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...

Descripción completa

Detalles Bibliográficos
Publicado: 2014
Materias:
Cluster compounds
Cobalt
Density functional calculations
EPR spectroscopy
Magnetic properties
Mixed-valent compounds
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14341948_v_n15_p2561_Lazzarini
http://hdl.handle.net/20.500.12110/paper_14341948_v_n15_p2561_Lazzarini
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_14341948_v_n15_p2561_Lazzarini
record_format dspace
spelling paper:paper_14341948_v_n15_p2561_Lazzarini2023-06-08T16:14:28Z Magnetic study of a pentanuclear {co2IIICo 3II} cluster with a bent {coII3} motif 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. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14341948_v_n15_p2561_Lazzarini 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
collection 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
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.
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
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14341948_v_n15_p2561_Lazzarini
http://hdl.handle.net/20.500.12110/paper_14341948_v_n15_p2561_Lazzarini
_version_ 1768543575644045312

Ejemplares similares