Magnetic Susceptibility and EPR Spectra of mu-Cyano-bis[pentaamminechromium(III)] Perchlorate.

Glerup, Jørgen; Weihe, Høgni; Dahlin, Britt-Marie; Dahlman, Olof; Enzell, Curt R.; Pettersson, Tore

doi:10.3891/acta.chem.scand.45-0444

Cited by 97 publications

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“…The EPR spectra were calculated by using a simulation program provided by H. Weihe. [10] A first simulation of the spectra at 285 GHz shows that a slight change in the starting D value, by less than 1 %, may lead to two different signals. Furthermore, preliminary simulations taking into account two different species showed that their relative weight is close to unity.…”

Section: Resultsmentioning

confidence: 99%

Large Magnetic Anisotropy in Pentacoordinate Ni^II Complexes

Rebilly

Charron

Rivière

et al. 2008

Chemistry A European J

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Pentacoordinate complexes in which Ni(II) is chelated by the tridentate macrocyclic ligand 1,4,7-triisopropyl-1,4,7-triazacyclononane (iPrtacn) of formula [Ni(iPrtacn)X(2)] (X=Cl, Br, NCS) have relatively large magnetic anisotropies, revealed by the large zero-field splitting (zfs) axial parameters |D| of around 15 cm(-1) measured by frequency-domain magnetic resonance spectroscopy (FDMRS) and high-field high-frequency electron paramagnetic resonance (HF-HFEPR). The spin Hamiltonian parameters for the three complexes were determined by analyzing the FDMRS spectra at different temperatures in zero applied magnetic field in an energy window between 0 and 40 cm(-1). The same parameters were determined from analysis of HF-HFEPR data measured at different frequencies (285, 380, and 475 GHz) and at 7 and 17 K. The spin Hamiltonian parameters D (axial) and E (rhombic) were calculated for the three complexes in the framework of the angular overlap model (AOM). The nature and magnitude of the magnetic anisotropy of the three complexes and the origin of the influence of the X atoms were analyzed by performing systematic calculations on model complexes.

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Section: Resultsmentioning

confidence: 99%

Large Magnetic Anisotropy in Pentacoordinate Ni^II Complexes

Rebilly

Charron

Rivière

et al. 2008

Chemistry A European J

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“…A simulation program is available from Dr. H. Weihe; for more information see http://sophus.kiku.dk/software/epr/epr.html. [17] Frequency domain magnetic resonance spectroscopic (FDMRS) measurements were performed on a homebuilt spectrometer described in the literature. [18] Spectra were recorded at various temper- Figure 5.…”

Section: à3mentioning

confidence: 99%

Very Large Ising‐Type Magnetic Anisotropy in a Mononuclear Ni^II Complex

et al. 2005

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“…30 Optical absorption spectra of thin polished plates cut from the studied BSO crystals were measured at T = 90 K in a liquid nitrogen cooled optical cryostat using a Varian Cary 5 spectrophotometer. For near UV and red light excitation of the sample inside the cryostat the Kr + -ion laser mentioned above was used as a source.…”

Section: )mentioning

confidence: 99%

A photosensitive Cr3+ center in photorefractive Bi12SiO20 crystals co-doped with chromium and phosphorus

Ahmad

Marinova

Vrielinck

et al. 2011

Journal of Applied Physics

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ABSTRACT:A trigonal Cr 3+ (3d 3 ) defect in sillenite type Bi 12 SiO 20 crystals co-doped with chromium and phosphorus has been identified by means of multi-frequency X-band (9.4 GHz), Q-band (35 GHz) and W-band (94 GHz) electron paramagnetic resonance (EPR). A consistent analysis of the observed spectra and their angular dependence was reached using an S=3/2 spin Hamiltonian with axial symmetry around a <111> crystallographic direction, an isotropic g-value g = 1.983, and a zero field splitting parameter B 2 0 = 0.1950 cm -1 . The spectra are attributed to a chromium ion in the unusual Cr 3+ valence replacing a substitutional Si 4+ in tetrahedral oxygen coordination. Evidence is found that the symmetry lowering from tetrahedral to trigonal is not spontaneous but induced by an associated defect, for which a P 5+ ion in a nearest-neighbor Si 4+ site is the most plausible candidate. Optical excitation results in a reversible charge transfer process directly correlated with a photochromic effect: near-UV light leads to a strong reduction of the Cr 3+ EPR signals, and induces a broad band at 675 nm in the absorption spectrum, and both effects are reversed under red light excitation.

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Magnetic Susceptibility and EPR Spectra of mu-Cyano-bis[pentaamminechromium(III)] Perchlorate.

Cited by 97 publications

References 0 publications

Large Magnetic Anisotropy in Pentacoordinate Ni^II Complexes

Large Magnetic Anisotropy in Pentacoordinate Ni^II Complexes

Very Large Ising‐Type Magnetic Anisotropy in a Mononuclear Ni^II Complex

A photosensitive Cr3+ center in photorefractive Bi12SiO20 crystals co-doped with chromium and phosphorus

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Magnetic Susceptibility and EPR Spectra of mu-Cyano-bis[pentaamminechromium(III)] Perchlorate.

Cited by 97 publications

References 0 publications

Large Magnetic Anisotropy in Pentacoordinate NiII Complexes

Large Magnetic Anisotropy in Pentacoordinate NiII Complexes

Very Large Ising‐Type Magnetic Anisotropy in a Mononuclear NiII Complex

A photosensitive Cr3+ center in photorefractive Bi12SiO20 crystals co-doped with chromium and phosphorus

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Product

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Large Magnetic Anisotropy in Pentacoordinate Ni^II Complexes

Large Magnetic Anisotropy in Pentacoordinate Ni^II Complexes

Very Large Ising‐Type Magnetic Anisotropy in a Mononuclear Ni^II Complex