Pyrolytic decarboxylation of aromatic acids as a means of isotopic analysis

Santrock, Jeffrey; Hayes, John M.

doi:10.1021/ac00284a059

Cited by 17 publications

(26 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The d 18 O-value (difference) of both benzoic acid lab standards was confirmed by an independent method (off-line decarboxylation; Santrock and Hayes, 1985) by A. Schimmelmann (Indiana University, Bloomington, USA; Brand, Schimmelmann) (Werner to be published). The standardisation scheme of the carbon reduction measurements (analogous to that described by Kornexl et al, 1999b) included the required SLAP/V-SMOW normalisation (Coplen, 1988), and the measurement strategy and calculation of d 18 Ovalues was analogous to that described by Werner and Brand (2001 …”

Section: O-value Analysis By Irmsmentioning

confidence: 79%

Biosynthesis of gallic acid in Rhus typhina: discrimination between alternative pathways from natural oxygen isotope abundance

et al. 2004

View full text Add to dashboard Cite

Section: O-value Analysis By Irmsmentioning

confidence: 79%

Biosynthesis of gallic acid in Rhus typhina: discrimination between alternative pathways from natural oxygen isotope abundance

et al. 2004

View full text Add to dashboard Cite

“…The IAEA‐601 and IAEA‐602 benzoic acids showed a significant difference from referenced values, with offsets of 1.8‰ ( n = 3) and 1.6‰ ( n = 3), respectively (Table 1). Prior work has suggested that volatile compounds (e.g., benzoic acid, benzophenone) decompose differentially under HgCl 2 pyrolysis;30 thus, researchers have preferably utilized the decarboxylation method 22. We observed the following aspects, which resulted in lowered CO 2 recoveries (<93%) and affected the observed δ 18 O values of benzoic acids: (1) electrostatic substrate adhered to ampule walls and partially decomposed during ampule 'necking' with a torch, (2) variable losses of substrate during the water removal step (100°C, under vacuum) due to volatilization, and (3) carbonaceous deposits upon pyrolysis may have created a reactive surface for carbon oxides.…”

Section: Resultsmentioning

confidence: 99%

“…All glass (quartz) used in the reactions was subject to rigorous cleaning in order to remove impurities and eliminate potential reactive surfaces. In brief, quartz tubes were heated to 550°C for 6 h in a muffle furnace, rinsed with distilled‐deionized (DDI) water, soaked overnight in hydrochloric acid, triple rinsed with DDI, rinsed with 100% ethanol, and heated to 550°C for 6 h, then held under vacuum in a desiccator until use 22. The nickel (Ni) reagent was prepared from high‐purity nickel hydroxide followed by reduction to fine Ni powder under hydrogen atmosphere according to the method of Schimmelmann and DeNiro:4 …”

Section: Methodsmentioning

confidence: 99%

Offline oxygen isotope analysis of organic compounds with high N:O

Hunsinger

Hagopian

Jahren

2010

Rapid Commun. Mass Spectrom.

View full text Add to dashboard Cite

Although the advantages of online δ(18)O analysis of organic compounds make its broad application desirable, researchers have encountered NO(+) isobaric interference with CO(+) at m/z 30 (e.g. (14)N(16)O(+), (12)C(18)O(+)) when analyzing nitrogenous substrates. If the δ(18)O value of inter-laboratory standards for substrates with high N:O value could be confirmed offline, these materials could be analyzed periodically and used to evaluate δ(18)O data produced online for nitrogenous unknowns. To this end, we present an offline method based on modifications of the methods of Schimmelmann and Deniro (Anal. Chem. 1985; 57: 2644) and Sauer and Sternberg (Anal. Chem. 1994; 66: 2409), whereby all the N(2) from the gas products of a chlorinated pyrolysis was eliminated, resulting in purified CO(2) for analysis via a dual-inlet isotope ratio mass spectrometry system. We evaluated our method by comparing observed δ(18)O values with previously published or inter-laboratory calibrated δ(18)O values for five nitrogen-free working reference materials; finding isotopic agreement to within ±0.2‰ for SIGMA® cellulose, IAEA-CH3 cellulose (C(6)H(10)O(5)) and IAEA-CH6 sucrose (C(12)H(22)O(11)), and within ±1.8‰ for IAEA-601 and IAEA-602 benzoic acids (C(7)H(6)O(2)). We also compared the δ(18)O values of IAEA-CH3 cellulose and IAEA-CH6 sucrose that was nitrogen-'doped' with adenine (C(5)H(5)N(5)), imidazole (C(3)H(4)N(2)) and 2-aminopyrimidine (C(4)H(5)N(3)) with the undoped δ(18)O values for the same substrates; yielding isotopic agreement to within ±0.7‰. Finally, we provide an independent analysis of the δ(18)O value of IAEA-600 caffeine (C(8)H(10)N(4)O(2)), previously characterized using online systems exclusively, and discuss the reasons for an average 1.4‰ enrichment in δ(18)O observed offline relative to the consensus online δ(18)O value.

show abstract

“…A complete monolayer h‐BN was firstly deposited on the Cu foil substrate by using boron nitride as precursor. The subsequent graphene growth was realized by using benzoic acid as precursor, which could decompose into carbon dioxide (CO 2 ) and various hydrocarbon species on pyrolysis above 500 °C . The released CO 2 was then used as an etchant of the redeposited h‐BN film as shown in the equation below when the reaction temperature exceeded 900 °C.…”

Section: Designed Approaches For Vertically Stacked Heterostructures mentioning

confidence: 99%

Hexagonal Boron Nitride–Graphene Heterostructures: Synthesis and Interfacial Properties

Liu

Zhang

et al. 2015

Small

148

100

View full text Add to dashboard Cite

Research on in-plane and vertically-stacked heterostructures of graphene and hexagonal boron nitride (h-BN) have attracted intense attentions for energy band engineering and device performance optimization of graphene. In this review article, recent advances in the controlled syntheses, interfacial structures, and electronic properties, as well as novel device constructions of h-BN and graphene heterostructures are highlighted. Firstly, diverse synthesis approaches for in-plane h-BN and graphene (h-BN-G) heterostructures are reviewed, and their applications in nanoelectronics are briefly introduced. Moreover, the interfacial structures and electronic properties of h-BN-G heterojunctions are discussed, and a zigzag type interface is found to preferentially evolve at the linking edge of the two structural analogues. Secondly, several synthetic routes for the vertically-stacked graphene/h-BN (G/h-BN) heterostructures are also reviewed. The role of h-BN as perfect dielectric layers in promoting the device performance of graphene is presented. Finally, future research directions in the synthesis and application of such heterostructures are discussed.

show abstract

Pyrolytic decarboxylation of aromatic acids as a means of isotopic analysis

Cited by 17 publications

References 23 publications

Biosynthesis of gallic acid in Rhus typhina: discrimination between alternative pathways from natural oxygen isotope abundance

Biosynthesis of gallic acid in Rhus typhina: discrimination between alternative pathways from natural oxygen isotope abundance

Offline oxygen isotope analysis of organic compounds with high N:O

Hexagonal Boron Nitride–Graphene Heterostructures: Synthesis and Interfacial Properties

Contact Info

Product

Resources

About