Copper

The synthesis, crystal structures and antimicrobial studies of C‐methyl‐substituted hexaaza macrocycle of Cu(II) having aromatic pendant arm

“…The powder spectra at room temperature was typical for axial-type Cu(II) complex with g || (2.15) > g ⊥ (2.051) > 2.03, suggesting a d x 2 − y 2 ground state that is consistent with a tetragonally distorted octahedral stereochemistry. [66] The absence of any half field signal suggests the presence of only one transition metal ion. The g || < 2.3 indicate a considerable covalent character.…”

The Crystal Structures of two Linearly Polymeric Copper(II) Complexes of 2, 2′-Bipyridine with threefold Glycolato and Oxalato Bridges

“…The room-temperature EPR spectra of polycrystalline samples have no medium-field signals and show axial symmetry, with g ʈ ϭ 2.29 and g Ќ ϭ 2.06 for I, g ʈ ϭ 2.22 and g Ќ ϭ 2.06 for II, and g ʈ ϭ 2.20 and g Ќ ϭ 2.04 for III, values that are typical of copper(II) ions with predominantly tetragonal coordination and a d x 2 -d y 2 ground state [23]. The values of G [ϭ (g ʈ -2)/(g Ќ -2)] lie in the range 3.5-5.0 indicative of probable magnetic exchange [24] of the kind observed in {[Cu(ox)(bipy)]·2.5H 2 O} n , for which G ϭ 4.5.…”

Phenoxyl-copper(II) complexes: models for the active site of galactose oxidase

“…In the visible and near-IR, complexes 1-4 display additional weak d-d transitions typical for square-based pyramidal Cu II complexes [20].…”