Return to search

DEVELOPMENT OF A SYNTHETIC METHOD FOR 2-TETRAZENES AND EXAMINATION OF THE MASS SPECTROMETRIC BEHAVIOR OF IONIZED 2-TETRAZENES AND ASPHALTENE MODEL

<p> 2-Tetrazens are often used as high energy-density materials. Only a few synthetic methods  exist for making them. Further, their structure-property relationships remain largely unexplored.  Asphaltenes are usually a complex mixture found in the heaviest fraction of heavy crude oil. Their structural characterization and understanding have become a pertinent task for petroleum industry  around the world. Mass spectrometry is a powerful analytical tool for the detection and  characterization of unknown compounds even in complex mixtures. It features high sensitivity and  speed and can provide a variety of valuable information for different types of analytes. This thesis  focuses on the development of an effective synthetic method for 2-tetrazenes and the mass  spectrometry study of the ionized 2-tetrazenes. In addition, the mass spectrometric behavior of  ionized asphaltene model compounds are also discussed in this thesis. Chapter 2 describes the instrumentation and fundamental aspects of the mass spectrometers used in the research discussed in this thesis. Chapter3 introduces an effective synthetic method for  2-tetrazens based on iodine-mediated oxidative N-N coupling reaction of hydrazines. Chapter 4  presents the fragmentation behavior of ionized 2-tetrazenes in tandem mass spectrometry experiments. Upon collision-activated dissociation (CAD), ionized alkyl-substituted linear 2- tetrazenes underwent simpler fragmentation reactions than the ionized aromatic 2-tetrazenes or a  cyclic 2-tetrazene. The observations were rationalized by using quantum chemical calculations.  Chapter 5 presents the fragmentation behavior of ionized asphaltene model compounds under  medium-energy collision-activated dissociation (MCAD). The comparison between the different  behaviors of the molecular radical cations of these compounds provided useful information for the  identification of related unknown compound </p>

  1. 10.25394/pgs.21343311.v1
Identiferoai:union.ndltd.org:purdue.edu/oai:figshare.com:article/21343311
Date17 October 2022
CreatorsHao-Ran Lei (13965753)
Source SetsPurdue University
Detected LanguageEnglish
TypeText, Thesis
RightsCC BY 4.0
Relationhttps://figshare.com/articles/thesis/DEVELOPMENT_OF_A_SYNTHETIC_METHOD_FOR_2-TETRAZENES_AND_EXAMINATION_OF_THE_MASS_SPECTROMETRIC_BEHAVIOR_OF_IONIZED_2-TETRAZENES_AND_ASPHALTENE_MODEL/21343311

Page generated in 0.0021 seconds