Gas-phase acid-base properties of melamine and cyanuric acid

Mukherjee, Sumit; Ren, Jianhua

doi:10.1016/j.jasms.2010.06.002

Cited by 24 publications

(26 citation statements)

References 53 publications

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“…Although not depicted, a hydrogen migration from the oxygen to the nitrogen in the Meisenheimer complex similar to those seen by Mukherjee and Ren [61], produces a stable keto-like ring opened structure (−40.2 kcal mol -1 ). The barrier to this process lays 7.3 kcal mol -1 below the total energy of reactants and may be the pathway that leads to the observed fragmentation products.…”

Section: Potential Energy Surface Of 135-triazine Reactionsmentioning

confidence: 54%

Gas Phase Reactions of 1,3,5-Triazine: Proton Transfer, Hydride Transfer, and Anionic σ-Adduct Formation

Garver

Yang

Kato

et al. 2011

J. Am. Soc. Mass Spectrom.

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The gas phase reactivity of 1,3,5-triazine with several oxyanions and carbanions, as well as amide, was evaluated using a flowing afterglow-selected ion flow tube mass spectrometer. Isotopic labeling, H/D exchange, and collision induced dissociation experiments were conducted to facilitate the interpretation of structures and fragmentation processes. A multi-step (→ HCN + HC 2 N 2 − → CN − + 2 HCN) and/or single-step (→ CN − + 2 HCN) ring-opening collision-induced fragmentation process appears to exist for 1,3,5-triazinide. In addition to proton and hydride transfer reactions, the data indicate a competitive nucleophilic aromatic addition pathway (S N Ar) over a wide range of relative gas phase acidities to form strong anionic σ-adducts (Meisenheimer complexes). The significant hydride acceptor properties and stability of the anionic σ-adducts are rationalized by extremely electrophilic carbon centers and symmetric charge delocalization at the electron-withdrawing nitrogen positions. The types of anion-arene binding motifs and their influence on reaction pathways are discussed.

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Section: Potential Energy Surface Of 135-triazine Reactionsmentioning

confidence: 54%

Gas Phase Reactions of 1,3,5-Triazine: Proton Transfer, Hydride Transfer, and Anionic σ-Adduct Formation

Garver

Yang

Kato

et al. 2011

J. Am. Soc. Mass Spectrom.

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“…In principle, melamine can exist in different tautomers (Fig. (C)) . Comparing both tautomeric forms, the structure with − NH 2 groups is more stable .…”

Section: Resultsmentioning

confidence: 99%

High‐throughput screening of measuring conditions for an optimized SERS detection

Kämmer

Olschewski

Rösch

et al. 2015

J Raman Spectroscopy

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Surface‐enhanced Raman spectroscopy (SERS) is a perfect method for analytical applications because of delivering specific molecular information combined with a high sensitivity when applying rational design metallic nanostructures. However, the pH level and the activation of ctheir mutual influence. Besidesolloidal SERS substrates influence the sensitivity and comparability of the SERS analysis. In this study, a routine is presented that allows for a fast and effective recognition of the influences of pH and activating agents on the SERS signal of an analyte molecule. To do so, a citrate‐reduced Ag colloid served as SERS substrate. The influence of four activating agents as well as five pH levels on the SERS signal of the model analyte melamine was investigated. Here, not only the influence of the anion but also that of the cation of the activating agents was examined. In addition to different signal intensities, a shift of the dominant melamine signal occurred depending on the adjusted conditions. At pH 11, the lowest intensities of the SERS signal from the model analyte melamine were detected. The maximal enhancement of the ring breathing II mode in combination with this specific colloid was achieved using sodium chloride as an activating agent at a pH level of 5. Thus, the study introduces a routine, which can be applied on various analyte molecules to optimize the SERS intensity by changing the activation agent as well as the pH. Copyright © 2015 John Wiley & Sons, Ltd.

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“…These complexes are very promising light-emitting materials because of their good thermal stability [5]. The thermochemical properties of cyanuric acid were characterized using mass spectrometry measurements along with computational studies was already reported by Mukherjee and Ren [6]. Cyanuric acid is a triazine derivative and may also be described as two structural isomers, the enol-like triazine-triol and the keto-like tautomer.…”

Section: Introductionmentioning

confidence: 98%

Spectral and Thermal Degradation of Melamine Cyanurate

Sangeetha¹,

Kanagathara

Sumathi

et al. 2013

Journal of Materials

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Melamine cyanurate, an organic crystalline complex was, synthesized by evaporation of an aqueous solution containing equimolar quantities of melamine and cyanuric acid. The synthesized compound has been subjected to various characterizations like Powder XRD, FT-IR, TG-DTG, SEM, and SHG. The presence of sharp diffraction peaks in the XRD confirms that the products are highly crystalline. The average particle size was calculated using the Debye-Scherrer formula, and it was found to be 3.067 m. Thermal behavior of the grown crystal has been studied by TG-DTG analysis. From TG-DTG, it is found that the title crystal possesses good thermal stability. The activation energy was calculated using the Broido, Coats-Redfern, and Horowitz-Metzger methods. A sharp peak exothermic peak at 405.40 ∘ C was assigned as the melting point of the title material. SEM reveals the morphology of the synthesized salt. No detectable signal was observed during the Kurtz-Perry technique.

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Gas-phase acid-base properties of melamine and cyanuric acid

Cited by 24 publications

References 53 publications

Gas Phase Reactions of 1,3,5-Triazine: Proton Transfer, Hydride Transfer, and Anionic σ-Adduct Formation

Gas Phase Reactions of 1,3,5-Triazine: Proton Transfer, Hydride Transfer, and Anionic σ-Adduct Formation

High‐throughput screening of measuring conditions for an optimized SERS detection

Spectral and Thermal Degradation of Melamine Cyanurate

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