Synthesis and characterization of the photoswitchable poly(methyl methacrylate- random-methacrylate spirooxazine)

Nguyen, Thanh-Sang; Tran, Phuc Huynh; Thai, Linh Duy; Truong, Thanh-Dat; Nguyen, Le‐Thu T.; Nguyên, Hà Trần

doi:10.1590/0104-1428.01118

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…This significant feature of spirooxazine requires greater consideration in the future studies on photochromic anticounterfeiting inks, which could result in full invisibility of the printed security marks before authentication by UV light. Nguyen and co-workers reported application of the light-responsive polymer coatings based on methyl methacrylate and spirooxazine copolymer in photopatterning . Negative photochromism is known as a significant weak point for the photochromic materials, which is lower in spirooxazine in comparison to that with spiropyran.…”

Section: Photochromismmentioning

confidence: 99%

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Photoluminescent and Chromic Nanomaterials for Anticounterfeiting Technologies: Recent Advances and Future Challenges

et al. 2020

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Counterfeiting and inverse engineering of security and confidential documents, such as banknotes, passports, national cards, certificates, and valuable products, has significantly been increased, which is a major challenge for governments, companies, and customers. From recent global reports published in 2017, the counterfeiting market was evaluated to be $107.26 billion in 2016 and forecasted to reach $206.57 billion by 2021 at a compound annual growth rate of 14.0%. Development of anticounterfeiting and authentication technologies with multilevel securities is a powerful solution to overcome this challenge. Stimuli-chromic (photochromic, hydrochromic, and thermochromic) and photoluminescent (fluorescent and phosphorescent) compounds are the most significant and applicable materials for development of complex anticounterfeiting inks with a high-security level and fast authentication. Highly efficient anticounterfeiting and authentication technologies have been developed to reach high security and efficiency. Applicable materials for anticounterfeiting applications are generally based on photochromic and photoluminescent compounds, for which hydrochromic and thermochromic materials have extensively been used in recent decades. A wide range of materials, such as organic and inorganic metal complexes, polymer nanoparticles, quantum dots, polymer dots, carbon dots, upconverting nanoparticles, and supramolecular structures, could display all of these phenomena depending on their physical and chemical characteristics. The polymeric anticounterfeiting inks have recently received significant attention because of their high stability for printing on confidential documents. In addition, the printing technologies including hand-writing, stamping, inkjet printing, screen printing, and anticounterfeiting labels are discussed for introduction of the most efficient methods for application of different anticounterfeiting inks. This review would help scientists to design and develop the most applicable encryption, authentication, and anticounterfeiting technologies with high security, fast detection, and potential applications in security marking and information encryption on various substrates.

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Section: Photochromismmentioning

confidence: 99%

“…Nguyen and co-workers reported application of the light-responsive polymer coatings based on methyl methacrylate and spirooxazine copolymer in photopatterning. 93 Negative photochromism is known as a significant weak point for the photochromic materials, which is lower in spirooxazine in comparison to that with spiropyran.…”

Section: Photochromismmentioning

confidence: 99%

Photoluminescent and Chromic Nanomaterials for Anticounterfeiting Technologies: Recent Advances and Future Challenges

et al. 2020

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Optical properties of solute molecules: Environmental effects, challenges, and their practical implications

Homocianu¹

2021

Microchemical Journal

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Crystal structures of cocrystals of 2,7-dihydroxynaphthalene with isoniazid and piracetam

González-González¹,

Flores²,

Flores-Álamo³

et al. 2022

Acta Crystallogr C

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Cocrystals of 2,7-dihydroxynaphthalene (DHN, or naphthalene-2,7-diol) with isoniazid (pyridine-4-carbohydrazide) (INH), denoted DHN–INH [C10H8O2·C6H7N3O, (I)], and piracetam [2-(2-oxopyrrolidin-1-yl)acetamide] (PIR), denoted DHN–PIR [C10H8O2·C6H10N2O2, (II)], were obtained by the solvent-assisted grinding method and characterized by IR spectroscopy, powder X-ray diffraction and single-crystal X-ray diffraction. Cocrystal (I) crystallized in the triclinic space group P\overline{1} and showed a 2:2 stoichiometry. DHN and INH molecules are connected by O—H...N(pyridine) and O—H...N(hydrazide) hydrogen bonds. Cocrystal (II) crystallized in the space group Pca21 with a 1:1 stoichiometry. DHN and PIR molecules are connected by O—H...O=C hydrogen bonds. The supramolecular architecture of cocrystal (I) showed interlinked supramolecular tapes; meanwhile, in cocrystal (II), interlinked supramolecular sheets were observed.

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Synthesis and characterization of the photoswitchable poly(methyl methacrylate- random-methacrylate spirooxazine)

Cited by 3 publications

References 15 publications

Photoluminescent and Chromic Nanomaterials for Anticounterfeiting Technologies: Recent Advances and Future Challenges

Photoluminescent and Chromic Nanomaterials for Anticounterfeiting Technologies: Recent Advances and Future Challenges

Optical properties of solute molecules: Environmental effects, challenges, and their practical implications

Crystal structures of cocrystals of 2,7-dihydroxynaphthalene with isoniazid and piracetam

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