Reactions of MoO2Cl2 and MoOCl4 with 2-Mercaptopyridine, 4-Phenylimidazole-2-thiol and 6-Mercaptopurine Monohydrate

MoO2Cl2/MoOCl4 have been reacted with 4-phenylimidazole-2-thiol/6-mercaptopurine monohydrate/2-mercaptopyridine in acetonitrile solvent in unimolar/bimolar proportions at room temperature. The products thus obtained are: MoOCl3(C9H8N2S), [1]; Mo2O3Cl6(C9H7N2S)(CH3CN)2, [2]; Mo2O3Cl8(C9H7N2S)2(CH3CN)2, [3] and Mo2O4Cl4(C5H4NS-SN4C5), [4]. These products were studied by various techniques: infrared, proton NMR, liquid/gas chromatography-mass spectrometry, elemental analyses. Owing to the sensitivity of the products to air and moisture, the reactions and work ups were performed in vacuum line purged with oxygen by flushing dry nitrogen in it. Ions observed in mass spectrum are concurrent with the depicted formulae.

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Volatile products from room temperature autoxidation ofcis, cis-6, 9-octadecadiene. Analysis by combined gas chromatography-mass spectrometry

Journal of the American Oil Chemists Society ◽

10.1007/bf02545002 ◽

1969 ◽

Vol 46 (6) ◽

pp. 273-276 ◽

Cited By ~ 4

Author(s):

R. J. Horvat ◽

W. H. Mcfadden ◽

H. Ng ◽

A. Lee ◽

G. Fuller ◽

...

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Room Temperature ◽

Gas Chromatography Mass Spectrometry ◽

Chromatography Mass Spectrometry ◽

Volatile Products

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A Novel Approach of Matching Mass-to-Charge Ratio for Compound Identification in Gas Chromatography–Mass Spectrometry

Journal of AOAC International ◽

10.5740/jaoacint.18-0261 ◽

2019 ◽

Vol 102 (2) ◽

pp. 638-645

Author(s):

Chengyi Xie ◽

Jiancheng Yu ◽

Song Huang ◽

Wenqing Gao ◽

Keqi Tang

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Mass Spectrum ◽

Charge Ratio ◽

Gas Chromatography Mass Spectrometry ◽

Computational Time ◽

Spectral Library ◽

Compound Identification ◽

Chromatography Mass Spectrometry ◽

Speed Up

Abstract Background: Gas chromatography–mass spectrometry (GC-MS) is one of the mostwidely used analytical techniques for analyzing chemical or biological samples in many fields. One of the most important approaches for the identification of compound in GC-MS is to compare an experimental mass spectrum with a compound recorded in a reference spectral library through a spectrum-matching algorithm. Objective: To develop a novel method to speed up compound identification. Method: In this study, a method based on m/z matching is proposed. Weselected the highest m/z values and m/z values corresponding to the largest peak intensities of a mass spectrum and stepwise modified the matching threshold (MTh) based on the principle of local optimum in the pre-search process. The performance of the approach is evaluated using the mass spectral library maintained by the National Institute of Standards and Technology asa reference library and repetitive mass spectra as query spectra. Results: Compared with two-step spectral library pre-search and “ten peaks,” the method based on m/z matching has higher accuracy, smaller number of remaining (missing) spectra, and shorter computational time. Conclusions: Therefore, the method can effectively speed up compound identification. Highlights: A method based on m/z matching is proposed. The accuracy is higher, the number of remaining spectra is less, and the computational time is shorter.

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