Stabilization of copper(III) complexes by substituted oxamate ligands

Cervera, Beatriz; Sanz, José Luis Graupera; Ibáñez, María; Vila, Gema; Lloret, Francesc; Julve, Miguel; Ruiz, Rafael; Ottenwaelder, Xavier; Aukauloo, Ally; Poussereau, Sandrine; Journaux, Yves; Muñoz, M. Carmen

doi:10.1039/a706964b

Cited by 95 publications

(69 citation statements)

References 11 publications

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“…H 4 [1]: The proligand was prepared in a standard manner [18] from the condensation of 1,3-phenylenediamine and ethyl oxalyl chloride in THF, and was isolated as the diethyl ester derivative (90 %). Elemental analysis calcd (%) for C 14 13 Complex 2 was obtained following a reported procedure [18] (1600), 345 nm (2650).…”

Section: Methodsmentioning

confidence: 99%

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Ferromagnetic Coupling through Spin Polarization in a Dinuclear Copper(II) Metallacyclophane

Fernández

Ruiz

Faus

et al. 2001

Angew. Chem. Int. Ed.

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149

110

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Section: Methodsmentioning

confidence: 99%

“…Elemental analysis calcd (%) for C 14 13 Complex 2 was obtained following a reported procedure [18] (1600), 345 nm (2650). Crystals of 2, well-formed small dark green prisms, suitable for X-ray diffraction were obtained by slow vapor diffusion of methanol into concentrated aqueous solutions of 2 at 5 8C.…”

Section: Methodsmentioning

confidence: 99%

Ferromagnetic Coupling through Spin Polarization in a Dinuclear Copper(II) Metallacyclophane

Fernández

Ruiz

Faus

et al. 2001

Angew. Chem. Int. Ed.

Self Cite

149

110

View full text Add to dashboard Cite

show abstract

“…The UV/VIS spectra of the complexes 1 -3 (1 Â 10 À 3 m) were recorded at 258 in H 2 O. In the UV region, complexes 1 -3 displayed two main transitions: i) an intense band at 325 -340 nm, attributed to ligand-to-metal chargetransfer (LMCT) transitions, and ii) a strong band at 230 -250 nm ascribed to intraligand (IL) charge-transfer transitions [40] [41]. The visible absorption spectrum of complex 1 was characterized by a single high-energy band at 425 nm ( [44].…”

Section: Results Andmentioning

confidence: 99%

Synthesis and Biophysical Studies of Bis‐Macrocyclic Cobalt/Copper(II) Complexes Having a Pyridine Spacer with CT DNA and 5′‐GMP

Arjmand

Aziz

2009

Chemistry & Biodiversity

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New bis-macrocyclic complexes of Co(III), 1, Ni(II), 2, and Cu(II), 3, containing pyridyl bridges between 13-membered macrocyclic subunits, have been synthesized via an in situ one-pot template condensation reaction (IOPTCR). The proposed structures of these new dinuclear complexes are consistent with the data obtained from elemental analysis, molar conductance, IR, EPR, UV/VIS, (1)H- and 13C-NMR, and ESI-MS. The complexes 2 and 3 possess square-planar geometry with four secondary N-atoms coordinated to the metal ion, while complex 1 reveals octahedral geometry in solution due to coordinated H(2)O molecules. DNA-Binding properties of the complexes 1 and 3 were investigated by absorption and emission titrations, cyclic voltammetry, and viscosity measurements. Complexes 1 and 3 are strong DNA binders with binding constants, K(b), of 1.64 x 10(5) and 2.05 x 10(5) M(-1), respectively. Hyperchromism, decrease in emission intensity of DNA-bound ethidium bromide (EB), and changes observed in the viscosity and cyclic voltammograms in the presence of added metal complexes reveals that the complexes bind to DNA predominantly by electrostatic attraction, substantiated by absorption titration with 5'-GMP.

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“…Macrocycles with 14-membered rings and above having non-rigid exocyclic substituents [7] usually have flexible cavity, which is effectively capable of encapsulating metal ions stabilizing the complexes in low as well as high oxidation states. Cyclic ligands having amide nitrogen coordination sites like that in oligopeptides [2][3][4], oxamide [8][9][10] and oxamates [10,11] etc., usually bind metal ions through nitrogen atoms of the deprotonated amide groups. These ligands exhibit tendency to stabilize complexes where metal ions are usually in their higher ( +3 and above) oxidation states.…”

Section: Introductionmentioning

confidence: 99%

Spectral and electro-chemical characterization of transition metal complexes of a modified [N6] macrocycle. A mimic to cyclic hexapeptide

Siddiqi

Khalid

Kumar

2007

Transition Met Chem

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The 16-membered modified [N 6 ] macrocylic ligand (L), a mimic to cyclic, hexapeptide is reacted with MCl 2 and MCl 3 resulting in complexes with stoichiometrices [MLCl 2 ] (M = Cr, Mn, Co, Ni, Cu), [MLCl 3 ] (M = Pt, Pd) and [MLCl 2 ]Cl (M = Fe, Ru). Its reactions with the precursors [M(Ph 3 P) 2 Cl 2 ] (M = Co, Ni, Pt, Pd) follow a ligand displacement path affording the final products which do not contain coordinated Ph 3 P. Complexes have been characterized from results of elemental analyses, conductometric, magnetic susceptibility, i.r. and u.v.-vis (ligand field) spectral studies. Magnetic susceptibility and ligand field spectral data are consistent with a hexacoordinate geometry for Cr 2+ , Mn 2+ , Fe 3+ , Co 2+ , Ni 2+ and Cu 2+ and four coordinate square-planar geometry for Pt 2+ and Pd 2+ . Molecular orbital computations using CSChem ultra MOPAC software for an optimized minimum energy plot of the structure shows that the ligand binds metal ions as a tetradentate (N,N,N,N) chelating agent. Cyclic voltammetric studies indicate formation of stable reversible or quasi-reversible redox couples in solutions, which corroborates a kinetic stability of these complexes in their variable oxidation states.

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Stabilization of copper(III) complexes by substituted oxamate ligands

Cited by 95 publications

References 11 publications

Ferromagnetic Coupling through Spin Polarization in a Dinuclear Copper(II) Metallacyclophane

Ferromagnetic Coupling through Spin Polarization in a Dinuclear Copper(II) Metallacyclophane

Synthesis and Biophysical Studies of Bis‐Macrocyclic Cobalt/Copper(II) Complexes Having a Pyridine Spacer with CT DNA and 5′‐GMP

Spectral and electro-chemical characterization of transition metal complexes of a modified [N6] macrocycle. A mimic to cyclic hexapeptide

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