Magnetic properties of 3-(4-R-phenyl)-1,5-diphenyl-6-oxo- and -thioxoverdazyl radical crystals (R = OCH3, CH3, CN, and NO2)

Article Abstract:

The body of research on organic radical crystals is extended with an investigation of the magnetic characteristics of eight kinds of 3-(4-R-substituded-phenyl)-1,5-diphenyl-6-oxo and -thioxoverdazyl radicals (R = OCH(sub 3), CH(sub 3), CN and NO(sub 2)). The ferromagnetic intermolecular exchange interactions had high probability for the verdazyl radical crystals, which allowed ab initio molecular orbital calculations. Findings revealed a very strong spin polarization effect, which facilitates the intermolecular ferromagnetic interaction.

Crystals, Ferromagnetism, Radicals (Chemistry), Intermolecular forces, Magnetic properties

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Time-resolved electron paramagnetic resonance investigation of photoinitiated antioxidant reaction of Vitamin C (ascorbic Acid) with xanthone in aqueous sodium lauryl sulfate, hexadecyltrimethylammonium chloride, and triton X-100 micelle solutions

Article Abstract:

The photoinitiated antioxidant reaction of Vitamin C with (super 3)Xn in the sodium lauryl sulfate (SDS), hexadecyltrimethylammonium chloride (CTAC), and TX-100 micelle solutions at various pH, by using a time resolved electron paramagnetic resonance (TR-EPR) technique is studied. TR-EPR being a powerful tool in investigating photoinduced reactions can detect and identify short-lived intermediate radicals directly and can also chemically induces dynamic electron polarization (CIDEP) phenomena.

Science & research, Analysis, Antioxidants, Antioxidants (Nutrients), Vitamin C, Electron paramagnetic resonance, Properties

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Doping effects of magnetic impurities on the spin-Peirls (p-CyDOV) and dimer (p-BrDOV) systems

Article Abstract:

It has been possible to measure the magnetic susceptibility of 11 types of mixed radical crystals to assess the impact of magnetic impurities on the SP transition of p-CyDOV and on the dimer state of p-BrDOV. This is the first example of the impact of magnetic impurities on the SP transition of organic compound.

Magnetic susceptibility

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