The design of a novel fluorescent PET sensor for proton and water: A phenylaminonaphtho[1,2-d]oxazol-2-yl-type fluorophore containing proton donor and acceptor groups

Ooyama, Yousuke; Egawa, Haruka; Yoshida, Katsuhira

doi:10.1016/j.dyepig.2008.11.002

Cited by 33 publications

(8 citation statements)

References 47 publications

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“…It was seen that the emission bands were shifted bathochromically with increasing excitation wavelength, which showed the distribution of surface energy traps on the CDs. 33,47 It showed an emission maximum at ∼450 nm when excited at 350 nm; therefore, all further experiments were also carried out at 350 nm excitation.…”

Section: Results and Discussionmentioning

confidence: 99%

“…However, the main drawbacks with MOF substrates are the complicated synthesis and possibility of leaking of the photoactive guests into the solution. Traditionally, the Karl Fischer method is used for measuring trace amount of water content in a sample, but compared to the sophisticated traditional method, fluorescence-based optical sensors , have become more popular due to their selectivity, sensitivity, easy fabrication, and simple analysis of the result. However, many of the probes were used to determine the water content by quenching the original fluorescence signal. − Hence, it is important to develop and study simple, less expensive, and advantageous fluorescent “turn-on” sensors for water detection.…”

Section: Introductionmentioning

confidence: 99%

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Functionalized Chitosan–Carbon Dots: A Fluorescent Probe for Detecting Trace Amount of Water in Organic Solvents

et al. 2019

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A novel nanoprobe was designed and synthesized by functionalizing chitosan–carbon dots (CDs) with a modified bipyridine-based heterocyclic molecule, 4-(pyridine-2-yl)-3 H -pyrrolo[2,3- c ]quinoline (PPQ), to detect trace amount of water via fluorescence methods. The functionalized CDs (PPQ-CDs) were thoroughly characterized using dynamic light scattering, UV–vis, X-ray diffraction, Fourier transform infrared, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and NMR techniques. The modified fluorescence intensity of PPQ-CDs was found to be an excellent indicator for water in organic solvents. The PPQ-CDs showed very weak fluorescence intensity in organic solvents due to a possible photoinduced electron transfer (PET) process between PPQ pyrrole nitrogen and acceptor groups of CDs. However, sequential addition of trace amount of water led to continuous enhancement in the fluorescence intensity for the PPQ-CD nanocomposites. The mechanism was proposed to follow suppression of the PET process due to the formation of “free-ions” by the proton transfer from the CD carboxyl group to pyrrole nitrogen through water bridging. The limit of water detection was determined to be 0.023% (v/v) in DMSO.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functionalized Chitosan–Carbon Dots: A Fluorescent Probe for Detecting Trace Amount of Water in Organic Solvents

et al. 2019

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“…It is widely known that some biologically important anions, such as fluoride (F − ), acetate (AcO − ), and dihydrogen phosphate (H 2 PO 4 − ), have attracted great attention in the recent decades, because of their importance on human health, environmental protection,1, 2 and other fields 3, 4. Accordingly, quite a few chemosensors, monomeric and polymeric, have been successfully created, developed, and studied these years 5–7. Most of the interactions between analytes and sensors are achieved by noncovalent binding 8.…”

Section: Introductionmentioning

confidence: 99%

A randomized controlled trial of an appearance‐focused intervention to prevent skin cancer

Hillhouse

Turrisi

Stapleton

et al. 2008

Cancer

166

156

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BACKGROUND Skin cancer represents a significant health threat with over 1.3 million diagnoses, 8000 melanoma deaths, and more than $1 billion spent annually for skin cancer healthcare in the US. Despite findings from laboratory, case-control, and prospective studies that indicate a link between youthful indoor tanning (IT) and skin cancer, IT is increasing among US youth. Appearance-focused interventions represent a promising method to counteract these trends. METHODS A total of 430 female indoor tanners were randomized into intervention or no intervention control conditions. Intervention participants received an appearance-focused booklet based on decision-theoretical models of health behavior. Outcome variables included self-reports of IT behavior and intentions, as well as measures of cognitive mediating variables. RESULTS Normative increases in springtime IT rates were significantly lower (ie, over 35%) at 6-month follow-up in intervention versus control participants with similar reductions in future intentions. Mediation analyses revealed 6 cognitive variables (IT attitudes, fashion attitudes, perceived susceptibility to skin cancer and skin damage, subjective norms, and image norms) that significantly mediated change in IT behavior. CONCLUSIONS The appearance-focused intervention demonstrated strong effects on IT behavior and intentions in young indoor tanners. Appearance-focused approaches to skin cancer prevention need to present alternative behaviors as well as alter IT attitudes. Mediational results provide guides for strengthening future appearance-focused interventions directed at behaviors that increase risk of skin cancer.

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“…Many fluorescent-based moisture sensors are available in the literature based on different kinds of mechanisms such as fluorescence intensity change, − ratio fluorescence, − solvatochromism, and so on. − Besides organic probes, some luminescent nanomaterials-based sensors for water detection have also been developed . For example, covalent organic frameworks (COFs), carbon quantum dots, metal–organic frameworks (MOFs), copper nanoclusters, and other nanomaterials have been reported for sensing water in organic solvents.…”

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confidence: 99%

Excited State Intramolecular Proton Transfer Plus Aggregation-Induced Emission-Based Diketopyrrolopyrrole Luminogen: Photophysical Properties and Simultaneously Discriminative Detection of Trace Water in Three Organic Solvents

Wang

Tang

et al. 2019

Anal. Chem.

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Developing solid state near-IR (NIR) emitters and simultaneously discriminative detection of trace water in organic solvents has long been a significant challenge. In this work, a novel diketopyrrolopyrrole-based luminogen (DPP1) with excited state intramolecular proton transfer (ESIPT) and aggregation-induced emission (AIE) characteristics has been designed and synthesized. Its amorphous and crystal solids show red and NIR-emissive fluorescence at 625 and 675 nm, respectively. When DPP1 reacts with fluoride anion, the resulting system (DPP1·F) can discriminatively detect the water content in aprotic solvents with colorimetric and fluorescent dual modes. Distinct fluorescent responses of “turn-on”, “ratiometric turn-off”, and “ratiometric turn-on” and low limits of detection of 0.0064, 0.042, and 0. The water-induced sensitive and fast change in THF was applied to the determination of water in foodstuffs in practical solid state indicator paper strips.

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The design of a novel fluorescent PET sensor for proton and water: A phenylaminonaphtho[1,2-d]oxazol-2-yl-type fluorophore containing proton donor and acceptor groups

Abstract: Abstract

Cited by 33 publications

References 47 publications

Functionalized Chitosan–Carbon Dots: A Fluorescent Probe for Detecting Trace Amount of Water in Organic Solvents

Functionalized Chitosan–Carbon Dots: A Fluorescent Probe for Detecting Trace Amount of Water in Organic Solvents

A randomized controlled trial of an appearance‐focused intervention to prevent skin cancer

Excited State Intramolecular Proton Transfer Plus Aggregation-Induced Emission-Based Diketopyrrolopyrrole Luminogen: Photophysical Properties and Simultaneously Discriminative Detection of Trace Water in Three Organic Solvents

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