Structural and magnetic characterization of .mu.-hydroxobis[pentaamminechromium(III)] chloride monohydrate, the acid rhodo chloride complex

Veal, Jack T.; Jeter, David Y.; Hempel, Judith C.; Eckberg, Richard P.; Hatfield, William E.; Hodgson, Derek J.

doi:10.1021/ic50130a037

Cited by 55 publications

(22 citation statements)

References 2 publications

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“…The compound [(NH 3 ) 5 CrOHCr(NH 3 ) 5 ]Cl 5 ·H 2 O was characterized by X-ray diffraction, EPR, and magnetic susceptibility measurements (Veal et al, 1973). The material crystallizes in the tetragonal space group P4 2 /mnm with four formula units in a cell of dimensions a = 16.259(7)Å and c = 7.411(7)Å.…”

Section: Structural and Magnetic Characterizationmentioning

confidence: 99%

Magnetic Cluster Excitations

Fürrer

2010

Int. J. Mod. Phys. B

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Magnetic clusters, i.e., assemblies of a finite number (between two or three and several hundred) of interacting spin centers which are magnetically decoupled from their environment, can be found in many materials ranging from inorganic compounds, magnetic molecules, artificial metal structures formed on surfaces to metalloproteins. The magnetic excitation spectra in them are determined by the nature of the spin centers, the nature of the magnetic interactions, and the particular arrangement of the mutual interaction paths between the spin centers. Small clusters of up to four magnetic ions are ideal model systems to examine the fundamental magnetic interactions which are usually dominated by Heisenberg exchange, but often complemented by anisotropic and/or higher-order interactions. In large magnetic clusters which may potentially deal with a dozen or more spin centers, the possibility of novel many-body quantum states and quantum phenomena are in focus. In this review the necessary theoretical concepts and experimental techniques to study the magnetic cluster excitations and the resulting characteristic magnetic properties are introduced, followed by examples of small clusters demonstrating the enormous amount of detailed physical information which can be retrieved. The current understanding of the excitations and their physical interpretation in the molecular nanomagnets which represent large magnetic clusters is then presented, with an own section devoted to the subclass of the singlemolecule magnets which are distinguished by displaying quantum tunneling of the magnetization. Finally, some quantum many-body states are summarized which evolve in magnetic insulators characterized by built-in or field-induced magnetic clusters. The review concludes addressing future perspectives in the field of magnetic cluster excitations.

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Section: Structural and Magnetic Characterizationmentioning

confidence: 99%

Magnetic Cluster Excitations

Fürrer

2010

Int. J. Mod. Phys. B

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“…the orbital describing unpaired electron) via the nonlinear O-P-O bridging moieties, which is also associated with the bulky phenyl group. To obtain the nature and extent of the coupling between the magnetic centers we have fitted our data with the Bleaney-Bower equation for an isolated spin dimmer of S¼3/2 using the exchange Hamiltonian Ĥ¼ À2 JS 1 S 2 , giving the molar susceptibility of the dimer corresponding to the Heisenberg exchange [40,41]:…”

Section: Magnetic Propertymentioning

confidence: 99%

Organic–inorganic hybrid supermicroporous chromium oxophenylphosphate with magnetic and catalytic properties

Pal

Pramanik

Seikh

et al. 2014

Journal of Magnetism and Magnetic Materials

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“…Jab=0"069 meV) [6] is very interesting. Of course it has to be borne in mind that the optical and magnetic studies were carried out with undeuterated samples.…”

Section: H U Gtidel and A Furrermentioning

confidence: 99%

“…The acid rhodo chromium(III) complex has been known for nearly 100 years [5] and its ground-state properties have been well established using both magnetic [6] and optical spectroscopic methods [2]. From X-ray work it is known that the CrOCr unit is bent with an angle at the oxygen atom of approximately 166 ~ and a Cr-O distance of 1.94 A [6]. This complex is attractive as a model system to test the usefulness of the method for two main reasons.…”

Section: Hu Gtidel and A Furrermentioning

confidence: 99%

“…The energy splitting in the ground state of the acid rhodo chromium(Ill) complex has been described using a hamiltonian of the form [2,6] nex = Jab(~a 9 "~b) --Jab(~a 9 ~b) 2" (4) 2"3 Energy loss 3-7 + 0"3 7"6 + 0"3 --140 1 "6 Energy loss 3"7 + 0"4 7"3 _+ 0"4 10"8 + 0"6 140 2"3 Energy loss 3-8 + 0"5 7"4 +_ 0.6 10"9 +_ 0"4 45 1"6 Energy gain 3.6 + 0"3 ----140 1"6 Energy gain 3"8 + 0"3 7.4 _+ 0"5 --290 1 "6 Energy gain 3"5 + 0"4 7"1 + 0. …”

Section: Energies Of Ground-state Levelsmentioning

confidence: 99%

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Neutron inelastic scattering study of exchange interactions in a chromium(III) dimer: μ-hydroxo-bis[pentaamminechromium-(III)] chloride monohydrate

Güdel

Furrer²

1977

Molecular Physics

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Neutron inelastic scattering is introduced as a new experimental technique for the study of exchange interactions in polynuclear transition metal complexes. Measurements were performed on deuterated /~-hydroxo-bis-[pentaamminechromium(I I I)]chloride monohydrate at temperatures ranging from 5 K to 290 K. Transitions between split levels of the electronic ground state were observed in both energy-gain and energy-loss configurations. The values for the splittings and the resulting exchange parameters are found to be temperature dependent. Comparisons are made with values obtained from optical spectroscopic studies and magnetic susceptibility measurements. The observed intensity ratios of the neutron inelastic scattering transitions are in good agreement with values calculated on the basis of a simple spinspin coupling model for the chromium pair.

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Structural and magnetic characterization of .mu.-hydroxobis[pentaamminechromium(III)] chloride monohydrate, the acid rhodo chloride complex

Cited by 55 publications

References 2 publications

Magnetic Cluster Excitations

Magnetic Cluster Excitations

Organic–inorganic hybrid supermicroporous chromium oxophenylphosphate with magnetic and catalytic properties

Neutron inelastic scattering study of exchange interactions in a chromium(III) dimer: μ-hydroxo-bis[pentaamminechromium-(III)] chloride monohydrate

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