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Radical Activity of Binary Melamine-Based Hydrogen-Bonded Self-Assemblies

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Abstract

Melamine cyanurate and melamine barbiturate self-assembled materials were prepared and studied by the electron paramagnetic resonance (EPR) spectroscopy, optical and scanning electron microscopy, X-ray powder diffraction (XRD). Both optical and electron microscopy show the formation of microscale crystalline particles possessing complex layered structures with a highly stable appearance. Both assemblies tend to form twinned crystals, which in the barbiturate case leads to multiple twinning in every particle. Optical microscopy shows high anisotropy and birefringence of both materials. XRD data represent a high crystallinity of melamine barbiturate and much lower for melamine cyanurate. Studied materials reveal the ability to incorporate radicals that correlate with their crystal structure quality. It is attributed to the structure-dependent stabilization of active radical superoxide species in structure voids or defects. In the example of melamine barbiturate, it is shown that the number of active paramagnetic centers increases at ca. 22% when a substance is irradiated with UV + Vis light. It reaches saturation in approximately 20 min, whereas only ca. 14% decrease was observed in a week.

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Acknowledgements

This work is supported by the Ministry of Science and Higher Education of the Russian Federation, goszadanie no. 2019-1075. ITMO Fellowship and Professorship program 08-08 is acknowledged for infrastructural support.

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Authors and Affiliations

  1. Infochemistry Scientific Center, ITMO University, Lomonosova str. 9, Saint Petersburg, 191002, Russia

    Vladimir V. Shilovskikh, Alexandra A. Timralieva & Ekaterina V. Skorb

  2. South Urals Federal Research Center of Mineralogy and Geoecology, Urals Branch of Russian Academy of Science, Miass, 456317, Russia

    Elena V. Belogub

  3. Department of Physics, M. V. Lomonosov Moscow State University, Moscow, Russia

    Elizaveta A. Konstantinova

  4. N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russia

    Alexander I. Kokorin

  5. Plekhanov Russian University of Economics, Moscow, Russia

    Alexander I. Kokorin

Authors
  1. Vladimir V. Shilovskikh
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  2. Alexandra A. Timralieva
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  3. Elena V. Belogub
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  4. Elizaveta A. Konstantinova
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  5. Alexander I. Kokorin
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  6. Ekaterina V. Skorb
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Correspondence to Vladimir V. Shilovskikh.

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Shilovskikh, V.V., Timralieva, A.A., Belogub, E.V. et al. Radical Activity of Binary Melamine-Based Hydrogen-Bonded Self-Assemblies. Appl Magn Reson 51, 939–949 (2020). https://doi.org/10.1007/s00723-020-01254-6

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  • DOI: https://doi.org/10.1007/s00723-020-01254-6

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