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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00201669_v37_n15_p3698_Cukiernik |
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todo:paper_00201669_v37_n15_p3698_Cukiernik2023-10-03T14:16:48Z Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties Cukiernik, F.D. Luneau, D. Marchon, J.-C. Maldivi, P. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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. |
| format |
JOUR |
| author |
Cukiernik, F.D. Luneau, D. Marchon, J.-C. Maldivi, P. |
| spellingShingle |
Cukiernik, F.D. Luneau, D. Marchon, J.-C. Maldivi, P. Mixed-Valent Diruthenium Long-Chain Carboxylates. 2. Magnetic Properties |
| author_facet |
Cukiernik, F.D. Luneau, D. Marchon, J.-C. Maldivi, P. |
| author_sort |
Cukiernik, F.D. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_00201669_v37_n15_p3698_Cukiernik |
| work_keys_str_mv |
AT cukiernikfd mixedvalentdirutheniumlongchaincarboxylates2magneticproperties AT luneaud mixedvalentdirutheniumlongchaincarboxylates2magneticproperties AT marchonjc mixedvalentdirutheniumlongchaincarboxylates2magneticproperties AT maldivip mixedvalentdirutheniumlongchaincarboxylates2magneticproperties |
| _version_ |
1807320575140429824 |