Electron Paramagnetic Resonance Spectra of Copper Complexes

Gersmann, H. R.; Swalen, J. D.

doi:10.1063/1.1732450

Cited by 424 publications

(103 citation statements)

References 20 publications

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“…In the LAPNIT and LAPMET the spectra are explained with practically the same values of the SH parameters, which result to be similar to that found for others Cu(II) com- plexes in which the metal is co-ordinated to two nitrogen and two oxygen atoms (5,6). The slight differences found in the values of the SH parameters for the two samples (LAPNIT and LAPMET) can be understood as a consequence of the solvatation effects due to residual solvent molecules.…”

Section: Discussionsupporting

confidence: 81%

Caracterización, mediante espectroscopia EPR, de los catalizadores quirales bis (Oxazolina)-Cu soportados en Laponitas

Alonso¹,

Martínez²,

Garcı́a³

et al. 2000

Bol. Soc. Esp. Ceram. Vidr.

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An Electron Paramagnetic Resonance study of a chiral Bis(oxazoline)-Cu(II) supported in laponite (synthetic hectorite) is presented. It is concluded that the complex is incorporated into the interllamellar space of the clay giving out isolated Cu(II) entities in which the metal is co-ordinated to oxygen or nitrogen atoms with a symmetry practically planar-square, regardless the solvent used. That point out that the chlorine ligands in the complex are exchanged in the incorporation process in agreement with the previous X-ray absorption spectroscopy data, so that the oxygen atoms of the interlayers and clay surface act as counterions. Key words: EPR, Cu(II), chiral catalystsCaracterización, mediante espectroscopia EPR, de los catalizadores quirales bis (Oxazolina)-Cu soportados en Laponitas.Se presenta un estudio mediante Resonancia Paramagnética Electrónica del complejo quiral Bis(oxazolina)-Cu(II) soportado en laponita (hectorita sintética) (libre de hierro. Del mismo se concluye que el complejo se incorpora en el espacio interlamelar de la arcilla dando lugar a entidades de Cu(II) aisladas en las cuales el metal se coordina a átomos de oxígenos y nitrógenos con una simetría prácticamente planocuadrada, independientemente del disolvente empleado. Ello indica, de acuerdo con los datos previos de espectroscopia de absorción de rayos-X, que los ligandos cloruro del complejo son intercambiados en el proceso de incorporación de forma que los oxígenos de la superficie interlaminar y externa de la arcilla actúan como contraiones.

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Section: Discussionsupporting

confidence: 81%

Caracterización, mediante espectroscopia EPR, de los catalizadores quirales bis (Oxazolina)-Cu soportados en Laponitas

Alonso¹,

Martínez²,

Garcı́a³

et al. 2000

Bol. Soc. Esp. Ceram. Vidr.

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“…The ESR spectrum of Cu(dtc)2 has been well studied (32)(33)(34). The use of dtc to measure quantitatively inorganic cupric ions using ESR has been reviewed by Janzen (35).…”

Section: Esr Investigations Of Tetradentate Cupric Complexesmentioning

confidence: 99%

ESR of Copper and Iron Complexes with Antitumor and Cytotoxic Properties

Antholine¹,

Kalyanaraman²,

Petering³

1985

Environmental Health Perspectives

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The relatively few iron and copper metal complexes which have been examined in cells and tissues for their redox properties, radical generation properties, and antitumor activity are discussed for studies which utilized electron spin resonance spectroscopy (ESR). A common property of a number of metal complexes, which include bleomycin, adriamycin, and thiosemicarbazones described in this review, is that they are readily reduced by thiol compounds and oxidized by oxygen or reduced species of oxygen to produce radicals. Structural features ofthese reactions are identified by ESR spectroscopy in model systems and-often in cells. Furthermore, ESR spectroscopy has been most useful to probe the environment of the complexes in cells and to measure the rate of reduction of their oxidized forms. As a result of these studies, it is anticipated that more attention will be given to the exploration of redox-active metal complexes as drugs.

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“…The wavefunctions which describe this complex are taken to be a linear combination of copper d-orbitals and ligand orbitals of the same symmetry species_ The d 2, d , and d 2 2 orbital;; belong to z xy x -y the irreducible representation Ag in the point group C2h and can therefore mix. As a first approximation, however, we have assumed they may be treated separately_ The wavefunctions [6] are:…”

Section: Bonding Parametersmentioning

confidence: 99%

“…The values indicate that the pi bonding to the ring system can play an important role in stabilizing some chelating complexes. Gersmann and Swalen [6] also calculated values for bonding parameters in chelating complexes. In their studies the two in-plane g-values were approximately equal and differences in the optical transitions were used to reach conclusions about the strength of the pi bond.…”

Section: Bonding Parametersmentioning

confidence: 99%