482322-39-4Relevant academic research and scientific papers
Magnetoactive binuclear copper(II) complexes based on β- aminovinylimines
Uraev,Ikorskii,Bubnov,Lysenko,Vlasenko,Borodkina,Borodkin,Garnovskii,Garnovskii
, p. 287 - 296 (2006)
β-Aminovinylimines containing bulky substituents at the donor nitrogen atoms and copper(II) chelates based on them were synthesized. The compounds were studied by single crystal and powder X-ray diffraction, EXAFS, NMR, EPR, and UV/Vis spectroscopy, and magnetochemistry. The complexes with halide bridges exhibit a ferromagnetic type of spin-spin interaction. The metal chelate containing a phenyl substituent in the γ-position of the aminovinylimino ligand absorbs atmospheric oxygen in a methylene dichloride solution, which gives rise to a dimer with oxygen bridges exhibiting an antiferromagnetic type of spin-spin interaction. Pleiades Publishing, Inc., 2006.
β-diketiminate ligand backbone structural effects on Cu(I)/O2 reactivity: Unique copper-superoxo and Bis(μ-oxo) complexes
Spencer, Douglas J.E.,Aboelella, Nermeen W.,Reynolds, Anne M.,Holland, Patrick L.,Tolman, William B.
, p. 2108 - 2109 (2007/10/03)
Copper(I) and -(II) complexes of β-diketiminate ligands with identical flanking 2,6-diisopropylphenyl groups but divergent backbone substitution patterns were prepared and structurally characterized, and reactions of the Cu(I) species with O2 a
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.
