Polyarene-based π-conjugated systems: synthesis, characterization, and mechanistic studies

Wang, Cheng (2019) Polyarene-based π-conjugated systems: synthesis, characterization, and mechanistic studies. Doctoral (PhD) thesis, Memorial University of Newfoundland.

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Abstract

This thesis mainly deals with the synthesis and characterization of arenebased π-conjugated systems. The content can be divided into three major parts. In the first section, a series of tetraaryl-anthraquinodimethane derivatives (Ar₄-AQs) was synthesized via Suzuki coupling reactions, and these compounds were subjected to intramolecular cyclization reactions under chemical and photochemical conditions with the aim of making highly π-delocalized polycyclic aromatic hydrocarbons (PAHs). The Ar₄-AQs and their cyclized products were investigated by various spectroscopic analyses, including NMR, UV-Vis absorption spectroscopy, and X-ray crystallography to understand their structural, electronic, and photochemical properties. In the second part, microporous organic cross-linked polymer networks were successfully prepared from Schiff base condensation of a tetrabis(carboxaldehyde)-substituted Ar₄-AQ and para-phenylenediamine. Under optimized conditions, the resulting microporous organic materials showed good microporosity and crystallinity. In the third section, the detailed reaction mechanisms of intramolecular alkyne-dithiolium [3+2] cycloaddition reactions were investigated by a joint experimental and theoretical approach. A number of alkynyl-subsituted phenyldithiafulvenes was prepared as model compounds. Density functional theory (DFT) calculations were performed to reveal the effects of pH and degree of π- conjugation on reactivity.

Item Type: Thesis (Doctoral (PhD))
URI: http://research.library.mun.ca/id/eprint/14414
Item ID: 14414
Additional Information: Includes bibliographical references (pages 139-168).
Keywords: Polyarene, pi-Conjugated Systems, photo reaction, COFs
Department(s): Science, Faculty of > Chemistry
Date: August 2019
Date Type: Submission
Library of Congress Subject Heading: Conjugated polymers--Mechanical properties; Polycyclic aromatic hydrocarbons--Mechanical properties.

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