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Artículo

Coupled High Spin CoII Ions Linked by Symmetrical Double Hydrogen Bonds: Role of a Slowly Relaxing CuII Impurity in Interrupting the CoII–CoII Exchange Interaction

Pérez, Ana LauraIcon ; Kemmerer, Axel; Rey, Marilin de Los Angeles; Dalosto, Sergio DanielIcon ; Ramos, Carlos Alberto; Passeggi, Mario Cesar GuillermoIcon ; Rizzi, Alberto Claudio; Brondino, Carlos DanteIcon
Fecha de publicación: 11/2018
Editorial: Wiley VCH Verlag
Revista: European Journal of Inorganic Chemistry
ISSN: 1099-0682
e-ISSN: 1434-1948
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Químicas

Resumen

CoII and CuII ions are two paramagnetic transition metal ions showing different relaxation rates (ν), with νCo II >> νCu II. To measure the isotropic exchange constant (J) between high spin CoII ions and between CuII ions and high spin CoII ions, we performed magnetic and EPR measurements complemented with computational calculations on pure trans-diaqua-bis(picolinato-N,O)-cobalt(II) dihydrate (1), on the CuII ion doped compound of 1 (2), and on the CuII ion doped compound in a ZnII matrix isomorphous to 1. The temperature dependence of the CuII EPR resonance lines of 2 induced by the fast relaxing CoII ion host as well as the evaluation of the temperature-independent CoII?CoII and CuII?CoII isotropic exchange interaction are analyzed. We determined an antiferromagnetic interaction [JCo?Co = ?1.07(1) cm?1] associated with a double symmetrical hydrogen bond bridge and another one [|J|Co?Cu = 0.0015(2) cm?1] associated with a double but asymmetrical hydrogen bond bridge, which are in line with the values obtained from computational calculations. This work shows that EPR spectroscopy can advantageously be used to evaluate weak exchange interactions between distinct metal ions with different relaxation rates by using the fact that those metal?metal interactions that broaden the EPR resonance line, which are described by matrices with a trace of zero, are averaged out at high temperatures.
Palabras clave: COBALT , COPPER , EPR SPECTROSCOPY , MAGNETIC PROPERTIES
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)
Identificadores
URI: http://hdl.handle.net/11336/84973
DOI: https://doi.org/10.1002/ejic.201800593
URL: https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/ejic.201800593
Colecciones
Articulos(CCT - SANTA FE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SANTA FE
Citación
Pérez, Ana Laura; Kemmerer, Axel; Rey, Marilin de Los Angeles; Dalosto, Sergio Daniel; Ramos, Carlos Alberto; et al.; Coupled High Spin CoII Ions Linked by Symmetrical Double Hydrogen Bonds: Role of a Slowly Relaxing CuII Impurity in Interrupting the CoII–CoII Exchange Interaction; Wiley VCH Verlag; European Journal of Inorganic Chemistry; 2018; 42; 11-2018; 4604-4613
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