Xie YS, Jiang H, Liu XT, Zhou ZY, Liu QL, Xu XL (2002b) Syntheses and characterization of copper(II) and cobalt(II) complexes with tris 2-(benzylamino)ethyl amine. Collection of Czechoslovak Chemical Communications 67(11), 1647-1657. [In English]

Web link: http://dx.doi.org/10.1135/cccc20021647

Keywords:

copper(II) complexes; cobalt(II) complexes; crystal structure; determination; tren derivative; tripodal ligands; X-ray diffraction; tripodal tetradentate ligands; crystal-structure; spectroscopic; properties; molecular-structures; bridging ligand; dioxygen; binding; nickel(ii); spectra; adducts

Abstract: Two mononuclear complexes [Cu(NCS)(trenb)]ClO4 (1) and [Co(NCS)(trenb)]Cl.H2O (2), where trenb is tris[ 2-(benzylamino)ethyl] amine, were prepared and characterized by elemental analysis, IR, electronic and EPR spectra. Their crystal structures were determined by X-ray diffraction. Complexes 1 and 2 are both five-coordinated with their metal centers in the distorted trigonal-bipyramidal environment. Each metal(II)ion coordinates with the tetradentate trenb, and one isothiocyanate anion. The two complexes are not isostructural as there are also a chloride and a water molecule in the asymmetric unit of 2. Besides balancing the charge, the chlorides are also involved in intramolecular and intermolecular hydrogen bonds with the secondary amine groups, resulting in a one-dimensional chain structure. UV-VIS spectrum and EPR measurement for 1 have unambiguously confirmed that the five-coordinated structure is retained in solution, even in the donating solvent such as DMF.