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Comparative studies of the behavior of neutral and ionic ferrocene derivatives under different conditions of electrospray ionization

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Abstract

We have studied the behavior of ferrocene CpFeCp (FcH), ferrocenium triiodide [FcH]+I 3 , dimethylaminomethylferrocene FcCH2NMe2 and its trimethylammonium salt [FcCH2NMe3]+I under the conventional conditions of electrospray ionization (ESI), when the substance solution is subjected to spraying, and in two versions of desorption electrospray ionization (DESI), when the sprayed solvent bombards the surface of solid or liquid samples. In addition to these techniques, the behavior of neutral compounds under conditions of electrospray ionization of vapors of the studied compounds in a gas phase (ESI_V) has been investigated. It has been shown using the examples of ferrocene and its dimethylaminomethyl derivative that the detection limits for these compounds occurring in a gas phase are comparable within an order of magnitude with their detection limits under the ESI and DESI conditions of solid and liquid samples. The high effectiveness of ionization of analyte vapors makes it possible to use the ESI method not only in combination with liquid (conventional ESI technology) and thin layer chromatography (DESI), but also with gas liquid chromatography (ESI_V). Thus, the electrospray ionization becomes a universal method allowing studies of a compound under the natural conditions in any state of aggregation, that is, solid, liquid, and gas. With the help of statistical methods for designing experiments (complete factorial experiment), quantitative evaluation of the influence of experimental parameters on the ion-formation processes under different ESI conditions has been carried out, which makes it possible to purposefully select the optimal conditions to record the ESI mass spectra with a minimum number of experiments. Moreover, analysis of the dependences of the mass spectra on the experimental parameters can serve as an instrument for studying the details of the ion-formation mechanisms depending upon different ways of ionization.

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Correspondence to Yu. S. Nekrasov.

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Original Russian Text © Yu.S. Nekrasov, N.S. Ikonnikov, Yu.A. Belousov, S.S. Kiselev, 2010, published in Mass-spektrometria, No. 7(4), pp. 271–277.

The article was translated by the authors.

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Nekrasov, Y.S., Ikonnikov, N.S., Belousov, Y.A. et al. Comparative studies of the behavior of neutral and ionic ferrocene derivatives under different conditions of electrospray ionization. J Anal Chem 66, 1291–1297 (2011). https://doi.org/10.1134/S1061934811130132

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  • DOI: https://doi.org/10.1134/S1061934811130132

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