Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif
We have synthesised and structurally characterised a new pentanuclear mixed-valent cobalt cluster of formula [CoII3Co III2(OH)2(piv)6(L) 2(H2O)4] (piv = trimethylacetate, H 2L = salicylideneanthranillic acid) from reaction of a dinuclear cobalt pivalate precursor with a Schiff base type ligand under...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_14341948_v_n15_p2561_Lazzarini |
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todo:paper_14341948_v_n15_p2561_Lazzarini2023-10-03T16:14:22Z Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif Lazzarini, I.C. Funes, A.V. Carrella, L. Sorace, L. Rentschler, E. Alborés, P. Cluster compounds Cobalt Density functional calculations EPR spectroscopy Magnetic properties Mixed-valent compounds We have synthesised and structurally characterised a new pentanuclear mixed-valent cobalt cluster of formula [CoII3Co III2(OH)2(piv)6(L) 2(H2O)4] (piv = trimethylacetate, H 2L = salicylideneanthranillic acid) from reaction of a dinuclear cobalt pivalate precursor with a Schiff base type ligand under mild reaction conditions. The core structure can be conveniently described as two fused Co3-μ3-OH triangles with a strict unique sharing vertex point. A complete picture of the magnetic behaviour of this compound is presented. Through combined use of susceptibility, magnetisation, and EPR data as well as broken-symmetry DFT calculations, we have supported the magnetic data that show weak and anisotropic exchange interaction between CoII ions affording an Seff = 1/2 ground state that is not completely isolated from the low-lying excited doublets at low temperature. Under the optimum applied field of 2 kOe, a frequency-dependent out-of-phase susceptibility signal can be observed below 4 K. However, no reliable relaxation rates could be extracted due to the narrow temperature range in which this behaviour was observed. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14341948_v_n15_p2561_Lazzarini |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cluster compounds Cobalt Density functional calculations EPR spectroscopy Magnetic properties Mixed-valent compounds |
| spellingShingle |
Cluster compounds Cobalt Density functional calculations EPR spectroscopy Magnetic properties Mixed-valent compounds Lazzarini, I.C. Funes, A.V. Carrella, L. Sorace, L. Rentschler, E. Alborés, P. Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif |
| topic_facet |
Cluster compounds Cobalt Density functional calculations EPR spectroscopy Magnetic properties Mixed-valent compounds |
| description |
We have synthesised and structurally characterised a new pentanuclear mixed-valent cobalt cluster of formula [CoII3Co III2(OH)2(piv)6(L) 2(H2O)4] (piv = trimethylacetate, H 2L = salicylideneanthranillic acid) from reaction of a dinuclear cobalt pivalate precursor with a Schiff base type ligand under mild reaction conditions. The core structure can be conveniently described as two fused Co3-μ3-OH triangles with a strict unique sharing vertex point. A complete picture of the magnetic behaviour of this compound is presented. Through combined use of susceptibility, magnetisation, and EPR data as well as broken-symmetry DFT calculations, we have supported the magnetic data that show weak and anisotropic exchange interaction between CoII ions affording an Seff = 1/2 ground state that is not completely isolated from the low-lying excited doublets at low temperature. Under the optimum applied field of 2 kOe, a frequency-dependent out-of-phase susceptibility signal can be observed below 4 K. However, no reliable relaxation rates could be extracted due to the narrow temperature range in which this behaviour was observed. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| format |
JOUR |
| author |
Lazzarini, I.C. Funes, A.V. Carrella, L. Sorace, L. Rentschler, E. Alborés, P. |
| author_facet |
Lazzarini, I.C. Funes, A.V. Carrella, L. Sorace, L. Rentschler, E. Alborés, P. |
| author_sort |
Lazzarini, I.C. |
| title |
Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif |
| title_short |
Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif |
| title_full |
Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif |
| title_fullStr |
Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif |
| title_full_unstemmed |
Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif |
| title_sort |
magnetic study of a pentanuclear {co2iiico 3ii} cluster with a bent {coii3} motif |
| url |
http://hdl.handle.net/20.500.12110/paper_14341948_v_n15_p2561_Lazzarini |
| work_keys_str_mv |
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| _version_ |
1807315676065431552 |