Synthesis, structural characterization, and electrochemical behavior of copper(I) complexes of sterically hindered tris(3-tert-butyl- and 3,5-diphenylpyrazolyl)hydroborate ligands

Biomimetic Copper(I)-CO Complexes: A Structural and Dynamic Study of a Calix[6]arene-Based Supramolecular System

“…The only model complexes that exhibit such low values are those derived from nonchelating imidazoles (2059 ± 2067 cm À1 ), [68] or from the anionic tris(pyrazolyl)borate ligand. [57,58,62,63] On the other hand, for complexes obtained with the neutral tris(imidazolyl)methoxymethane (n CO 2080 cm À1 ) [59] and tris(imidazolyl)phosphane (n CO 2083 ± 2086 cm À1 ) [60] tripods, the CO stretches are more energetic. Complexes 4, although structurally very similar to the biological systems, display n CO values that are % 40 cm À1 higher.…”

Highly Efficient Copper‐Mediated Atom‐Transfer Radical Addition (ATRA) in the Presence of Reducing Agent

“…The resonances for H 2 The broadened resonances in the solution 1 H NMR spectra of Cu I (TPMA)Br (260-298 K) in (CD 3 ) 2 CO could be induced by the occurrence of the fluxional processes such as the ligand dissociation, which are well known in copper(I) complexes with nitrogen-containing ligands. [57][58][59] In the case of the tetradentate TPMA ligand, the dissociation and association of the pyridine nitrogen atoms has been proposed in the previous studies, as well as the possibility for the formation of dimers in which each copper(I) ion is ligated with two pyridine nitrogen atoms and one tertiary amine nitrogen atom of a single TPMA and one pyridine nitrogen atom of the second adjacent TPMA ligand. [60,61] The 1 H NMR spectra of Cu I (TPMA)Br in Figure 2 are not consistent with the dimer formation because such coordination environment would result in two chemically inequivalent methylene groups.…”

Dinuclear copper(I) complexes of tris(3,5-dimethylpyrazol-1-yl)methane: Synthesis, structure, and reactivity

“…Model complexes not only provide a better understanding of the biological molecules but also assist in the development of new homogeneous catalysts for selective oxidations under mild conditions and also provide fundamental knowledge in copper(I) coordination chemistry which is necessary for a deeper understanding of copper enzymes. The model structures of some copper(I)-containing proteins were obtained by X-ray crystallography or NMR spectroscopy [6][7][8][9]. In those structures, tris(pyrazolyl)methane, hydrotris(pyrazolyl)borate and other N3 ligand donor sets coordinate to the copper(I) centers are employed because of their facially coordinating ability [6,[8][9][10][11].…”

“…The model structures of some copper(I)-containing proteins were obtained by X-ray crystallography or NMR spectroscopy [6][7][8][9]. In those structures, tris(pyrazolyl)methane, hydrotris(pyrazolyl)borate and other N3 ligand donor sets coordinate to the copper(I) centers are employed because of their facially coordinating ability [6,[8][9][10][11]. Our interest is in developing copper(I) complexes containing nitrogen donor tripodal ligand sets [12], which are very important in bioinorganic chemistry area.…”