{"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":["Chunyan Chi"],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021-01-22","date_published":"2021-01-22","updated_at":"2026-08-21T16:47:09Z","subjects":["quinodimethane, quinoidal polycyclic/heterocyclic hydrocarbon, pro-aromatic, diradical, dipolar/zwitterionic, structure-property relationship"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarbank.nus.edu.sg/handle/10635/204278","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"source_record":{"url":"https://scholarbank.nus.edu.sg/oai/request?verb=GetRecord&metadataPrefix=dim&identifier=oai%3Ascholarbank.nus.edu.sg%3A10635%2F204278","prefix":"dim"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.other","label":"Dc Contributor Other","values":["CHEMISTRY"]},{"key":"dc:contributor.supervisor","label":"Supervisor","values":["Chunyan Chi"]},{"key":"dc:creator","label":"Author","values":["KUEH WEIXIANG"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2021-10-26T18:00:26Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2021-10-26T18:00:26Z"]},{"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":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"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","https://scholarbank.nus.edu.sg/handle/10635/204278"]}]},{"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. 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