Spectral study of interaction between Silica nanoparticles and molecules of photochromic spirocompounds in solutions

Document Type : Reasearch Paper

Authors

• Valery Аlexandrovich Barachevsky ^{1, 2}
• Olga Vladimirovna Venidiktova ¹
• Tatyana МIkhailovna Valova ²
• Artur Аlbertovich Khuzin ³
• Airat Ramilevich Tuktarov ³
• Andrey Ivanovich Shienok ⁴
• Natalia Leonidovna Zaichenko ⁴

¹ Photochemistry Center FSRC "Crystallography and Photonics" of the Russian Academy of Sciences, Moscow, Russia.

² Interdepartmental Center of Analytical Research of the Russian Academy of Sciences, Moscow, Russia.

³ Institute of Petrochemistry and Catalysis, Ufa FRC of the Russian, Academy of Sciences, Ufa, Russia.

⁴ N. N. Semenov FRC of Chemical Physics of the Russian Academy of Sciences, Москва, Russiа.

10.22034/ijnd.2022.684224

Abstract

A comparative spectral study of water–acetonitrile systems containing photochromic spiropyran and spirooxazine derivatives in the absence and in the presence of silica nanoparticles was carried out. The photoinduced formation of proton complexes beetwen phenolic oxygen of the colored forms of spirocompounds and the surface hydroxyl groups of silica nanoparticles was established for all of the derivatives. The photoinduced proton complexes of the spiropyrans exhibit positive photochromism on the surface of silica nanoparticles. It is assumed that the previously discovered negative photochromism is due to the formation of proton complexes with not only phenolic oxygen, but also the OH group at the nitrogen atom of the indoline spiropyran moiety. These complexes can also exist in the absence of nanoparticles, because of interaction with water molecules.
A comparative spectral study of water–acetonitrile systems containing photochromic spiropyran and spirooxazine derivatives in the absence and in the presence of silica nanoparticles was carried out. The photoinduced formation of proton complexes beetwen phenolic oxygen of the colored forms of spirocompounds and the surface hydroxyl groups of silica nanoparticles was established for all of the derivatives. The photoinduced proton complexes of the spiropyrans exhibit positive photochromism on the surface of silica nanoparticles. It is assumed that the previously discovered negative photochromism is due to the formation of proton complexes with not only phenolic oxygen, but also the OH group at the nitrogen atom of the indoline spiropyran moiety. These complexes can also exist in the absence of nanoparticles, because of interaction with water molecules.

Keywords

• Photochromism
• Proton Complexes
• Silica Nanoparticles
• Spectroscopy
• Spirocompounds

20.1001.1.20088868.2022.13.1.2.4

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