Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties

The magnetic properties of several mixed-valent diruthenium long-chain carboxylates of general formula Ru2(RCO2)4X (X = Cl, DOS, or RCO2, DOS = dodecyl sulfate, and RCO2 = linear aliphatic carboxylate or dialkoxy- or trialkoxybenzoate) were studied in the temperature range 6-400 K. All of the compou...

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Autor principal: Cukiernik, Fabio Daniel
Publicado: 1998
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00201669_v37_n15_p3698_Cukiernik
http://hdl.handle.net/20.500.12110/paper_00201669_v37_n15_p3698_Cukiernik
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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_00201669_v37_n15_p3698_Cukiernik2023-06-08T14:40:27Z Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties Cukiernik, Fabio Daniel The magnetic properties of several mixed-valent diruthenium long-chain carboxylates of general formula Ru2(RCO2)4X (X = Cl, DOS, or RCO2, DOS = dodecyl sulfate, and RCO2 = linear aliphatic carboxylate or dialkoxy- or trialkoxybenzoate) were studied in the temperature range 6-400 K. All of the compounds exhibit a strong zero-field splitting (D = ca. 75 cm-1), independent of the nature of the axial anion X or of the equatorial substituent R. In the X = RCO2 series an intermolecular antiferromagnetic (AF) interaction zJ = ca. -2 cm-1 was found, whereas in the case of an X = DOS analogue, this interaction is very weak (-0.2 cm-1). The X = Cl series shows three distinct types of interdimer magnetic exchange: very weak, moderate (|zJ| ≈ 2 cm-1), or strong (|zJ| > 10 cm-1). One representative complex in this series, Ru2(C4H9CO2)4Cl, has been structurally characterized by X-ray crystallography. Crystal data: tetragonal system, space group I42d, a = 14.137(3) Å, c = 26.246(5) Å, and Z = 8. Examination of the structures and magnetic behaviors suggests that the AF exchange in this series correlates with the Ru-Cl-Ru intermolecular angle; a qualitative explanation in terms of overlap of magnetic orbitals is proposed. Magnetic susceptibility measurements in the columnar mesophase of the mesomorphic congeners indicate that no significant structural change occurs at the crystal-liquid crystal transition. Fil:Cukiernik, F.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00201669_v37_n15_p3698_Cukiernik http://hdl.handle.net/20.500.12110/paper_00201669_v37_n15_p3698_Cukiernik
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The magnetic properties of several mixed-valent diruthenium long-chain carboxylates of general formula Ru2(RCO2)4X (X = Cl, DOS, or RCO2, DOS = dodecyl sulfate, and RCO2 = linear aliphatic carboxylate or dialkoxy- or trialkoxybenzoate) were studied in the temperature range 6-400 K. All of the compounds exhibit a strong zero-field splitting (D = ca. 75 cm-1), independent of the nature of the axial anion X or of the equatorial substituent R. In the X = RCO2 series an intermolecular antiferromagnetic (AF) interaction zJ = ca. -2 cm-1 was found, whereas in the case of an X = DOS analogue, this interaction is very weak (-0.2 cm-1). The X = Cl series shows three distinct types of interdimer magnetic exchange: very weak, moderate (|zJ| ≈ 2 cm-1), or strong (|zJ| > 10 cm-1). One representative complex in this series, Ru2(C4H9CO2)4Cl, has been structurally characterized by X-ray crystallography. Crystal data: tetragonal system, space group I42d, a = 14.137(3) Å, c = 26.246(5) Å, and Z = 8. Examination of the structures and magnetic behaviors suggests that the AF exchange in this series correlates with the Ru-Cl-Ru intermolecular angle; a qualitative explanation in terms of overlap of magnetic orbitals is proposed. Magnetic susceptibility measurements in the columnar mesophase of the mesomorphic congeners indicate that no significant structural change occurs at the crystal-liquid crystal transition.
author Cukiernik, Fabio Daniel
spellingShingle Cukiernik, Fabio Daniel
Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties
author_facet Cukiernik, Fabio Daniel
author_sort Cukiernik, Fabio Daniel
title Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties
title_short Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties
title_full Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties
title_fullStr Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties
title_full_unstemmed Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties
title_sort mixed-valent diruthenium long-chain carboxylates. 2. magnetic properties
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00201669_v37_n15_p3698_Cukiernik
http://hdl.handle.net/20.500.12110/paper_00201669_v37_n15_p3698_Cukiernik
work_keys_str_mv AT cukiernikfabiodaniel mixedvalentdirutheniumlongchaincarboxylates2magneticproperties
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