467232-84-4Relevant academic research and scientific papers
Dinuclear copper complexes based on parallel β-diiminato binding sites and their reactions with O2: Evidence for a Cu-O-Cu entity
Haack, Peter,Limberg, Christian,Ray, Kallol,Braun, Beatrice,Kuhlmann, Uwe,Hildebrandt, Peter,Herwig, Christian
, p. 2133 - 2142 (2011/08/07)
Investigations concerning the system β-diketiminato-Cu I/O2 have revealed valuable insights that may be discussed in terms of the behavior of mononuclear oxygenases containing copper. On the other hand nature also employs dinuclear C
Syntheses and structures of bis(2,6-xylyl-nacnac) copper(I) complexes
Oguadinma, Paul O.,Schaper, Frank
, p. 570 - 574 (2009/04/14)
The copper(I) complexes {(bis-2,6-dimethylphenyl-penta-2,3-diiminato)Cu}2(μ-toluene), 3 has been prepared and its reactivity against Lewis bases and nitrous oxide investigated. Complex 3 crystallizes as a toluene-bridged dimer and forms mono- and dinuclear benzene adducts in C6D6 solution. It does not coordinate excess THF, but reacts quantitatively with 1 equiv. of acetonitrile. Reaction with 2,6-xylyl isonitrile yields (bis-2,6-dimethylphenyl-penta-2,3-diiminato)Cu(2,6-xylyl isonitrile), 5, (νCN = 2123 cm-1), which was characterized by an X-ray diffraction study. Complex 3 does not react with nitrous oxide in either C6D6 solution (5 days 50 °C) or in diethyl ether (13 days at ambient temperature).
Copper chemistry of β-diketiminate ligands: Monomer/dimer equilibria and a new class of bis(μ-oxo)dicopper compounds
Spencer, Douglas J. E.,Reynolds, Anne M.,Holland, Patrick L.,Jazdzewski, Brian A.,Duboc-Toia, Carole,Le Pape, Laurent,Yokota, Seiji,Tachi, Yoshimitsu,Itoh, Shinobu,Tolman, William B.
, p. 6307 - 6321 (2008/10/08)
A series of Cu(I) and Cu(II) complexes of a variety of β-diketiminate ligands (L-) with a range of substitution patterns were prepared and characterized by spectroscopic, electrochemical, and, in several cases, X-ray crystallographic methods. Specifically, complexes of the general formula [LCuCl]2 were structurally characterized and their magnetic properties assessed through EPR spectroscopy of solutions and, in one instance, by variable-temperature SQUID magnetization measurements on a powder sample. UV-vis spectra indicated reversible dissociation to 3-coordinate monomers LCuCl in solution at temperatures above -55°C. The Cu(I) complexes LCu(MeCN) exhibited reversible Cu(I)/Cu(II) redox couples with E1/2 values between +300 and +520 mV versus NHE (cyclic voltammetry, MeCN solutions). These complexes were highly reactive with O2, yielding intermediates that were identified as rare examples of neutral bis(μ-oxo)dicopper complexes on the basis of their EPR silence, diagnostic UV-vis absorption data, and O-isotope-sensitive resonance Raman spectroscopic features. The structural features of the compounds [LCuCl]2 and LCu(MeCN) as well as the proclivity to form bis(μ-oxo)dicopper products upon oxygenation of the Cu(I) complexes are compared to data previously reported for complexes of more sterically hindered β-diketiminate ligands (Aboelella, N. W.; Lewis, E. A.; Reynolds, A. M.; Brennessel, W. W.; Cramer, C. J.; Tolman, W. B. J. Am. Chem. Soc. 2002, 124, 10600. Spencer, D. J. E.; Aboelella, N. W.; Reynolds, A. M.; Holland, P. L.; Tolman, W. B. J. Am. Chem. Soc. 2002, 124, 2108. Holland, P. L.; Tolman, W. B. J. Am. Chem. Soc. 1999, 121, 7270). The observed structural and reactivity differences are rationalized by considering the steric influences of both the substituents on the flanking aromatic rings and those present on the β-diketiminate backbone.
