alexa Mass spectrometric approaches for the investigation of dynamic processes in condensed phase.
Chemistry

Chemistry

Organic Chemistry: Current Research

Author(s): Fabris D

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Abstract Mass spectrometry (MS) offers many advantages over other established spectroscopic techniques employed for the investigation of processes in condensed phase. The sensitivity, specificity, and speed afforded by MS-based methods enable to obtain very valuable insights into the mechanism of complex dynamic processes. Off-line methods rely on quenching to halt the progress of the reaction of interest and allow for the implementation of a broad range of analytical procedures for sample fractionation, isolation, or desalting. On the contrary, on-line methods are designed to carry out the real-time monitoring of dynamic processes through a continuous uninterrupted analysis of reaction mixtures, with the only caveat that the sample solutions be directly amenable to the available ionization technique. The utilization of rapid mixing devices in direct connection with a mass spectrometer or included in off-line schemes provides access to the initial moments of a reaction, which can offer very important information about the reaction mechanism. This report summarizes the different off- and on-line strategies developed to study chemical and biochemical reactions in solution and obtain kinetic/mechanistic information. The merits of the various experimental designs, the characteristics of the different instrumental setups, and the factors affecting time resolution are discussed with the aid of specific examples, which highlight the contributions of MS to the different facets of the investigation of dynamic processes in condensed phase. 2004 Wiley Periodicals, Inc. This article was published in Mass Spectrom Rev and referenced in Organic Chemistry: Current Research

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