Cu(pyaDPT)I]I.MeOH to [Cu(iqaMeDPT)I]I. Crystallographic data: [Cu(pyaDPT)I]I.MeOH: triclinic, P1, a = 8.398(3), b = 9.503(3), c = 12.191(5) angstrom, alpha = 86.96(3), beta = 85.68(3), gamma = 78.73(3)-degrees, R = 0.076; [Cu(pyaMeDPT)I]I.MeOH: monoclinic, P2(1)/c, a = 9.670(4), b = 12.351(6), c = 17.074(5) angstrom, beta = 95.60(3)-degrees, R = 0.058; [Cu(iqaMeDPT)I]I: monoclinic, P2(1)/n, a = 11.210(3), b = 10.920(4), c = 17.323(5) angstrom, beta = 96.11(2)-degrees, R = 0.045.