Hydroxylation of benzophenone with ammonium phosphomolybdate in the solid state via UV photoactivation

Basu, Mrinmoyee; Sarkar, Suresh; Pande, Surojit; Jana, Subhra; Sinha, Arun K.; Sarkar, Sougata; Pradhan, Mukul; Pal, Anjali; Pal, Tarasankar

doi:10.1039/b905718h

Cited by 27 publications

(16 citation statements)

References 11 publications

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“…The nanocomposite developed for further usage in stereolithography application was prepared using benzophenone and TiO 2 nanoparticles, and consequently, the mixed material was irradiated with 360 nm UV radiation. The reason behind using UV radiation with this wavelength is the sensitivity of both benzophenone and nano-TiO 2 to radiations below 365 nm [20,21]. The UV spectra of the photoinitiator has absorption peaks at 258 nm [22,23], while the used photocatalyst filler (TiO 2 ) presents absorption peak at 336 nm, and a tail at 370 nm, as shown in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Are Nano TiO2 Inclusions Improving Biocompatibility of Photocurable Polydimethylsiloxane for Maxillofacial Prosthesis Manufacturing?

et al. 2021

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(1) Background: The development of a biocompatible material for direct additive manufacturing of maxillofacial extraoral prosthesis is still a challenging task. The aim of the present study was to obtain a photocurable PDMS, with nano TiO2 inclusions, for directly 3D printing of extraoral, maxillofacial prosthesis. The biocompatibility of the newly obtained nanocomposite was also investigated; (2) Methods: 2.5% (m/m) titania nanoparticles (TiO2) oxide anatase and a photoinitiator, benzophenone (BF) 4.5% were added to commercially available PDMS for maxillofacial soft prostheses manufacturing. The three different samples (PDMS, PDMS-BF and PDMS-BF-TiO2) were assessed by dielectric curing analysis (DEA) based on their viscosities and curing times. In vitro micronucleus test (MNvit) was performed for genotoxicity assessment and three concentrations of each compounds (2 mg/L, 4 mg/L and 8 mg/L) were tested in duplicate and compared to a control; (3) Results: The nanocomposite PDMS-BP-TiO2 was fully reticulated within a few minutes under UV radiation, according to the dielectric analysis. PDMS-BF-TiO2 nanocomposite showed the lowest degree of cyto- and genotoxicity; (4) Conclusions: In the limits of the present study, the proposed ex situ preparation of a PDMS-BP-TiO2 offers an easy, simple, and promising technique that could be successfully used for 3D printing medical applications.

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Section: Resultsmentioning

confidence: 99%

Are Nano TiO2 Inclusions Improving Biocompatibility of Photocurable Polydimethylsiloxane for Maxillofacial Prosthesis Manufacturing?

et al. 2021

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“…The reactivity towards water is of special concern, because as part of the MOF framework, all the benzophenone moieties are exposed, and even air humidity might lead to a reaction under light exposure. Actually, there are only very few studies in the literature for the reaction of benzophenone moieties in aqueous media . For the studies of the photochemical reactivity towards water, we used the Zr‐ bzpdc ‐MOF and, for comparison, the free linker molecule H 2 bzpdc to obtain fundamental insights into possible differences in photoreactivity.…”

Section: Resultsmentioning

confidence: 99%

“…This part focusses on the reactions with simple molecules, namely methanol and ethanol as well as water. Only few studies have reported on the reactions of benzophenone in aqueous media; in the present case, these may be especially important, as in the laboratory the MOF samples are exposed to light and air humidity when no special precautions are taken. In the second part of the study, we have reacted the Zr‐ bzpdc ‐MOF with series of alkanes and alcohols of different chain length.…”

Section: Introductionmentioning

confidence: 99%

Inside/Outside: Post‐Synthetic Modification of the Zr‐Benzophenonedicarboxylate Metal–Organic Framework

Mohmeyer

Schäfer

Schaate

et al. 2020

Chemistry A European J

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The Zr‐based metal–organic framework, Zr‐bzpdc‐MOF, contains the photoreactive linker molecule benzophenone‐4,4′‐dicarboxylate (bzpdc) which imparts the possibility for photochemical post‐synthetic modification. Upon irradiation with UV light, the keto group of the benzophenone moiety will react with nearly every C−H bond‐containing molecule. Within this paper, we further explore the photochemical reactivity of the Zr‐bzpdc‐MOF, especially with regard to which restrictions govern internal versus external reactions. We show that apart from reactions with C−H bond‐containing molecules, the MOF reacts also with water. By studying the reactivity versus linear alcohols we find a clear delineation in that shorter alcohol molecules (up to butanol as a borderline case) react with photoexcited keto groups throughout the whole crystals whereas longer ones react only with surface‐standing keto groups. In addition, we show that with the alkanes n‐butane to n‐octane, the reaction is restricted to the outer surface. We hypothesize that the reactivity of the Zr‐bzpdc‐MOF versus different reagents depends on the accessibility of the pore system which in turn depends mainly on the size of the reagents and on their polarity. The possibility to direct the post‐synthetic modification of the Zr‐bzpdc‐MOF (selective modification of the whole pore system versus surface modification) gives additional degrees of freedom in the design of this metal–organic framework for shaping and for applications.

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“…8 The backbone of the [PMo 12 O 40 ] 3À anion consists of a central tetrahedral [PO 4 ] À3 zone that provides strength to the molecule. [3][4][5][6][7][8][9] Recently APM has been proved to be an attractive catalyst, [10][11][12] a support material for drug delivery, 13 performs biological activities, 14 DNA synthesis and repair, 14,15 sustain photochemical reaction, [16][17][18] nanoparticle synthesis, 19 cathode active material, 20,21 and even electrochemical application. 22 Many of these applications originated from the redox activity of the [PMo 12 O 40 ] 3À anion with a robust electron reservoir capability.…”

Section: Introductionmentioning

confidence: 99%

Ammonium phosphomolybdate: a material for dielectric crossover and resistive switching performance

et al. 2020

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Hydroxylation of benzophenone with ammonium phosphomolybdate in the solid state via UV photoactivation

Abstract: UV photoactivation of a mixture of benzophenone and ammonium phosphomolybdate (APM) in the solid state splits adsorbed moisture, resulting in selectively hydroxylated benzophenone and leaving an electron trapped in green (reduced) solid APM.

Cited by 27 publications

References 11 publications

Are Nano TiO2 Inclusions Improving Biocompatibility of Photocurable Polydimethylsiloxane for Maxillofacial Prosthesis Manufacturing?

Are Nano TiO2 Inclusions Improving Biocompatibility of Photocurable Polydimethylsiloxane for Maxillofacial Prosthesis Manufacturing?

Inside/Outside: Post‐Synthetic Modification of the Zr‐Benzophenonedicarboxylate Metal–Organic Framework

Ammonium phosphomolybdate: a material for dielectric crossover and resistive switching performance

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