Electron Paramagnetic Resonance in Gases

Bleaney, B.

doi:10.1142/9789812816764_0022

Cited by 4 publications

(6 citation statements)

References 22 publications

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“…The measured EPR spectra are presented in Figure 5. All spectra present similar characteristics, with an axial g tensors g‖ around 2.44 and g⊥ = 2.07 values characteristic of Cu(II) ions either in a square pyramidal (complexes (1), (2), and (4)) or a square-planar stereochemistry (complex (3)) as already reported in the literature [46][47][48]. Due to a strong spin-spin exchange interaction, no hyperfine structure is observed at room temperature, which disappears in the relatively broad line width.…”

Section: Epr Spectroscopy Solid State Epr Spectroscopysupporting

confidence: 77%

“…It is known from previous studies that the cell cycle progression is regulated series of checkpoints that assess whether a cell can progress with division [46,47]. Th most essential checkpoints are the G1 checkpoint, which allows cells to transition fro G1 to S phase, where DNA synthesis occurs, and the G2 checkpoint, which allows c For compound (2), when cells were treated with 5 µM, the percentage of cells that were in the G0/G1 phase significantly increased to 54.90% (p < 0.05), while cells in the S and G2/M phase significantly decreased to 13.81% (p < 0.001) and 10.78% (p < 0.05), respectively.…”

Section: Effect Of Copper(ii) Complexes On Cell Cycle Distributionmentioning

confidence: 99%

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Antiproliferative Copper(II) Complexes Bearing Mixed Chelating Ligands: Structural Characterization, ROS Scavenging, In Silico Studies, and Anti-Melanoma Activity

et al. 2022

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Melanoma is a skin cancer characterized by rapid growth and spread for which current therapies produce both resistance and increased risk of infection. To develop new anti-melanoma biocompatible species, the series of complexes Cu(N-N)(bzac)(X)⋅nH2O (N-N: 1,10-phenanthroline/2,2′-bipyridine, Hbzac: 1-phenyl-1,3-butanedione, X: NO3/ClO4, and n = 0, 1) was studied. Single-crystal X-ray diffraction revealed a mononuclear structure for all complexes. The ability of the complexes to scavenge or trap reactive oxygen species such as O2⋅− and HO⋅ was proved by EPR spectroscopy experiments. All complexes inhibited B16 murine melanoma cells in a dose-dependent and nanomolar range, but the complexes with 1,10-phenanthroline were more active. Moreover, comparative activity on B16 and healthy BJ cells revealed a therapeutic index of 1.27–2.24. Bioinformatic methods were used to calculate the drug-likeness, pharmacokinetic, pharmacogenomic, and pharmacodynamic profiles of the compounds. The results showed that all compounds exhibit drug-likeness features, as well as promising absorption, distribution, metabolism, and excretion (ADME) properties, and no toxicity. The pharmacodynamics results showed that the neutral species appear to be good candidates for antitumor molecular targets (Tyrosyl-DNA phosphodiesterase 1, DNA-(apurinic or apyrimidinic site) lyase or Kruppel-like factor 5). Furthermore, the pharmacogenomic results showed a good affinity of the copper(II) complexes for the human cytochrome. These results recommend complexes bearing 1,10-phenanthroline as good candidates for developing drugs to melanoma alternative treatment.

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Section: Epr Spectroscopy Solid State Epr Spectroscopysupporting

confidence: 77%

Section: Effect Of Copper(ii) Complexes On Cell Cycle Distributionmentioning

confidence: 99%

Antiproliferative Copper(II) Complexes Bearing Mixed Chelating Ligands: Structural Characterization, ROS Scavenging, In Silico Studies, and Anti-Melanoma Activity

et al. 2022

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“…The anisotropy energy has been obtained from the appropriate expression for E a in cubic symmetry with the point group O h [71]. The crystal field splitting has been calculated from the conventional crystal field Hamiltonian , where B 4 0 and B 6 0 are reported crystal-field parameters [33,35,36], and O n m are the Steven operators tabulated in [72].…”

Section: Radio-frequency Transverse Susceptibility and Magnetic Phase...mentioning

confidence: 99%

Parimagnetism in HoCo₂and TmCo₂

Bonilla

Herrero‐Albillos

Figueroa

et al. 2014

J. Phys.: Condens. Matter

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X-ray magnetic circular dichroism (XMCD), longitudinal (χac) and transverse (TS) ac magnetic susceptibility have been measured in the RCo2 series (R = Ho, and Tm) as a function of temperature and applied magnetic field. We show that parimagnetism is a general behavior among the RCo2 ferrimagnetic series (R being a heavy rare-earth ion). XMCD results supply evidence of the presence of two compensation temperatures above Tc, defining two different parimagnetic configurations, which is a fully unexpected result. The inverse χ'ac curve exhibits a small anomaly which vanishes under low applied magnetic fields. The combination of TS and XMCD measurements allows one to depict new magnetic phase diagrams for these compounds of the RCo2 series. A new scenario allowing one to understand the observed phenomenology as a Griffiths phase-like behavior is proposed, where the amorphous RCo2 represents the undiluted system case.

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“…This interacts with molecular rotation to give a strong absorption band at wavelengths between 4 and 6 mm, with an extra line at 2.5 mm. [20][21][22] See also a recent review, 'Electron paramagnetic resonance in gases' 23 The emission of microwave radiation from the sun was also detected by Dicke and Beringer, 24 and emission from hydrogen atoms in interstellar space, at the hyperfine frequency of 1.42 GHz, was detected by Ewen and Purcell, 25 and by Müller and Oort. 26…”

Section: Radiolocation (Radar)mentioning

confidence: 92%

“…44 Work on atoms and molecules by electron paramagnetic resonance has been reviewed. 23,45 In the solid state, much more precise measurements of hyperfine structure were made possible by the invention of ENDOR (electron-nuclear double resonance) by George Feher at the Bell Telephone Laboratories. 46 A major international conference was held in Amsterdam in 1950, where the opening address was given by C.J.…”

Section: Radio-frequency Spectroscopy In Condensed Mattermentioning

confidence: 99%

Jubilees of radio-frequency spectroscopy

Bleaney¹

1997

Notes Rec. R. Soc. Lond.

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The years 1994–96 are marked by a series of golden jubilees: the first electron magnetic resonance experiment at Kazan (Zavoisky, 1945); nuclear magnetic resonance at Harvard (1945) and nuclear magnetic induction at Stanford (1945); ferromagnetic resonance in Oxford (1946); and microwave spectroscopy of gases (Oxford, and at several laboratories in the USA, 1944–45). These were commemorated by four plenary lectures at the 28th Colloque A.M.P.E.R.E. (Canterbury, 1–6 September 1996).

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Electron Paramagnetic Resonance in Gases

Cited by 4 publications

References 22 publications

Antiproliferative Copper(II) Complexes Bearing Mixed Chelating Ligands: Structural Characterization, ROS Scavenging, In Silico Studies, and Anti-Melanoma Activity

Antiproliferative Copper(II) Complexes Bearing Mixed Chelating Ligands: Structural Characterization, ROS Scavenging, In Silico Studies, and Anti-Melanoma Activity

Parimagnetism in HoCo₂and TmCo₂

Jubilees of radio-frequency spectroscopy

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Electron Paramagnetic Resonance in Gases

Cited by 4 publications

References 22 publications

Antiproliferative Copper(II) Complexes Bearing Mixed Chelating Ligands: Structural Characterization, ROS Scavenging, In Silico Studies, and Anti-Melanoma Activity

Antiproliferative Copper(II) Complexes Bearing Mixed Chelating Ligands: Structural Characterization, ROS Scavenging, In Silico Studies, and Anti-Melanoma Activity

Parimagnetism in HoCo2and TmCo2

Jubilees of radio-frequency spectroscopy

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Parimagnetism in HoCo₂and TmCo₂