Experimental (FT-IR, FT-Raman and UV–Vis) spectra and theoretical DFT investigations of 2,3-diaminophenazine

Sylvestre, S.; Sebastian, S.; Oudayakumar, K.; Jayavarthanan, T.; Sundaraganesan, N.

doi:10.1016/j.saa.2012.05.047

Cited by 19 publications

(10 citation statements)

References 24 publications

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“…Before characterizations, the nal product that was separated from reaction solution by centrifugation was carried out through cooling crystallization, centrifugation and desiccation to form a needle-like crystal (Scheme 1C). 34 Based on above characterizations, we can identify that the obtained product is DAP. 3(a) shows the IR spectrum of the crystal.…”

Section: Identication Of the Opd-oxidized Productmentioning

confidence: 99%

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Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

Chen

et al. 2015

RSC Adv.

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A surface-enhanced Raman scattering (SERS) sensor of mercury ions based on the coordinated catalytic reaction of Hg 2+ -Ag nanoparticles (NPs) has been designed and constructed for water quality monitoring. We combined Ag NPs (average particle size is 49 nm) with mercury ions to form Hg 2+ -Ag NPs in aqueous phase by electrostatic interactions. The formed Hg 2+ -Ag particles can catalyze a redox reaction between o-phenylendiamine (OPD) and dissolved oxygen to form 2,3diaminephenazine (DAP), which is Raman-active and possesses a strong SERS signal due to the adherence to Ag NPs. Therefore we can trace the SERS intensity of DAP to determine mercury ions and the lowest detectable concentration of mercury is 1.0 nM using this method. This sensor displays higher sensitivity and selectivity and it possesses a certain value in terms of water quality detection.

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Section: Identication Of the Opd-oxidized Productmentioning

confidence: 99%

“…3(a), it proves that the product of the OPD-oxidized reaction is DAP, which is similar to the previously reported DAP molecules. 33,34 Fig. 3(b) displays the MS of the product.…”

Section: Identication Of the Opd-oxidized Productmentioning

confidence: 99%

Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

Chen

et al. 2015

RSC Adv.

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“…The embedded micro-photographic image in Figure 3 shows the dried spot of concentrated sample, spiked with six cells of Salmonella. The characteristic peaks of Safranin O marked at 615, 759, 1202, 1377, 1556, and 1641cm −1 noticeably appear in each trace of Figure 3 [ 30 , 31 ]. The assignments of these peaks to each corresponding vibration modes are listed in the Appendix B section.…”

Section: Resultsmentioning

confidence: 99%

Integration of a Thermoelectric Heating Unit with Ionic Wind-Induced Droplet Centrifugation Chip to Develop Miniaturized Concentration Device for Rapid Determination of Salmonella on Food Samples Using Antibody-Functionalized SERS Tags

Chen

Wang

et al. 2020

Sensors

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When a centrifugation-enriched sample of 100 μL containing the surface-enhanced Raman scattering (SERS) tag-bound bacteria (Salmonella in this study) is siphoned onto a glass slide next to an embedded thermoelectric heating chip, such a sessile droplet is quickly evaporated. As the size of the sample droplet is significantly reduced during the heating process, ionic wind streams from a corona discharge needle, stationed above the sample, sweep across the liquid surface to produce centrifugal vortex flow. Tag-bound Salmonella in the sample are then dragged and trapped at the center of droplet bottom. Finally, when the sample is dried, unlike the “coffee ring” effect, the SERS tag-bound Salmonella is concentrated in one small spot to allow sensitive detection of a Raman signal. Compared with our previous electrohydrodynamic concentration device containing only a corona discharge needle, this thermoelectric evaporation-assisted device is more time-effective, with the time of concentrating and drying about 100 μL sample reduced from 2 h to 30 min. Hence, sample throughput can be accelerated with this device for practical use. It is also more sensitive, with SERS detection of a few cells of Salmonella in neat samples achievable. We also evaluated the feasibility of using this device to detect Salmonella in food samples without performing the culturing procedures. Having spiked a few Salmonella cells into ice cubes and lettuce leaves, we use filtration and ultracentrifugation steps to obtain enriched tag-bound Salmonella samples of 200 μL. After loading an aliquot of 100 μL of sample onto this concentration device, the SERS tag signals from samples of 100 g ice cubes containing two Salmonella cells and 20 g lettuce leaf containing 5 Salmonella cells can be successfully detected.

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“…17 Through density functional theory (DFT) calculations Sylvestre et al have performed vibration analysis and natural bond orbital analysis of DAP. 18 Vibrational analysis indicates simultaneous existence of the C-C stretching mode for both its IR and Raman spectra thereby allowing delocalization of charge from electron donating amino groups to the phenazine ring. Additionally, the theoretically computed HOMO and LUMO energy gap closely matches with the observed  max peak at 419 nm in its UV-visible absorption spectrum (Figure 2A).…”

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confidence: 99%

“…Molecular electrostatic potential (MEP) analysis also revealed the highest degree of negative charge accumulation to be on the pyrazine nitrogen atoms ( Figure 2B). 18 Expectedly the 2,3-diamino group in 4 being a stronger electron donor than the 2,3-dialkoxy groups in 8 and 10 (Scheme 1) as reflected in the para-Hammett constants ( p values for -NH 2 is -0.66 and for -OEt is -0.25), 19 the extent of ICT in 4 is higher than that in 8 and 10 which is why the corresponding  max is modestly red-shifted (419 nm over 410 nm). A pH sensitive imidazole-fused phenazine 11 was reported by Ryazanova et.…”

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confidence: 99%

Phenazines as chemosensors of solution analytes and as sensitizers in organic photovoltaics

Banerjee¹

2016

Arkivoc

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Experimental (FT-IR, FT-Raman and UV–Vis) spectra and theoretical DFT investigations of 2,3-diaminophenazine

Cited by 19 publications

References 24 publications

Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

Integration of a Thermoelectric Heating Unit with Ionic Wind-Induced Droplet Centrifugation Chip to Develop Miniaturized Concentration Device for Rapid Determination of Salmonella on Food Samples Using Antibody-Functionalized SERS Tags

Phenazines as chemosensors of solution analytes and as sensitizers in organic photovoltaics

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