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Inicio » Actividades I+D > Publicaciones 2005 > Self-assembly of the cyclic dimer [Cu(hf...
artículo con referato
"Self-assembly of the cyclic dimer [Cu(hfac)2(bpmu)]2 (bpmu=N,N′-bis(3-pyridylmethyl)urea; hfac=hexafluoroacetylacetonate ion) using coordination chemistry and predictable O=C(N–H)2O=C hydrogen bonds"
J. Granifo, M.T. Garland and R.F. Baggio
Inorg. Chem. Comm. 8(6) (2005) 568-573
A novel binuclear metallacyclic complex, [Cu(hfac)2(bpmu)]2, was isolated by reacting copper(II) hexafluoroacetylacetonate with the bpmu ligand. The crystal structure reveals the presence of dimetal units with the Cu(II) centers in a six-coordinate environment and bridged by the bpmu spacers. The crystal consists of a racemate with the two copper(II) ions of one dimer molecule carrying either a ΔΔ or ΛΛ configuration. The pyridyl-urea-based spacers are connected intramolecularly by the expected strong urea-based hydrogen bonds O=C(N–H)2O=C. The same type of H-bonds allows the molecular units of the same chirality to assemble forming supramolecular columns. This conformationally defined array and hydrogen-bonding network, together with the bulky properties of the fragment {Cu(hfac)2}, were used as a pre-programmed supramolecular information for controlling the formation of discrete species.
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