Synthesis, characterisation and modelling of a ferromagnetically coupled chromium(III) Dimer: Di-μ-hydroxobis[tetrakis(isothiocyanato)chromate(III)]
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Synthesis, characterisation and modelling of a ferromagnetically coupled chromium(III) Dimer : Di-μ-hydroxobis[tetrakis(isothiocyanato)chromate(III)]. / Morsing, Thorbjørn Juul; Weihe, Høgni; Bendix, Jesper.
I: European Journal of Inorganic Chemistry, Bind 2014, Nr. 35, 2014, s. 5990-5996.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Synthesis, characterisation and modelling of a ferromagnetically coupled chromium(III) Dimer
T2 - Di-μ-hydroxobis[tetrakis(isothiocyanato)chromate(III)]
AU - Morsing, Thorbjørn Juul
AU - Weihe, Høgni
AU - Bendix, Jesper
PY - 2014
Y1 - 2014
N2 - A rare example of a ferromagnetically coupled dinuclear chromium(III) complex, the di-μ-hydroxobis[tetrakis(isothiocyanato)chromate(III)] anion, is reported. This complex has been synthesised from the oxo-bridged acetonitrile complex [(CH3CN)5CrOCr(NCCH3)5](BF4)4 and isolated as the solvated tetraphenylphosphonium salt, (Ph4P)4[(SCN)4Cr(OH)2Cr(NCS)4]·2CH3CN (1). From magnetometry the coupling constant, J, was determined to be -5.17 cm-1 (in an H = JSA·SB scheme). The X-band EPR spectra were measured in the temperature range 2-305 K and the data were modelled. The spectra, which are very rich, are the first reported for a ferromagnetically coupled Cr-diol, and they allow for detailed modelling that encompasses zero-field splittings (ZFS) and fourth-order spin-Hamiltonian parameters for the coupled system. The structural parameters that determine the magnitude and sign of the exchange coupling were studied with broken-symmetry DFT. These results are discussed in terms of and compared to existing angular overlap model (AOM)-based magneto-structural correlations. This furnishes qualitative as well as quantitative insight into the coupling mechanisms.
AB - A rare example of a ferromagnetically coupled dinuclear chromium(III) complex, the di-μ-hydroxobis[tetrakis(isothiocyanato)chromate(III)] anion, is reported. This complex has been synthesised from the oxo-bridged acetonitrile complex [(CH3CN)5CrOCr(NCCH3)5](BF4)4 and isolated as the solvated tetraphenylphosphonium salt, (Ph4P)4[(SCN)4Cr(OH)2Cr(NCS)4]·2CH3CN (1). From magnetometry the coupling constant, J, was determined to be -5.17 cm-1 (in an H = JSA·SB scheme). The X-band EPR spectra were measured in the temperature range 2-305 K and the data were modelled. The spectra, which are very rich, are the first reported for a ferromagnetically coupled Cr-diol, and they allow for detailed modelling that encompasses zero-field splittings (ZFS) and fourth-order spin-Hamiltonian parameters for the coupled system. The structural parameters that determine the magnitude and sign of the exchange coupling were studied with broken-symmetry DFT. These results are discussed in terms of and compared to existing angular overlap model (AOM)-based magneto-structural correlations. This furnishes qualitative as well as quantitative insight into the coupling mechanisms.
KW - Broken symmetry
KW - Chromium
KW - EPR spectroscopy
KW - Magnetic properties
KW - Thiocyanates
U2 - 10.1002/ejic.201402779
DO - 10.1002/ejic.201402779
M3 - Journal article
AN - SCOPUS:84916232092
VL - 2014
SP - 5990
EP - 5996
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
SN - 1434-1948
IS - 35
ER -
ID: 130690330