Raman and Surface Enhanced Raman Signals of the Sensor 1-(4-Mercaptophenyl)-2,4,6-Triphenylpyridinium Perchlorate

Célis, Freddy; Campos‐Vallette, Marcelo; Vega, José Cárcamo; Gómez-Jeria, Juan S.; Aliaga, Carolina

doi:10.4067/s0717-97072015000200018

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…The delocalized nature of this mode meant that the mode shifted in across the series of compounds. These ring breathing vibrational modes were also consistent with the 4-MPTP dye investigated by Celis et al, 39 which contained the TPP moiety.…”

Section: ■ Introductionsupporting

confidence: 87%

Investigation of the Geometric and Spectroscopic Properties of Four Twisted Triphenylpyridinium Donor–Acceptor Dyes

et al. 2022

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The geometric and spectroscopic properties of four cationic N-aryl-2,4,6-triphenylpyridinium-based donor–acceptor dyes1-[4-(9H-carbazol-9-yl)phenyl]-2,4,6-triphenylpyridinium, 1-[4-(N,N-diphenylamino)phenyl]-2,4,6-triphenylpyridinium, 1-(9-phenyl-9H-carbazol-3-yl)-2,4,6-triphenylpyridinium, and 1-(9-ethyl-9H-carbazol-3-yl)-2,4,6-triphenylpyridiniumare reported. The four dyes exhibited a twisted, quasi-perpendicular geometry about the central donor–acceptor bond, shown by X-ray crystallography and supported by Raman spectroscopy and DFT calculations. The electronic absorption spectra show weak charge transfer (CT) transitions at about 400 nm (ε ∼ 3000 L mol–1 cm–1). Time dependent (TD) DFT supported the nature of the CT transition, displaying an 89–97% shift in electron density from the donor to the acceptor upon electronic excitation. Excited state geometry calculations revealed significant geometry changes upon electronic excitation. Enhancement of vibrational modes attributable to this transition was also recognized in the resonance Raman spectra. Emission spectroscopies showed two distinct emission bands. The lower energy band, resulting from radiative decay of the CT excited state, exhibited large anomalous Stokes shifts of ∼9000 cm–1. Much of the Stokes shift was a consequence of geometry changes between the ground and excited states. This was confirmed by variable temperature emission studies, with Stokes shifts reducing by up to 3000 cm–1 upon cooling from 293 to 80 K. Additionally, a high energy aggregation induced emission band was present for two of the dyes, resulting from the inhibition of excited state geometry reorganization and supported by solid-state emission spectra. These phenomena exemplify the importance of geometry in short range donor–acceptor dyes such as these.

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Section: ■ Introductionsupporting

confidence: 87%

Investigation of the Geometric and Spectroscopic Properties of Four Twisted Triphenylpyridinium Donor–Acceptor Dyes

et al. 2022

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“…The Raman spectrum of the peptide D1 exhibited signals with medium-strong relative intensity at 1440, 1274, 1212, 854, 837, 725, 643, 598, and 407 cm −1 (Figure 5, black line). The proposed bands assignment, summarized in Table 1, is based on pertinent published data [22][23][24][25][26][27][28]. The strong band at 1440 cm −1 is assigned to vibrations related to the guanidinium group of arginine (D-Arg).…”

Section: Raman Spectroscopy Of Gnr-peg-d1mentioning

confidence: 99%

Gold Nanoparticles Mediate Improved Detection of β-amyloid Aggregates by Fluorescence

et al. 2020

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The early detection of the amyloid beta peptide aggregates involved in Alzheimer’s disease is crucial to test new potential treatments. In this research, we improved the detection of amyloid beta peptide aggregates in vitro and ex vivo by fluorescence combining the use of CRANAD-2 and gold nanorods (GNRs) by the surface enhancement fluorescence effect. We synthetized GNRs and modified their surface with HS-PEG-OMe and HS-PEG-COOH and functionalized them with the D1 peptide, which has the capability to selectively bind to amyloid beta peptide. For an in vitro detection of amyloid beta peptide, we co-incubated amyloid beta peptide aggregates with the probe CRANAD-2 and GNR-PEG-D1 observing an increase in the intensity of the fluorescence signal attributed to surface enhancement fluorescence. Furthermore, the surface enhancement fluorescence effect was observed in brain slices of transgenic mice with Alzheimer´s disease co-incubated with CRANAD-2 and GNR-PEG-D1. An increase in the fluorescence signal was observed allowing the detection of aggregates that cannot be detected with the single use of CRANAD-2. Gold nanoparticles allowed an improvement in the detection of the amyloid aggregated by fluorescence in vitro and ex vivo.

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Synthesis and functionalization of silver nanoparticles for divalent metal ion detection using surface-enhanced Raman spectroscopy

Daublytė,

Zdaniauskienė,

Talaikis

et al. 2023

J Nanopart Res

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Raman and Surface Enhanced Raman Signals of the Sensor 1-(4-Mercaptophenyl)-2,4,6-Triphenylpyridinium Perchlorate

Cited by 5 publications

References 29 publications

Investigation of the Geometric and Spectroscopic Properties of Four Twisted Triphenylpyridinium Donor–Acceptor Dyes

Investigation of the Geometric and Spectroscopic Properties of Four Twisted Triphenylpyridinium Donor–Acceptor Dyes

Gold Nanoparticles Mediate Improved Detection of β-amyloid Aggregates by Fluorescence

Synthesis and functionalization of silver nanoparticles for divalent metal ion detection using surface-enhanced Raman spectroscopy

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