Exchange interactions in a trigonal chromium(III) pair

Riesen, Hans; Güdel, Hans U.

doi:10.1080/00268978700100811

Cited by 35 publications

(36 citation statements)

References 21 publications

(17 reference statements)

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“…Such effects may represent the driving force for the process to occur. The energy differences between differently magnetically coupled states are of the order of 6 meV [26] compatible with our temperature dependent EEL spectra. At higher temperature the two different Cr3+ sites at the surface are statistically occupied, giving rise to a unit mesh typical for a lattice gas.…”

supporting

confidence: 72%

Metal Oxide Surfaces: Electronic Structure and Molecular Adsorption

Freund

1995

Physica Status Solidi (b)

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The surface science of oxides has received considerably less attention than the study of metal surfaces. We review some of our work on structural characterization and electronic structure investigations on oxide surfaces which we prepare as thin oxide films on metallic substrates. This preparation method leads to certain experimental advantages concerning the application of electron spectroscopies on such systems. We discuss molecular adsorption on non-polar and polar surfaces of clean oxides. The influence of metal deposition onto the oxide surfaces and on their properties with respect to adsorption is described. Light induced processes with full quantum state detection of desorbing molecules are addressed. The possibility of studying dynamic processes in adsorbates on oxides via electron spin resonance spectroscopy is evaluated.

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confidence: 72%

Metal Oxide Surfaces: Electronic Structure and Molecular Adsorption

Freund

1995

Physica Status Solidi (b)

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“…Nevertheless, the most accurate determination of an exchange splitting in a spin cluster is the optical spectroscopic work on the [LCr(OH) 3 L] 3 (L 1,4,7-trimethyl-1,4,7-triazacyclononane) dimer. [43] Inelastic neutron scattering had not been used to probe the magnetic excitations in molecular spin clusters until the study on the acid rhodo complex, see Section 3.3. Since then, there have been about one hundred studies of spin clusters using INS.…”

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confidence: 99%

Molecular Spin Clusters: New Synthetic Approaches and Neutron Scattering Studies

et al. 2003

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We review our recent work in the field of molecular spin clusters and single-molecule magnets, showing how inelastic neutron scattering (INS) can be used to determine magnetic exchange interactions and anisotropy splittings. A general introduction to neutron scattering precedes selected examples, building upon the first determination of exchange coupling in a transition metal complex using INS, through anisotropic exchange in cobalt(II) spin clusters to the determination of exchange interactions in a dodecanuclear nickel(II) wheel. The strength of INS for the accurate determination of anisotropy splittings in single-molecule magnets is revealed. Not only can one determine the axial zero-field splitting parameter D, which plays a key role in single-molecule magnet behavior, but also higher-order terms important in understanding the quantum tunneling behavior. Finally, we review two of our synthetic approaches towards new single-molecule magnets based on nickel, manganese, and iron.

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“…7 is that J is considered independent of temperature. This has been shown to be problematic for a bimetallic compound of chromium(III), leading to errors of more than 30% for the J value determined from temperaturedependent measurements (19). Magnetic measurements and optical spectra are expected to be affected in different ways by the temperature dependence of J, causing the discrepancy observed between the two values of J.…”

Section: Discussionmentioning

confidence: 99%

Single-crystal absorption spectroscopy of binuclear complexes of iron(III) and manganese(III) with the μ-oxo-bis(μ-acetato)dimetal core

Pelletier¹,

Reber

1995

Can. J. Chem.

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Single-crystal absorption spectroscopy at variable temperature is used to determine exchange couplings between transition metal centers in both the electronic ground and excited states in two new homobimetallic complexes with the formula [LM(y-O)(y-CH3C02)2ML'](C104)2, where M is iron(II1) or manganese(II1).L and L' denote 1,4,7-triazacyclononane and 1,4,7-trimethyl-l,4,7-triazacyclononane, respectively. Values for the ground state exchange coupling constant J are -295 cm-I and +I0 cm-I for the iron and manganese compounds, respectively, using He, = -JS,.S,. Exchange interactions in excited states are qualitatively analyzed, indicating that a spin-forbidden transition of the Fe-Fe binuclear unit occurs with significant intensity by the single-ion mechanism, and not as expected by the Tanabe pair intensity mechanism for spin-forbidden transitions, the dominant mechanism for isoelectronic complexes of manganese(I1).

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Exchange interactions in a trigonal chromium(III) pair

Cited by 35 publications

References 21 publications

Metal Oxide Surfaces: Electronic Structure and Molecular Adsorption

Metal Oxide Surfaces: Electronic Structure and Molecular Adsorption

Molecular Spin Clusters: New Synthetic Approaches and Neutron Scattering Studies

Single-crystal absorption spectroscopy of binuclear complexes of iron(III) and manganese(III) with the μ-oxo-bis(μ-acetato)dimetal core

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