{"id":{"repo_id":"nus","oai_identifier":"oai:scholarbank.nus.edu.sg:10635/204278"},"canonical_url":"https://search.dev.ndltd.org/etd/nus/oai:scholarbank.nus.edu.sg:10635/204278","repository":{"repo_id":"nus","name":"National University of Singapore","base_url":"https://scholarbank.nus.edu.sg/oai/request"},"display":{"title":"QUINODIMETHANES - AN EFFECTIVE STABILIZATION STRATEGY FOR POLYCYCLIC AROMATIC HYDROCARBONS","abstract":"The union of a quinodimethane (QDM) core with a polycyclic aromatic hydrocarbon (PAH) framework led to the birth of a new class of quinoidal polycyclic/heterocyclic hydrocarbons (PHs) with numerous potential applications in materials chemistry. Over the years, intensive research efforts involving experimental and theoretical based investigative studies have strived to paint a complete picture of the intricate structure-diradical character-physical property relationship of these interesting quinoidal compounds. This would greatly aid in the future tailor-design and synthesis of functional PH based materials. In this thesis, we focused on the ground state tuning of a series of sulfur and nitrogen-containing quinoidal heteroacene analogues containing a rare mix of both diradical and dipolar/zwitterionic characters, and conducted systematic investigations on how their complex structure-property relationship changes with various structural modifications to their 1. QDM chain length, 2. QDM fusion mode, 3. number of aromatic sextet rings and 4. heteroatom type.","abstract_html":"The union of a quinodimethane (QDM) core with a polycyclic aromatic hydrocarbon (PAH) framework led to the birth of a new class of quinoidal polycyclic/heterocyclic hydrocarbons (PHs) with numerous potential applications in materials chemistry. Over the years, intensive research efforts involving experimental and theoretical based investigative studies have strived to paint a complete picture of the intricate structure-diradical character-physical property relationship of these interesting quinoidal compounds. This would greatly aid in the future tailor-design and synthesis of functional PH based materials. In this thesis, we focused on the ground state tuning of a series of sulfur and nitrogen-containing quinoidal heteroacene analogues containing a rare mix of both diradical and dipolar/zwitterionic characters, and conducted systematic investigations on how their complex structure-property relationship changes with various structural modifications to their 1. QDM chain length, 2. QDM fusion mode, 3. number of aromatic sextet rings and 4. heteroatom type.","abstract_has_math":false,"creators":["KUEH WEIXIANG"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021-01-22","date_published":"2021-01-22","updated_at":"2026-07-24T03:30:34Z","subjects":["quinodimethane, quinoidal polycyclic/heterocyclic hydrocarbon, pro-aromatic, diradical, dipolar/zwitterionic, structure-property relationship"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["KUEH WEIXIANG"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["2021-01-22"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://scholarbank.nus.edu.sg/handle/10635/204278"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["quinodimethane, quinoidal polycyclic/heterocyclic hydrocarbon, pro-aromatic, diradical, dipolar/zwitterionic, structure-property relationship"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://scholarbank.nus.edu.sg/bitstreams/c95bbb7e-1576-412c-b76b-02a87d98fe18/download"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The union of a quinodimethane (QDM) core with a polycyclic aromatic hydrocarbon (PAH) framework led to the birth of a new class of quinoidal polycyclic/heterocyclic hydrocarbons (PHs) with numerous potential applications in materials chemistry. Over the years, intensive research efforts involving experimental and theoretical based investigative studies have strived to paint a complete picture of the intricate structure-diradical character-physical property relationship of these interesting quinoidal compounds. This would greatly aid in the future tailor-design and synthesis of functional PH based materials. In this thesis, we focused on the ground state tuning of a series of sulfur and nitrogen-containing quinoidal heteroacene analogues containing a rare mix of both diradical and dipolar/zwitterionic characters, and conducted systematic investigations on how their complex structure-property relationship changes with various structural modifications to their 1. QDM chain length, 2. QDM fusion mode, 3. number of aromatic sextet rings and 4. heteroatom type."]},{"key":"dc:format.checksum.md5","label":"Dc Format Checksum Md5","values":["80f7bdb0193fe6572ba44a7b2ae80185","d69203860cda0217aeefe87774f5b9fe"]},{"key":"dc:title","label":"Title","values":["QUINODIMETHANES - AN EFFECTIVE STABILIZATION STRATEGY FOR POLYCYCLIC AROMATIC HYDROCARBONS"]}]}],"canonical_facts":{"dc:creator":["KUEH WEIXIANG"],"dc:date.issued":["2021-01-22"],"dc:description.abstract":["The union of a quinodimethane (QDM) core with a polycyclic aromatic hydrocarbon (PAH) framework led to the birth of a new class of quinoidal polycyclic/heterocyclic hydrocarbons (PHs) with numerous potential applications in materials chemistry. Over the years, intensive research efforts involving experimental and theoretical based investigative studies have strived to paint a complete picture of the intricate structure-diradical character-physical property relationship of these interesting quinoidal compounds. This would greatly aid in the future tailor-design and synthesis of functional PH based materials. In this thesis, we focused on the ground state tuning of a series of sulfur and nitrogen-containing quinoidal heteroacene analogues containing a rare mix of both diradical and dipolar/zwitterionic characters, and conducted systematic investigations on how their complex structure-property relationship changes with various structural modifications to their 1. QDM chain length, 2. QDM fusion mode, 3. number of aromatic sextet rings and 4. heteroatom type."],"dc:format.checksum.md5":["80f7bdb0193fe6572ba44a7b2ae80185","d69203860cda0217aeefe87774f5b9fe"],"dc:identifier.uri":["https://scholarbank.nus.edu.sg/bitstreams/c95bbb7e-1576-412c-b76b-02a87d98fe18/download"],"dc:relation.isreferencedby":["https://scholarbank.nus.edu.sg/handle/10635/204278"],"dc:subject":["quinodimethane, quinoidal polycyclic/heterocyclic hydrocarbon, pro-aromatic, diradical, dipolar/zwitterionic, structure-property relationship"],"dc:title":["QUINODIMETHANES - AN EFFECTIVE STABILIZATION STRATEGY FOR POLYCYCLIC AROMATIC HYDROCARBONS"],"dc:type":["Thesis"]},"updated_at":"2026-07-24T03:30:34Z"}