Coordination sphere flexibility at copper: chemistry of a unipositive copper(II) macrocycle, [Cu(cyclops)]+

Pentadentate thioether-oxime macrocyclic and quasi-macrocyclic complexes of copper(II) and nickel(II)

“…The five nitrogen superhyperfine lines observed mirror the two nitrogen donors, the coupling constants being similar to those of other tetragonal Cu(II) complexes with N/S donor sets [68]. The replacement of the oxime proton by BF 2 + seems to have little effect on the values of A or g Þ as occurs in some Cu(II) BF 2 macrocyclized oximes [3,69]. The Table 7 Electron spin resonance data Complex BF 2 + -macrocyclization does however seem to play a structural role; replacement of an H-bonded oxime linkage by a covalently bridged BF 2 + oxime causes the donor atoms to become closer to Cu(II), and as a consequence increases the interaction between Cu(II) and the axial donor.…”

“…3-Chloro-2-propanone oxime and 3-chlorobutanone oxime were prepared according to literature procedures [7,17]. Proton NMR spectra were obtained on a Bruker AM250 spectrometer using CDCl 3 as solvent with TMS as internal standard. Electronic spectra were recorded on a Perkin -Elmer Lambda-3 spectrophotometer (solution) or on a Perkin-Elmer 330 spectrophotometer, equipped with an integrating sphere for diffuse reflectance.…”

“…Three d-d transitions are generally observed for hexacoordinate Ni(II) ( 3 T 2g 3 A 2g , 3 T 1g (F) 3 A 2g , and 3 T 1g (P) 3 A 2g ). With donor atoms from row-3 and beyond, the Ni(II) spectra become less straightforward to interpret.…”

Metal-mediated diradical tuning for DNA replication arrest via template strand scission

“…The wealth of information available in the literature regarding the electronic spectra of Cu(II) with N-donor ligands allows for a qualitative analysis of the solution structures via their electronic absorption spectra (43). Ligand field absorption profiles can be used to assess the coordination number/geometry relationship, because square planar complexes display ligand field transitions in the range of 17,000-20,000 cm −1 with decreasing energies as the geometry varies from square planar to octahedral to tetrahedral (44)(45)(46).…”

An electrochemical investigation on mononuclear and dinuclear copper(I) aminocarbonyl complexes

“…Increasing attention is paid to the electrochemistry of copper(I)/copper(II) redox couples of biological relevance (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). However, the electrochemical behaviour of copper (1) derivatives is seldom directly dealt (9,11,13).…”