Tetrahedrally distorted tetragonal copper complexes of a tridentate ligand

Batra, Gita; Mathur, Pavan

doi:10.1021/ic00035a010

Cited by 57 publications

(29 citation statements)

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“…As has been shown in previous papers [1,3], the values of d-d transitions for Cu 2 + ions in phosphate glasses are in the range of 10500-12000 cm -'. These are in agreement with the results reported for some Cu e complexes of tetrahedral configuration [22][23][24][25][26].…”

Section: Discussionsupporting

confidence: 93%

EPR studies of Cu2+ and V4+ ions in phosphate glasses

et al. 1999

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Two lead-phosphate glass systems doped with both copper and vanadium ions in different ratios were studied by EPR (electron paramagnetic resonance) method. EPR spectra and parameters (g = 2.44, gl = 2.08 and A 11 = 117.6. 10 4 cm') obtained for x(CuO • V 2 05)(1-x)[2P2O5 • PbO] glasses with x <-10 mol% suggest a tetrahedral (Td) coordination of Cu e+ ions and not a tetragonally elongated octahedron as has been assumed in previous works. The ground state of the paramagnetic electron is the dzy. copper orbital with a 4p, contribution of 6%. For 20 <-x <-40 mol% a broad line (AB = 307 G) characteristic for clustered ions appears at g = 2.18. The V°+ ions are evidenced only in the spectra of x(Cu0. 2V205)(1-x)[2P205 • PbO] glasses and the resonance parameters suggest a pentacoordinated C 4v local symmetry for these ions. The hyperfine structures characteristic for Cu e+ and V4 ions disappear for 10 -< x <_ 40 mol% due to the mixed exchange Cue'-V4 pair formation in these glasses.

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Section: Discussionsupporting

confidence: 93%

EPR studies of Cu2+ and V4+ ions in phosphate glasses

et al. 1999

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“…5. This observed superhyperfine structure consisting of a 9 line multiplet indicates at least 4 14 N atoms around the copper ion, in an approximately tetragonal crystal field [19], with A NЌ ϭ 14.7 G, and is more detectable at higher pH. Similar results have been described for copper complexes with bis(imidazol-2-yl)-containing ligands [20,21].…”

Section: ϫ3supporting

confidence: 80%

Factorial design analysis of the catalytic activity of di‐imine copper(II) complexes in the decomposition of hydrogen peroxide

Alves

Azzellini

Ferreira

et al. 2001

Int J of Chemical Kinetics

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Factorial design analysis was applied to the study of the catalytic activity of diimine copper(II) complexes, in the decomposition of hydrogen peroxide. The studied complexes show a tridentate imine ligand (apip), derived from 2-acetylpyridine and 2-(2-aminoethyl)pyridine, and a hydroxo or an imidazole group at the fourth coordination site of the copper ion. The factorial design models for both [Cu(apip)imH] 2ϩ and [Cu(apip)OH] ϩ were similar. Increasing the peroxide concentration from 3.2 ϫ 10 Ϫ3 to 8.1 ϫ 10 Ϫ3 mol L Ϫ1 resulted in increased oxygen formation. Increasing the pH from 7 to 11 also increased oxygen formation and had an effect about twice as large as the peroxide one. Both complexes also had an important interaction effect between peroxide concentration and pH. However, increasing the catalyst concentration led to a decrease in total oxygen formation. The obtained results were corroborated by further data, achieved by using the usual univariate method, and helped to elucidate equilibrium steps occurring in the studied systems. In very alkaline solutions, the studied [Cu(apip)imH] 2ϩ complex can form the corresponding dinuclear species, [Cu 2 (apip) 2 im] 3ϩ . While the mononuclear complex proved to be an efficient catalyst in hydrogen peroxide decomposition, the corresponding dinuclear compound seemed to be able to coordinate with the dioxygen molecule, inhibiting its observed release.

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“…Room temperature ESR spectra of both CuLC1 compounds in DMSO solution (10 mg/cm 3) suggest the presence of pseudo-tetrahedral monomeric species similar with those reported in [9,10]. Figure 3 shows the isotropic EPR spectrum of CuL~C1 complex.…”

Section: Resultssupporting

confidence: 64%

ESR study of some Cu(II)-4-substituted-2-Thiazolylhydrazone complexes

David

Cozar

Sumâlan³

et al. 1997

Appl. Magn. Reson.

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The Cu(II) complexes with 2-N-acetyl-salicylidene-hydrazino-4-chlor-methyl thiazole (LI) and 2-N-acetyl salicylidene-hydrazino-4-thiazolyl acetic ester (Ln) were prepared and investigated by ESR measurements. The powder ESR spectnma at room temperature of CuLnC1 is quasi-isotropic (g = = 2.113), while for CuL~C1 is characteristic of monomeric species with axial symmetry (g~~ = 2.234, g~ = 2.073). The isotropic ESR spectra of the CuLC1 compounds in DMSO solution suggest the presence of pseudo-tetrahedral monomeric species. The anisotropic spectra were obtained for adsorbed CuLCI DMSO solutions on NaY zeolite. The parallel hyperfine structure shows the coexistente of two magnetic nonequivalent monomeric species. The estimation of some LCAO-MO coefficients using Kivelson and Neiman's approximation reveals a dominant ionic character for copper-ligand bonds.

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Tetrahedrally distorted tetragonal copper complexes of a tridentate ligand

Cited by 57 publications

References 1 publication

EPR studies of Cu2+ and V4+ ions in phosphate glasses

EPR studies of Cu2+ and V4+ ions in phosphate glasses

Factorial design analysis of the catalytic activity of di‐imine copper(II) complexes in the decomposition of hydrogen peroxide

ESR study of some Cu(II)-4-substituted-2-Thiazolylhydrazone complexes

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