The crystal structure and electronic properties of the bis(1,3-dimethyl-5-diazophenyl-6-amino uracilato) copper(II) complex, dimethyl sulfoxide solvate - a new pseudotetrahedral CuN4 complex

Ravichandran, V.; Chacko, K. K.; Aoki, Akihiro; Yamazaki, Hiroshi; Ruiz-Sánchez, J.; Saurez-Verela, J.; López-González, J. de D.; Salas-Peregrín, J.M.; Colacio-Rodríguez, E.

doi:10.1016/s0020-1693(00)91061-2

Cited by 19 publications

(5 citation statements)

References 37 publications

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“…The reflectance diffuse spectrum shows a very broad and intense band centered around 19 000 cm -1 , characteristic of a CuN 4 chromophore with the metal ion in a distorted square-planar arrangement . A linear correlation between the dihedral angle with the highest energy d−d transition in the electronic spectra of some CuN 4 chromophores has been reported . From this correlation the maximum for a CuN 4 chromophore is at 19 960 cm -1 for a regular square-planar geometry.…”

Section: Resultsmentioning

confidence: 86%

Spectroscopic, Magnetic, and Electrochemical Studies of a Dimeric N-Substituted-Sulfanilamide Copper(II) Complex. X-ray and Molecular Structure of the Cu₂(sulfathiazolato)₄ Complex

et al. 1997

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A copper(II) complex of formula Cu(2)(stz)(4) (stz(-) = sulfathiazolato) has been synthesized and characterized by single-crystal X-ray diffraction. The compound crystallizes in the orthorhombic system, space group P2(1)cn with a = 10.595(7) Å, b = 14.274(3) Å, c = 29.65(1) Å, and Z = 4. The structure consists of dinuclear copper(II) units which contain four sulfathiazolato ligands bridging the metal ions through a nonlinear NCN group. The copper atoms are four-coordinated, the chromophore being CuN(4). The Cu.Cu bond distance is 2.671(2) Å. Magnetic susceptibility data in the temperature range 7-300 K show the occurrence of intramolecular antiferromagnetic coupling with 2J = -61.5 cm(-1). This low exchange energy value has been analyzed and rationalized through extended Hückel calculations. EPR spectra at X- and Q-band frequencies show the signals corresponding to a dinuclear entity, being the zero-field splitting parameter, D = 0.230 cm(-1).

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Section: Resultsmentioning

confidence: 86%

Spectroscopic, Magnetic, and Electrochemical Studies of a Dimeric N-Substituted-Sulfanilamide Copper(II) Complex. X-ray and Molecular Structure of the Cu₂(sulfathiazolato)₄ Complex

et al. 1997

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“…The diffuse reflectance spectra of the two complexes show a very broad and intense band around 500 nm, characteristic of a CuN 4 chromophore with the copper ion in a square planar environment . The electronic spectra of the complexes in CH 3 CN and in acetone display a maximum at ca.…”

Section: Resultsmentioning

confidence: 98%

Functional Superoxide Dismutase Mimics. Structural Characterization and Magnetic Exchange Interactions of Copper(II)−N-Substituted Sulfonamide Dimer Complexes

Cejudo-Marín

Alzuet²,

Ferrer³

et al. 2004

Inorg. Chem.

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Dinuclear copper(II) complexes with N-substituted sulfonamide ligands as superoxide dismutase (SOD) mimics have been investigated. The new N-(thiazol-2-yl)toluenesulfonamide (Htz-tol) and N-(thiazol-2-yl)naphthalenesulfonamide (Htz-naf) ligands have been prepared and structurally characterized. The complexes derived from these ligands, [Cu(2)(tz-tol)(4)] (1) and [Cu(2)(tz-naf)(4)] (2), have been synthesized, and their crystal structure, magnetic properties, and EPR spectra were studied in detail. In both compounds the metal centers are bridged by four nonlinear triatomic NCN groups. The coordination geometry of the coppers in the dinuclear entity of 1 and 2 is distorted square planar with two N-thiazole and two N-sulfonamido atoms. Magnetic susceptibility data show a strong antiferromagnetic coupling, with -2J = 121.3 cm(-1) for compound 1 and -2J = 104.3 cm(-1) for compound 2. The EPR spectra of the polycrystalline samples of compounds 1 and 2 have been measured at the X- and Q-band frequencies at different temperatures. Above 20 K the spectra are characteristic of S = 1 species with zero-field splitting parameter D = 0.230 cm(-1) for compound 1 and 0.229 cm(-1) for compound 2. The EPR parameters are discussed in terms of the known binuclear structures. The complexes exhibit high SOD activity, as shown by the low IC(50) values obtained with the xanthine/xanthine oxidase/NBT assay: 0.13 microM for compound 1; 0.17 microM for compound 2.

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“…The diffuse reflectance spectrum of the complex exhibits a very broad and intense band centred at 506 nm, characteristic of a CuN 4 chromophore with the copper ion in a square planar environment [42]. The electronic spectra of the complex in acetone and in acetonitrile display a maximum at 493 nm.…”

Section: Spectroscopic Propertiesmentioning

confidence: 98%

DNA cleavage reaction induced by dimeric copper(II) complexes of N-substituted thiazole sulfonamides

Cejudo

Alzuet

González‐Álvarez

et al. 2006

Journal of Inorganic Biochemistry

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The crystal structure and electronic properties of the bis(1,3-dimethyl-5-diazophenyl-6-amino uracilato) copper(II) complex, dimethyl sulfoxide solvate - a new pseudotetrahedral CuN4 complex

Cited by 19 publications

References 37 publications

Spectroscopic, Magnetic, and Electrochemical Studies of a Dimeric N-Substituted-Sulfanilamide Copper(II) Complex. X-ray and Molecular Structure of the Cu₂(sulfathiazolato)₄ Complex

Spectroscopic, Magnetic, and Electrochemical Studies of a Dimeric N-Substituted-Sulfanilamide Copper(II) Complex. X-ray and Molecular Structure of the Cu₂(sulfathiazolato)₄ Complex

Functional Superoxide Dismutase Mimics. Structural Characterization and Magnetic Exchange Interactions of Copper(II)−N-Substituted Sulfonamide Dimer Complexes

DNA cleavage reaction induced by dimeric copper(II) complexes of N-substituted thiazole sulfonamides

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The crystal structure and electronic properties of the bis(1,3-dimethyl-5-diazophenyl-6-amino uracilato) copper(II) complex, dimethyl sulfoxide solvate - a new pseudotetrahedral CuN4 complex

Cited by 19 publications

References 37 publications

Spectroscopic, Magnetic, and Electrochemical Studies of a Dimeric N-Substituted-Sulfanilamide Copper(II) Complex. X-ray and Molecular Structure of the Cu2(sulfathiazolato)4 Complex

Spectroscopic, Magnetic, and Electrochemical Studies of a Dimeric N-Substituted-Sulfanilamide Copper(II) Complex. X-ray and Molecular Structure of the Cu2(sulfathiazolato)4 Complex

Functional Superoxide Dismutase Mimics. Structural Characterization and Magnetic Exchange Interactions of Copper(II)−N-Substituted Sulfonamide Dimer Complexes

DNA cleavage reaction induced by dimeric copper(II) complexes of N-substituted thiazole sulfonamides

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Spectroscopic, Magnetic, and Electrochemical Studies of a Dimeric N-Substituted-Sulfanilamide Copper(II) Complex. X-ray and Molecular Structure of the Cu₂(sulfathiazolato)₄ Complex

Spectroscopic, Magnetic, and Electrochemical Studies of a Dimeric N-Substituted-Sulfanilamide Copper(II) Complex. X-ray and Molecular Structure of the Cu₂(sulfathiazolato)₄ Complex