Synthesis and spectroscopic characterization of [CoIII(salophen)(amine)2]ClO4 (amine = morpholine, pyrrolidine, and piperidine) complexes.: The crystal structures of [CoIII(salophen)(morpholine)2]ClO4 and [CIII(salophen)(pyrrolidine)2]ClO4

Three Co(III) complexes of the type [Co(salophen)(amine)(2)]ClO4, salophen = N,N ' -disalicylidene-1,2-phenylendiamine dianion and amine = morpholine (1), pyrrolidine (2), and piperidine (3), have been synthesized and characterized by elemental analysis, IR, UV-Vis, H-1, and C-13 NMR spectroscopy. [Co(salophen)(morpholine)(2)]ClO4 (1) and [Co(salophen)(pyrrolidine)(2)]ClO4 (2) have been studied by X-ray diffraction. Compound 1 crystallizes in ribbons of complexes and perchlorates held together by weak N-H . .O and C-H . . .O hydrogen bonds between morpholines and perchlorates. The latter also interconnect the chains to a 3D network. Some minor pi-pi interactions exist. Compound 2 crystallizes as endless chains of complexes linked by weak C-H . . .O hydrogen bonds to the disordered perchlorates. The pyrrolidine moiety is turned by 90 degrees with respect to 1 and forms intramolecular N-H . . .O hydrogen bonds, The coordination polyhedra of 1 and 2 possess C-s symmetry, and the salophens are not planar in either of them. (C) 2001 Elsevier Science B.V. All rights reserved.