Magnetic Study of a Pentanuclear {Co 2 III Co 3 II } Cluster with a Bent {Co II 3 } Motif

We have synthesised and structurally characterised a new pentanuclear mixed-valent cobalt cluster of formula [CoII3CoIII2(OH)2(piv)6(L)2(H2O)4] (piv = trimethylacetate, H2L = 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 anisot…

{CoIII2DyIII2} single molecule magnet with two resolved thermal activated magnetization relaxation pathways at zero field

The new complex [CoIII2DyIII 2(OMe)2(teaH)2(Piv)6] in the {CoIII2DyIII2} family, shows two well resolved thermal activated magnetization relaxation pathways under AC experiments in zero DC field. Fitted crystal field parameters suggest that the origin of these two pathways relies on two different excited mJ sub-levels. Fil: Funes, Víctor Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina …

Synthesis, structural characterization and magnetic behaviour of a family of [CoIII2LnIII2] butterfly compounds

We have successfully prepared and structurally characterized a family of butterfly-like [Co2 IIILn2 III] complexes where all magnetic properties are due to the Ln(iii) ions. The complexes with Ln = Tb(1), Dy(2), Ho(3), Er(4) and Yb(5) are iso-structural. An exception is the complex with Ln = Gd(6) which strings in a one dimensional chain. The structural similarity together with the high tendency of the crystallites to align under an applied magnetic field allowed an overall DC magnetic data treatment to extract phenomenological crystal field parameters and hence to determine the ground state multiplet energy level splitting. The Dy(iii) member is the only one showing slow relaxation of magn…

Exploring the Slow Relaxation of the Magnetization in CoIII -Decorated {DyIII 2 } Units

We have prepared and structurally characterized a new member of the butterfly-like {CoIII 2DyIII 2} single-molecule magnets (SMMs) through further CoIIIdecoration, with the formula [CoIII 4DyIII 2(OH)2(teaH)2(tea)2(Piv)6] (teaH3=triethanolamine; Piv=trimethylacetate or pivalate). Direct current (DC) susceptibility and magnetization measurements were performed allowing the extraction of possible crystal-field parameters. A simple electrostatic modeling shows reasonable agreement with experimental data. Alternating current (AC) susceptibility measurements under a zero DC field and under small applied fields were performed at different frequencies (i.e., 10–1500 Hz) and at low temperatures (i.…

Single Molecule Magnet Features in the Butterfly [Co III 2 Ln III 2 ] Pivalate Family with Alcohol‐Amine Ligands

Switching nuclearity and Co(II) content through stoichiometry adjustment: {Co(II)6Co(III)3} and {Co(II)Co4(III)} mixed valent complexes and a study of their magnetic properties.

We are reporting two new mixed valent Co(ii)/Co(iii) polynuclear complexes, {Co II 6 Co III 3 } and {Co II Co III 4 }, bearing different amount of Co(ii) ions in their cores, through the employment of the multidentate triethanolamine (teaH 3 ) ligand in different stoichiometric ratios. We present a complete picture of the magnetic behaviour of both complexes through a combined usage of the susceptibility, magnetization and X-band EPR data as well as broken-symmetry DFT calculations. Compound 1 shows an atypical spin-only behaviour, probably due to the presence of four and five coordinated Co(ii) sites as well as highly distorted six coordinated Co(ii) ions, promoting a high degree of orbita…

CCDC 1026942: Experimental Crystal Structure Determination

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CCDC 1489635: Experimental Crystal Structure Determination

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CCDC 1489636: Experimental Crystal Structure Determination

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CCDC 2078695: Experimental Crystal Structure Determination

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CCDC 1026941: Experimental Crystal Structure Determination

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CCDC 958224: Experimental Crystal Structure Determination

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CCDC 2078697: Experimental Crystal Structure Determination

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CCDC 1462510: Experimental Crystal Structure Determination

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CCDC 977362: Experimental Crystal Structure Determination

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CCDC 2078699: Experimental Crystal Structure Determination

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CCDC 2078698: Experimental Crystal Structure Determination

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CCDC 1489634: Experimental Crystal Structure Determination

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CCDC 2078696: Experimental Crystal Structure Determination

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CCDC 1489637: Experimental Crystal Structure Determination

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CCDC 1489638: Experimental Crystal Structure Determination

Related Article: Alejandro V. Funes, Luca Carrella, Yvonne Rechkemmer, Joris van Slageren, Eva Rentschler, Pablo Alborés|2017|Dalton Trans.|46|3400|doi:10.1039/C6DT04713K