Stability, electronic spectra, and structure of the copper(II) chloride complexes in N,N-dimethylformamide

Electron Transfer by Copper Centers

“…It is worth noting, however, that in this medium of extremely high chloride concentration both oxidation states are probably coordinatively saturated by four chloride ions and Cu II Cl 4 2-ion is one of the few low-molecular-weight Cu(II) complexes that is known to be tetrahedral. [72][73][74] Since both oxidation states are likely to be tetrahedral in McConnell and Weaver's study, a small FranckCondon barrier is to be expected. Thus, even in the absence of chloride bridging, the self-exchange rate constant for this redox couple might be exceptionally large.…”

Interfacial Behavior and Film Patterning of Redox‐Active Cationic Copper(II)‐Containing Surfactants

“…2 ] 0 (S = solvent) are expected to be square planar, but tend to be tetrahedral in solvents with high dielectric constants and high donor number, such as acetonitrile. [37,38] Similarly, the presence of PF 6 À counterions leads to distorted planar geometry in environments with similar denticity and structure as those of L PyC 16 and L PyC 18 . [39] Therefore, 1 and 5 deviate considerably from the expected square planar geometry, both as solids (see the structural data) and in solution.…”

Laser-induced copper deposition from aqueous and aqueous–organic solutions: state of the art and prospects of research

“…Moreover, in the general case, the reducing agent is not a necessary component of the solution for a laser-induced process, and the ligand can act as the reducing agent and simultaneously participate in complexation and, vice versa, components with strong coordinating ability are the best reducing agents. 47,48 The copper reduction in solutions which do not contain a component acting as a reducing agent was described by Ahrland and Tagesson. 35 It should be noted that the application of alternative methods (chemical or electrochemical) for performing this reaction was not described in the literature.…”

“…Besides, as can be seen in Table 2, the use of non-aqueous solvents results in a change from the octahedral (4+2) coordination to the tetrahedral environment of the copper ion, which, as mentioned above, reduces endothermic effects associated with the desolvation and facilitates the reduction of the metal. 47,48,72,73 The shape of the coordination polyhedron (the geometry of the environment) of the copper ion in halide complexes in water and in some non-aqueous solvents (see Table 2) was determined from the results of molecular absorption spectroscopy (electronic absorption spectroscopy). 23, 25, 29, 31, 33, 74 ± 84 In some cases, there is no consensus on the shape of the coordination polyhedron of the copper ion in solution probably due to the difference in the experimental conditions used (different supporting ions, concentrations).…”

“…This is in complete agreement with the experimental data on the topology and electrical conductivity of copper deposits obtained by laserinduced reduction. 47,48,90 As mentioned above, the use of organic solvents should be favourable for the reduction of copper. However, aqueous solutions undoubtedly have considerable advantages, such as low cost, the ease of regeneration and environmental safety.…”