Field-induced slow magnetic relaxation in mixed valence di- and tri-nuclear CoII–CoIII complexes

2020 ◽  
Vol 49 (27) ◽  
pp. 9516-9528 ◽  
Author(s):  
Aparup Paul ◽  
Marta Viciano-Chumillas ◽  
Horst Puschmann ◽  
Joan Cano ◽  
Subal Chandra Manna
Keyword(s):  
Low Temperature ◽  
Single Crystal ◽  
Magnetic Relaxation ◽  
Mixed Valence ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
X Ray ◽  
Slow Magnetic Relaxation

Two novel mixed valence di/tri nuclear CoII–CoIII complexes were synthesized and characterized by single crystal X-ray diffraction. Magnetic studies at low temperature revealed that both complexes show slow magnetic relaxation.

Goblet-shaped pentanuclear lanthanide clusters assembled with a cyclen derivative ligand exhibiting slow magnetic relaxation

2016 ◽  
Vol 45 (32) ◽  
pp. 12734-12738 ◽  
Author(s):  
Gaoji Wang ◽  
Yongqin Wei ◽  
Kechen Wu
Keyword(s):  
Single Crystal ◽  
Magnetic Relaxation ◽  
Magnetic Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Slow Magnetic Relaxation ◽  
Ferromagnetic Interactions

Two goblet-shaped 5Ln clusters have been assembled. Single-crystal X-ray diffraction studies reveal that both compounds feature a novel homometallic appended cubane geometry. The magnetic study on 1 suggests the presence of anti-ferromagnetic interactions, whereas 2 exhibits SMM behavior.

Two types of Ln2Cu2 hydroxo-trimethylacetate complexes with 0D and 1D motifs: synthetic features, structural differences, and slow magnetic relaxation

2021 ◽  
Author(s):  
Anna Bovkunova ◽  
Evgeniya S. Bazhina ◽  
Igor Evstifeev ◽  
Yulia V. Nelyubina ◽  
Maxim Shmelev ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
X Ray Diffraction ◽  
Metal Core ◽  
X Ray ◽  
Trimethylacetate Complexes ◽  
Structural Differences ◽  
Slow Magnetic Relaxation ◽  
New Compounds

Two series of heterometallic LnIII−CuII compounds containing a butterfly-like tetranuclear metal core were synthesized and characterized by X-ray diffraction and magnetometry. The structures of the new compounds were shown to...

Die neuen Oxobismutate(III) Cs6Bi4O9, K9Bi5O13 und A2Bi4O7 (A = Rb, Cs) / The New Oxobismutates(III) Cs6Bi4O9, K9Bi5O13 and A2Bi4O7 (A = Rb, Cs)

2002 ◽  
Vol 57 (10) ◽  
pp. 1090-1100
Author(s):  
Franziska Emmerling ◽  
Caroline Röhr
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Alkali Metals ◽  
Mixed Valence ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Mixed Valence Compound

AbstractThe title compounds were synthesized at a temperature of 700 °C via oxidation of elemental Bi with the hyperoxides AO2 or via reaction of the elemental alkali metals A with Bi2O3. Their crystal structures have been determined by single crystal x-ray diffraction. They are dominated by two possible surroundings of Bi by O, the ψ-trigonal-bipyramidal three (B) and the ψ-tetrahedral four (T) coordination. Cs6Bi4O9 (triclinic, spacegroup P1̄, a = 813.82(12), b = 991.60(14), c = 1213.83(18) pm, α = 103.658(2), β = 93.694(3), γ = 91.662(3)°, Z = 2) contains centrosymmetric chain segmentes [Bi8O18]12- with six three- (T) and two four-coordinated (B) Bi(III) centers. K9Bi5O13 (monoclinic, spacegroup P21/c, a = 1510.98(14), b = 567.59(5), c = 2685.6(2) pm, β = 111.190(2)°, Z = 4) is a mixed valence compound with isolated [BivO4]3- tetrahedra and chains [BiIII4O9]6- of two T and two B coordinated Bi. In the compounds A2Bi4O7 (A = Rb/Cs: monoclinic, C2/c, a = 2037.0(3) / 2130.6(12), b = 1285.5(2) / 1301.9(7), c = 1566.6(2) / 1605.6(9) pm, β = 94.783(3) / 95.725(9)°, Z = 8) ribbons [Bi4O6O2/2]2- are formed, which are condensed to form a three-dimensional framework.

The Great Barrier Reef Expedition 1928–29: The crystal structure and occurrence of weddellite, ideally CaC2O4·2.5H2O, from the Low Isles, Queensland

2016 ◽  
Vol 80 (2) ◽  
pp. 399-406 ◽  
Author(s):  
Stuart J. Mills ◽  
Andrew G. Christy
Keyword(s):  
Crystal Structure ◽  
Coral Reef ◽  
Low Temperature ◽  
Great Barrier Reef ◽  
Single Crystal ◽  
Structure Study ◽  
Barrier Reef ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Report

Abstract“Envelope crystals” collected during The Great Barrier Reef Expedition in May 1929 have been studied using low-temperature synchrotron single-crystal X-ray diffraction. The crystals are shown to be weddellite, with the largest content of zeolitic water reported to date. A new H2O site has been located within the crystal structure. Study of the crystals show that the end-member formula for weddellite should be reported as CaC2O4·(2.5 – x)H2O, where 0≤x≤ 0.25, instead of CaC2O4·(2H2O or CaC2O4·(2 + x )H2O. This is also the first report of weddellite occurring in a coral reef.

A system for doing low temperature-high pressure single crystal X-ray diffraction with a synchrotron source

1991 ◽  
Vol 6 (6) ◽  
pp. 379-388 ◽  
Author(s):  
R. LeToullec ◽  
P. Loubeyre ◽  
J. P. Pinceaux ◽  
H. K. Mao ◽  
J. Hu
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Synchrotron Source ◽  
X Ray

scholarly journals Electron localization in a mixed-valence diniobium benzene complex

2015 ◽  
Vol 6 (2) ◽  
pp. 993-1003 ◽  
Author(s):  
Thomas L. Gianetti ◽  
Grégory Nocton ◽  
Stefan G. Minasian ◽  
Nikolas Kaltsoyannis ◽  
A. L. David Kilcoyne ◽  
...  
Keyword(s):  
Single Crystal ◽  
Unpaired Electron ◽  
Mixed Valence ◽  
Metal Center ◽  
Electron Localization ◽  
X Ray Diffraction ◽  
X Ray

One electron oxidation of a neutral diniobium benzene complex leads to a mixed-valence species. Single crystal X-ray diffraction, EPR, L3,2-edge XANES, and DFT indicate that the unpaired electron is localized on one metal center.

A Re-investigation of the Crystal Structure of the Perovskite PbZrO3 by X-ray and Neutron Diffraction

1997 ◽  
Vol 53 (1) ◽  
pp. 135-142 ◽  
Author(s):  
D. L. Corker ◽  
A. M. Glazer ◽  
J. Dec ◽  
K. Roleder ◽  
R. W. Whatmore
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Lead Zirconate ◽  
Conclusive Evidence ◽  
X Rays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Investigations

The crystal structure of the perovskite lead zirconate PbZrO3 has been redetermined using single-crystal X-ray diffraction (Mo Kα radiation, λ = 0.71069 Å). Single-crystal data at 100 K: space group. Pbam, a = 5.884 (1), b = 11.787 (3), c = 8.231 (2) Å, V = 570.85 Å3 with Z = 8, μ = 612.6 cm−1, D x = 8.06 Mg m−3, F(000) = 1168, final R = 0.033, wR = 0.061 over 555 reflections with I > 2σ(I). An investigation is made into previous contradicting reports of a possible disorder in the O atoms and their origin by examining the crystal pseudo-symmetry. Information distinguishing an ordered and disordered oxygen substructure is shown to reside in weak l odd reflections. Because of their extremely low intensities these reflections have not contributed sufficiently in previous X-ray structure investigations and hence, to date, conclusive evidence differentiating between ordered and disordered models has not been possible. By collecting single-crystal X-ray data at low temperature and by using exceptionally long scans on selected hkl, l odd, reflections, a new accurate structure determination is presented and discussed, showing the true ordered oxygen positions. Because of the large difference in scattering factors between lead and oxygen when using X-rays, a neutron diffraction Rietveld refinement using polycrystalline samples (D1A instrument, ILL, λ = 1.90788 Å) is also reported as further evidence to support the true ordered oxygen structure revealed by the low-temperature X-ray analysis.

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