FT-IR and FT-RAMAN investigations of nicotinaldehyde

Jose, Sujin P.; Mohan, S.

doi:10.1016/j.saa.2005.06.040

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…The peaks at 1697, 1213, 1079, and 1027 cm −1 are assigned to the C=O stretching vibrations of the aromatic rings in 4-pyridinecarboxaldehyde and the carboxyl group in citric acid [ 34 ]. The peak at 1339 cm −1 is attributed to the -CHO out-of-plane deformation and the C-N stretching vibration of 4-pyridinecarboxyaldehyde [ 34 , 43 ]. The vibrational band at 1615 cm −1 is attributed to the asymmetric stretching vibration of the carboxyl functional group (-COOH) in citric acid [ 20 , 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

N,Zn-Doped Fluorescent Sensor Based on Carbon Dots for the Subnanomolar Detection of Soluble Cr(VI) Ions

Adotey

Torkmahalleh

Hopke

et al. 2023

Sensors

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The development of a fluorescent sensor has attracted much attention for the detection of various toxic pollutants in the environment. In this work, fluorescent carbon dots (N,Zn-CDs) doped with nitrogen and zinc were synthesized using citric acid monohydrate and 4-pyridinecarboxyaldehyde as carbon and nitrogen sources, respectively. The synthesized N,Zn-CDs served as an “off” fluorescence detector for the rapid and sensitive detection of hexavalent chromium ions (Cr(VI)). The zinc metal integrated into the heteroatomic fluorescent carbon dot played a functional role by creating a coordination site for the hydrogen ions that were displaced after the addition of Cr to the solution matrix. The stepwise addition of Cr(VI) effectively quenched the fluorescence intensity of the N,Zn-CDs, and this phenomenon was attributed to the internal filter effect. A low detection limit of 0.47 nmol/L for Cr(VI) was achieved in the fluorescence experiments. Real water samples were used to evaluate the practical application of N,Zn-CDs for the quantification of Cr(VI). The results show acceptable recoveries and agreement with ion chromatography-ultraviolet spectrometry results. These good recoveries indicate that the fluorescence probe is very well suited for environmental measurements.

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Section: Resultsmentioning

confidence: 99%

N,Zn-Doped Fluorescent Sensor Based on Carbon Dots for the Subnanomolar Detection of Soluble Cr(VI) Ions

Adotey

Torkmahalleh

Hopke

et al. 2023

Sensors

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“… We then turn to compare the Raman enhancement between P-GERTs and GERRTs. It is surprising to note that SERS signals of 4-NBT are completely overwhelmed by the SERS signals of fluorescent reporters at 536, 622, and 687 cm –1 (corresponding to N–H nonplanar vibration, CCN in-plane bending, and Si–O–Si symmetric stretching vibration) for GERRTs-775 and ones at 525, 559, and 1206 cm –1 (corresponding to phenyl out-of-plane substituent-sensitive vibration, phenyl in-plane deformation, and C–H in-plane deformation) for GERRTs-780, respectively. This can be explained by the fact that the Ag shell dramatically weakens the excitation efficiency and scattered photons of embedded 4-NBT but promotes the extraordinary SERRS effect of fluorescent reporters. , This can be further demonstrated by the result that GERRTs-780 show an increase in the Raman intensity of more than 2 orders of magnitude compared to that without Ag coating (see Figure S4).…”

Section: Resultsmentioning

confidence: 99%

Ag-Coated Au Nanopetals: Dual-Type Single-Nanoparticle Detection of Gap-Enhanced Resonance Raman Tags

2020

ACS Appl. Nano Mater.

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Single-molecule (SM) detection in surface-enhanced Raman spectroscopy (SERS) demonstrates ultrahigh sensitivity and boosts wide applications. The bianalyte SERS (BiASERS) technique largely improves the accuracy and reliability of SM SERS detection over the monoanalyte approach by avoiding the use of ultralow-concentration samples and induced inaccuracy and very limited events. Herein, dual-type single-nanoparticle (SNP) SERS detection, an adapted version of the bianalyte SM technique, was developed for the first time with two types of ultrabright gap-enhanced resonance Raman tags (GERRTs) with embedded near-infrared resonant fluorescent molecules, showing concentration-and acquisition timedependent behaviors and the SNP sensitivity in both aqueous and dry states. Additionally, a correlative Raman imaging and scanning electron (RISE) microscopy confirms the SNP events of GERRTs on the substrate. Therefore, we expand the feasible application scenarios of the BiASERS technique from merely SM to SNP detection and more importantly demonstrate the effectiveness of the pure statistical model of BiASERS with the undoubted experimental examinations. Dual-type SNP detection of GERRTs may open new opportunities for development of ultrasensitive nanotags for reliable localized and quantitative detection in biological environments.

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“…The calculated scaled wavenumbers, experimental wavenumbers given by Jose and Mohan 6 and the assignments are given in Table 2. The pyridine CH stretching vibrations are usually observed in the range 9 3100-3000 cm -1 and in the present case the DFT calculations give υCH in the range 3056-3093 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

Computational study of 3-pyridine carboxaldehyde

Y¹,

Devi²,

Nair³

et al. 2010

Mat Sci Res India

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The vibrational wavenumbers of 3-pyridine carboxaldehyde were calculated using Gaussian03 software package at different levels and the fundamental modes are assigned. The predicted infrared and Raman activities are reported. The first hyperpolarizability is calculated and the title compound is an attractive object for future studies of non linear optics. The calculated wavenumbers are in agreement with the reported experimental values.

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FT-IR and FT-RAMAN investigations of nicotinaldehyde

Cited by 17 publications

References 5 publications

N,Zn-Doped Fluorescent Sensor Based on Carbon Dots for the Subnanomolar Detection of Soluble Cr(VI) Ions

N,Zn-Doped Fluorescent Sensor Based on Carbon Dots for the Subnanomolar Detection of Soluble Cr(VI) Ions

Ag-Coated Au Nanopetals: Dual-Type Single-Nanoparticle Detection of Gap-Enhanced Resonance Raman Tags

Computational study of 3-pyridine carboxaldehyde

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