Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study

We report powder EPR measurements at 9.48 GHz and temperatures of 4 K ≤ T ≤ 300 K and at 33.86 GHz and T = 300 K for the polymeric compound {[Cu 2Er2(L)10(H2O)4].3H 2O)n (HL = frans-2-butenoic acid) having alternate Cu 2 and Er2 dinuclear units bridged by carboxylates along a chain. Above 70 K, when...

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Detalles Bibliográficos
Publicado: 2009
Materias:
Antiferromagnetics
Dinuclear units
EPR measurements
EPR studies
Excited triplet state
G factors
G-values
Polymeric compounds
Singlet ground state
Spin carriers
Unobservable
Zero-field splitting parameters
Antiferromagnetism
Carboxylation
Crystal structure
Electron resonance
Electron spin resonance spectroscopy
Erbium
Paramagnetic resonance
Quantum theory
Spin dynamics
Erbium compounds
carboxylic acid
copper
erbium
chemistry
electron spin resonance
letter
magnetism
temperature
Carboxylic Acids
Copper
Electron Spin Resonance Spectroscopy
Magnetics
Temperature
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v113_n31_p8830_Calvo
http://hdl.handle.net/20.500.12110/paper_10895639_v113_n31_p8830_Calvo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_10895639_v113_n31_p8830_Calvo2023-06-08T16:06:25Z Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study Antiferromagnetics Dinuclear units EPR measurements EPR studies Excited triplet state G factors G-values Polymeric compounds Singlet ground state Spin carriers Unobservable Zero-field splitting parameters Antiferromagnetism Carboxylation Crystal structure Electron resonance Electron spin resonance spectroscopy Erbium Paramagnetic resonance Quantum theory Spin dynamics Erbium compounds carboxylic acid copper erbium chemistry electron spin resonance letter magnetism temperature Carboxylic Acids Copper Electron Spin Resonance Spectroscopy Erbium Magnetics Temperature We report powder EPR measurements at 9.48 GHz and temperatures of 4 K ≤ T ≤ 300 K and at 33.86 GHz and T = 300 K for the polymeric compound {[Cu 2Er2(L)10(H2O)4].3H 2O)n (HL = frans-2-butenoic acid) having alternate Cu 2 and Er2 dinuclear units bridged by carboxylates along a chain. Above 70 K, when the ErIII resonance is unobservable and uncoupled from the CuII ions, the spectrum arises from the excited triplet state of antiferromagnetic Cu2 units, decreasing in intensity as T decreases, and disappearing when these units condensate into the singlet ground state. Fit of a model to the spectra at 9.48 and 33.86 GHz and 300 K gives gcu| = 2.379, gcu- = 2.065, DCu = -0.340 cm-1, and ECu ∼ 0 for the g-factors and zero field splitting parameters. From the T dependence of the intensity of the spectrum above 70 K, we obtain Jcu-cu; = -336(11) cm-1 for the intradinuclear exchange interaction. Below 50 K, a spectrum attributed to Er2 units appears, narrows, and resolves as T decreases, due to the increase of the spin-lattice relaxation time T1. The spectrum at 4 K allows calculating g values g1 = 1.489, g2 = 2.163, and g 3 = 5.587 and zero field splitting parameters DEr = -0.237 cm-1 and EEr = 0.020 cm-1. The results are discussed in terms of the properties of the Cu and Er ions, and the crystal structure of the compound. © 2009 American Chemical Society. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v113_n31_p8830_Calvo http://hdl.handle.net/20.500.12110/paper_10895639_v113_n31_p8830_Calvo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antiferromagnetics
Dinuclear units
EPR measurements
EPR studies
Excited triplet state
G factors
G-values
Polymeric compounds
Singlet ground state
Spin carriers
Unobservable
Zero-field splitting parameters
Antiferromagnetism
Carboxylation
Crystal structure
Electron resonance
Electron spin resonance spectroscopy
Erbium
Paramagnetic resonance
Quantum theory
Spin dynamics
Erbium compounds
carboxylic acid
copper
erbium
chemistry
electron spin resonance
letter
magnetism
temperature
Carboxylic Acids
Copper
Electron Spin Resonance Spectroscopy
Erbium
Magnetics
Temperature
spellingShingle Antiferromagnetics
Dinuclear units
EPR measurements
EPR studies
Excited triplet state
G factors
G-values
Polymeric compounds
Singlet ground state
Spin carriers
Unobservable
Zero-field splitting parameters
Antiferromagnetism
Carboxylation
Crystal structure
Electron resonance
Electron spin resonance spectroscopy
Erbium
Paramagnetic resonance
Quantum theory
Spin dynamics
Erbium compounds
carboxylic acid
copper
erbium
chemistry
electron spin resonance
letter
magnetism
temperature
Carboxylic Acids
Copper
Electron Spin Resonance Spectroscopy
Erbium
Magnetics
Temperature
Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study
topic_facet Antiferromagnetics
Dinuclear units
EPR measurements
EPR studies
Excited triplet state
G factors
G-values
Polymeric compounds
Singlet ground state
Spin carriers
Unobservable
Zero-field splitting parameters
Antiferromagnetism
Carboxylation
Crystal structure
Electron resonance
Electron spin resonance spectroscopy
Erbium
Paramagnetic resonance
Quantum theory
Spin dynamics
Erbium compounds
carboxylic acid
copper
erbium
chemistry
electron spin resonance
letter
magnetism
temperature
Carboxylic Acids
Copper
Electron Spin Resonance Spectroscopy
Erbium
Magnetics
Temperature
description We report powder EPR measurements at 9.48 GHz and temperatures of 4 K ≤ T ≤ 300 K and at 33.86 GHz and T = 300 K for the polymeric compound {[Cu 2Er2(L)10(H2O)4].3H 2O)n (HL = frans-2-butenoic acid) having alternate Cu 2 and Er2 dinuclear units bridged by carboxylates along a chain. Above 70 K, when the ErIII resonance is unobservable and uncoupled from the CuII ions, the spectrum arises from the excited triplet state of antiferromagnetic Cu2 units, decreasing in intensity as T decreases, and disappearing when these units condensate into the singlet ground state. Fit of a model to the spectra at 9.48 and 33.86 GHz and 300 K gives gcu| = 2.379, gcu- = 2.065, DCu = -0.340 cm-1, and ECu ∼ 0 for the g-factors and zero field splitting parameters. From the T dependence of the intensity of the spectrum above 70 K, we obtain Jcu-cu; = -336(11) cm-1 for the intradinuclear exchange interaction. Below 50 K, a spectrum attributed to Er2 units appears, narrows, and resolves as T decreases, due to the increase of the spin-lattice relaxation time T1. The spectrum at 4 K allows calculating g values g1 = 1.489, g2 = 2.163, and g 3 = 5.587 and zero field splitting parameters DEr = -0.237 cm-1 and EEr = 0.020 cm-1. The results are discussed in terms of the properties of the Cu and Er ions, and the crystal structure of the compound. © 2009 American Chemical Society.
title Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study
title_short Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study
title_full Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study
title_fullStr Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study
title_full_unstemmed Alternate Cu2 and Er2 spin carriers in a carboxylate-bridged chain: EPR study
title_sort alternate cu2 and er2 spin carriers in a carboxylate-bridged chain: epr study
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v113_n31_p8830_Calvo
http://hdl.handle.net/20.500.12110/paper_10895639_v113_n31_p8830_Calvo
_version_ 1768542279746715648

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