Computational study of the chromatographic enantioseparation of tris(acetylacetonato)cobalt(III) complexes on an arginine complex of cobalt(III) acting as a chiral selector

Acomputational procedure for the modelling of chromatographic separation of neutral tris(acetylacetonato)cobalt(III) into enantiomers on a dinitrobis(arginine)cobalt(III) complex as a chiral selector is described. Predicted elution order calculated from the differences in total energy of interaction for L and D selectands is in agreement with the experimental results. Predictive power of the method and its possible practical applications in designing efficient chiral stationary phases is demonstrated

Synthesis and characterization of tris[butyl-(1-methyl-3-phenyl-propyl)-dithiocarbamato]-cobalt(III) seskvitoluene

A new bidentate ligand butyl-(1-methyl-3-phenyl-propyl)-dithiocarbamate (bmFpdtc) was prepared, as the sodium salt. In the reaction of hexaaminecobalt(III) chloride with NabmFpdtc, the corresponding tris[butyl-(1-methyl-3-phenyl-propyl)-dithiocarbamato]cobalt(III), [Co(bmFpdtc)3] complex was prepared. The complex was characterized by elemental analysis, infrared, electronic absorption, 1H and 13C-NMR spectroscopy

Synthesis, structure and magnetic properties of the first copper(II) complex with an (E)-4-aryl-4-oxo-2-butenoato ligand

A new binuclear Cu(II) complex with an (E)-4-(2,4-diisopropylphenyl)-4-oxo-2-butenoato ligand (L) was successfully synthesized and characterized by elemental analysis and IR-spectroscopy. The structures of (E)-4-(2,4-diisopropylphenyl)-4-oxo-2-butenoic acid (HL), and the corresponding (tetrakis)-mu-[(E)-4-(2,4-diisopropylphenyl)-4-oxo-2-butenoato]-bis(ethanol)-copper(II) complex, [Cu2L4(C2H5OH)(2)], were determined by single crystal X-ray analyses and are preliminarily discussed. This is the first complex of a transition metal with ligand L. as well as the first determined crystal structure of a metal complex with this type of ligand. Analysis of the magnetic susceptibility measurements of the isolated [Cu2L4(C2H5OH)(2)]center dot H2O complex shows the existence of a strong anti-ferromagnetic intra-dimer coupling, with an exchange integral value 2J of -260 cm(-1). (C) 2006 Elsevier B.V. All rights reserved