Factors for the emission enhancement of dimidium in specific media such as in DNA and on a clay surface

Nakazato, Ryosuke; Sano, Keito; Ichihara, Hiroyuki; Ishida, Tamao; Shimada, Takahiro; Takagi, Shinsuke

doi:10.1039/c9cp03285a

Cited by 13 publications

(8 citation statements)

References 41 publications

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“…Such spectral shifts on the clay surface have been reported in many papers. 28 − 30 , 36 , 46 , 47 It was proposed that the cause of the red shift is that the π-conjugated system is expanded by a flattening of molecules on the clay surface, which is flat at the atomic level. 44 − 47 Since PhAcr + , which has a rotational substituent, showed a larger wavelength shift than Acr + , which does not have a rotational substituent, it is presumed that a similar phenomenon occurred in the case of Acr.…”

Section: Resultsmentioning

confidence: 99%

“… 28 − 30 , 36 , 46 , 47 It was proposed that the cause of the red shift is that the π-conjugated system is expanded by a flattening of molecules on the clay surface, which is flat at the atomic level. 44 − 47 Since PhAcr + , which has a rotational substituent, showed a larger wavelength shift than Acr + , which does not have a rotational substituent, it is presumed that a similar phenomenon occurred in the case of Acr. Furthermore, as the negative charge distance of the clay increased, the red shift of the absorption maxima of PhAcr + increased.…”

Section: Resultsmentioning

confidence: 99%

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Effects of the Surface Charge Density of Clay Minerals on Surface-Fixation Induced Emission of Acridinium Derivatives

et al. 2021

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Surface-fixation induced emission is a fluorescence enhancement phenomenon, which is expressed when dye molecules satisfy a specific adsorption condition on the anionic clay surface. The photophysical behaviors of two types of cationic acridinium derivatives [10-methylacridinium perchlorate (Acr + ) and 10-methyl-9-phenylacridinium perchlorate (PhAcr + )] on the synthetic saponites with different anionic charge densities were investigated. Under the suitable conditions, the fluorescence quantum yield (Φ f ) of PhAcr + was enhanced 22.3 times by the complex formation with saponite compared to that in water without saponite. As the inter-negative charge distance of saponite increased from 1.04 to 1.54 nm, the Φ f of PhAcr + increased 1.25 times. In addition, the increase in the negative charge distance caused the increase in the integral value of the extinction coefficient and the radiative deactivation rate constant ( k f ) and the decrease in the nonradiative deactivation rate constant. It should be noted that the 2.3 times increase in k f is the highest among the reported values for the effect of clay. From these results, it was concluded that the photophysical properties of dyes can be modulated by changing the charge density of clay minerals.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effects of the Surface Charge Density of Clay Minerals on Surface-Fixation Induced Emission of Acridinium Derivatives

et al. 2021

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“…The emission λ max showed a blue shift, and the Stokes shift became smaller than that in some organic solvents. A smaller Stokes shift has also been observed for various molecules on the clay nanosheet, 25,26,32,33 which is considered to be caused by the immobilization of molecules. S1.…”

Section: ■ Introductionmentioning

confidence: 97%

“…The surface-fixation-induced emission (S-FIE) phenomenon is an interesting study using clay nanosheets. − S-FIE is an emission enhancement phenomenon caused by adsorption on the clay nanosheet surface compared to a solution, and it is similar to aggregation-induced emission (AIE), which has attracted the attention of many researchers. − AIE studies have been conducted using molecules with basic structures such as tetraphenylethylene, and S-FIE molecules also share common characteristics. ,− The cationic and intramolecular rotation parts are important for the appearance of S-FIE. The mechanism of emission enhancement on the clay surface is common to many reported molecules and involves the inhibition of a nonradiative deactivation process, ,− ,, and this inhabitation is caused by suppressing the intramolecular motion during deactivation from the photoexcited state to the ground state by adsorption on the flat clay surface. However, the influence of adsorption on radiative deactivation was less significant. ,,, …”

Section: Introductionmentioning

confidence: 99%

Emission Enhancement of Anthracene Derivative Caused by a Dramatic Molecular Orbital Change on the Nanosheet Surface

Arakawa,

Shimada,

Ishida

et al. 2024

J. Phys. Chem. C

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The emission enhancement phenomenon on clay nanosheets is called surface-fixation-induced emission (S-FIE) and is similar to aggregation-induced emission, which has attracted the attention of many researchers. Both emission enhancement phenomena are primarily caused by the suppression of nonradiative deactivation. In this study, a new S-FIE molecule was synthesized and its basic photochemical behavior was investigated. The emission enhancement of the new molecule on the clay surface was induced by the suppression of nonradiative deactivation and acceleration of radiative deactivation. Density functional theory calculations indicated that the acceleration of radiative deactivation originated from the improvement in the spatial overlap between the two molecular orbitals related to the emission phenomenon and the increase in the Frank−Condon factor.

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“…Therefore, the simultaneous achievement of a strong emission intensity and high g lum seems challenging. On the other hand, the emission enhancement of luminophores due to their association with DNA was widely reported 36 – 39 . In our previous study, emission enhancement and induced CPL were achieved by associating an achiral Eu(III) complex with DNA-CTMA 40 .…”

Section: Introductionmentioning

confidence: 99%

Chiroptical property enhancement of chiral Eu(III) complex upon association with DNA-CTMA

Minami

Itamoto

Watanabe

et al. 2020

Sci Rep

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DNA-based materials have attracted much attention due to their unique photo-functional properties and potential applications in various fields such as luminescent and biological systems, nanodevices, etc. In this study, the photophysical properties of a chiral Eu(III) complex, namely (Eu(D-facam)3), within DNA films were extensively investigated. The enhancement of photoluminescence (more than 25-folds increase of luminescence quantum yield) and degree of circularly polarization in luminescence (glum = − 0.6) was observed upon interaction with DNA. Various photophysical analyses suggested that the emission enhancement was mainly due to an increase of the sensitization efficiency (high ηsens) from the ligands to Eu(III) and suppression of the vibrational deactivation upon immobilization onto the DNA molecule. From CD and VCD measurements, it was suggested that the coordination structure of Eu(D-facam)3 was affected by the interaction with DNA, suggesting that the structural change of Eu(D-facam)3 contributed to the improvement of its luminescent properties.

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Factors for the emission enhancement of dimidium in specific media such as in DNA and on a clay surface

Abstract: Fluorescence enhancement in DNA and on nanosheets.

Cited by 13 publications

References 41 publications

Effects of the Surface Charge Density of Clay Minerals on Surface-Fixation Induced Emission of Acridinium Derivatives

Effects of the Surface Charge Density of Clay Minerals on Surface-Fixation Induced Emission of Acridinium Derivatives

Emission Enhancement of Anthracene Derivative Caused by a Dramatic Molecular Orbital Change on the Nanosheet Surface

Chiroptical property enhancement of chiral Eu(III) complex upon association with DNA-CTMA

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