{"title":"A DFT Study of Mono-, Bi- and Tricyclic Examples of \nSemi-conjugated Heterocyclic Mesomeric Betaines","authors":"Christopher A. Ramsden, W. P. Oziminski","doi":"10.24820/ark.5550190.p012.224","DOIUrl":null,"url":null,"abstract":"The properties of heterocyclic mesomeric betaines (HMBs) are determined by the connectivity between the ring 2 π heteroatoms and the odd conjugated fragments that complete the ring. In contrast to conjugated HMBs (1,3-dipoles) and cross-conjugated HMBs (1,4-dipoles), semi-conjugated HMBs are a class of heterocycle that is unexplored. The only known example is 1,4-dimethyl-1,2,4,5-tetrazinium-3,6-diolate. In this study density functional theory (DFT) methodology is employed to further investigate the structures and properties of examples of mono- bi-and tricyclic semi-conjugated HMBs. A common feature associated with the ‘semi - conjugation’ is a small energy gap between the frontier orbitals","PeriodicalId":0,"journal":{"name":"","volume":" 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.24820/ark.5550190.p012.224","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The properties of heterocyclic mesomeric betaines (HMBs) are determined by the connectivity between the ring 2 π heteroatoms and the odd conjugated fragments that complete the ring. In contrast to conjugated HMBs (1,3-dipoles) and cross-conjugated HMBs (1,4-dipoles), semi-conjugated HMBs are a class of heterocycle that is unexplored. The only known example is 1,4-dimethyl-1,2,4,5-tetrazinium-3,6-diolate. In this study density functional theory (DFT) methodology is employed to further investigate the structures and properties of examples of mono- bi-and tricyclic semi-conjugated HMBs. A common feature associated with the ‘semi - conjugation’ is a small energy gap between the frontier orbitals