807613-96-3Relevant academic research and scientific papers
Identification and characterization of monoanionic tripodal tetradentate ligand complexes of copper(I) and copper(II) involved in halogen atom transfer reactions
Goodwin, Jocelyn M.,Olmstead, Marilyn M.,Patten, Timothy E.
, p. 14352 - 14353 (2004)
The copper(I) complex of bis-(2-(2-pyridyl)-ethyl)-(2-(N-p-toluenesulfonamido)-ethyl)amine (PETAEA), a monoanionic, tripodal tetradentate ligand, was prepared, characterized, and shown to be an effective catalyst for atom transfer radical polymerization (ATRP). A model atom transfer reaction of Cu(PETAEA) with 1-phenylethyl bromide and TEMPO radical trapping agent was studied. The copper(II) complex formed in this reaction was identified by comparison of its spectroscopic data with that of Cu(PETAEA)Br prepared by an independent synthesis. Kinetic and spectroscopic data indicated that the reaction mechanism involved simple atom transfer from the alkyl halide to the Cu(PETAEA) to form the Cu(PETAEA)Br, and no other intermediates were involved. The solid-state structures of the copper(I) and (II) complexes appeared to be maintained in solution, so this system is an atom transfer reaction in which all of the reactive species are identified and characterized. Copyright
Asymmetric dinuclear copper(i) complexes of bis-(2-(2-pyridyl)ethyl)-2-(N- toluenesulfonylamino)ethylamine with short copper-copper distances
Goodwin, Jocelyn M.,Chiang, Pin-Chieh,Brynda, Marcin,Penkina, Katerina,Olmstead, Marilyn M.,Patten, Timothy E.
, p. 3086 - 3092 (2008/02/09)
Addition of two equivalents of CuCl to deprotonated bis-(2-(2-pyridyl) ethyl)-2-(N-toluenesulfonylamino)ethylamine (PETAEA) and its derivatives yielded new types of dinuclear Cu(i) complexes, Cu(-PETAEA)CuCl, Cu(-PEMAEA)CuCl, and Cu(-PENAEA)CuCl (PEMAEA is the 4-methoxyphenyl derivative of PETAEA and PENAEA is the 4-nitrophenyl derivative), exhibiting a four coordinate N4Cu center, a two coordinate NCuCl center, and a metal-metal distance within the range of 2.6572(8) to 2.6903(3) A. Analysis of the covalent radii for four coordinate and two coordinate copper(i), the acute copper-nitrogen-copper angles, and density functional theory (DFT) calculations suggest a weak attraction between the two copper atoms. The complexes apparently formed in a two-step process with the formation of the tetracoordinate mononuclear complex preceding the coordination of a second equivalent of CuCl to the lone pair of the sulfonamidate ligand. The Royal Society of Chemistry.
