Angular ladder-type meta -phenylenes: synthesis and electronic structural analysis
Herein, we report the synthesis of two new series of angular (all-syn) ladder-type -[n]phenylenes (LMP, n = 3-8). One series contains keto groups at the termini bridges, denoted angular keto (AKn), the second contains alkyl groups at all bridge sp carbons, denoted angular alkyl (AAn). Their electron...
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| Veröffentlicht in: | Organic Chemistry Frontiers 2020-10, Vol.7 (20), p.3215-3222 |
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| creator | Boddeda, Anitha Hossain, Mohammad Mosharraf Mirzaei, M Saeed Lindeman, Sergey V Mirzaei, Saber Rathore, Rajendra |
| description | Herein, we report the synthesis of two new series of angular (all-syn) ladder-type
-[n]phenylenes (LMP, n = 3-8). One series contains keto groups at the termini bridges, denoted angular keto (AKn), the second contains alkyl groups at all bridge sp
carbons, denoted angular alkyl (AAn). Their electronic and structural properties were delineated by a combination of electrochemistry and spectroscopic (UV-Vis and emission) methods and further supported by DFT calculations. Interestingly, experimental and DFT data show that changing the bridging group at the termini from alkyl (AAn) to keto (AKn) gives an increase in the first reduction potentials and LUMO energies, as the π-system is extended. Also, the charge (de)localization behavior is different for these two species; while the AAn compounds stablize charge with Robin-Day class III, the AKn compounds show a clear switch from class III to class II. In comparison with the linear analogues (LKn and LAn), DFT results reveal a shape independency of the charge (de)localization mechanism in acceptor-π-acceptor series (AKn/LKn). |
| doi_str_mv | 10.1039/d0qo00924e |
| format | Article |
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-[n]phenylenes (LMP, n = 3-8). One series contains keto groups at the termini bridges, denoted angular keto (AKn), the second contains alkyl groups at all bridge sp
carbons, denoted angular alkyl (AAn). Their electronic and structural properties were delineated by a combination of electrochemistry and spectroscopic (UV-Vis and emission) methods and further supported by DFT calculations. Interestingly, experimental and DFT data show that changing the bridging group at the termini from alkyl (AAn) to keto (AKn) gives an increase in the first reduction potentials and LUMO energies, as the π-system is extended. Also, the charge (de)localization behavior is different for these two species; while the AAn compounds stablize charge with Robin-Day class III, the AKn compounds show a clear switch from class III to class II. In comparison with the linear analogues (LKn and LAn), DFT results reveal a shape independency of the charge (de)localization mechanism in acceptor-π-acceptor series (AKn/LKn).</description><identifier>ISSN: 2052-4110</identifier><identifier>ISSN: 2052-4129</identifier><identifier>EISSN: 2052-4110</identifier><identifier>EISSN: 2052-4129</identifier><identifier>DOI: 10.1039/d0qo00924e</identifier><identifier>PMID: 33796320</identifier><language>eng</language><publisher>England: Royal Society of Chemistry</publisher><subject>Crystal structure ; Crystallography ; Electrochemistry ; Localization ; NMR ; Nuclear magnetic resonance ; Organic chemistry ; Structural analysis ; Synthesis</subject><ispartof>Organic Chemistry Frontiers, 2020-10, Vol.7 (20), p.3215-3222</ispartof><rights>Copyright Royal Society of Chemistry 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c321e-f8cad63fddaa24b9c3b69ba67ac007fd642012055aa7d91d51e20474787193253</citedby><cites>FETCH-LOGICAL-c321e-f8cad63fddaa24b9c3b69ba67ac007fd642012055aa7d91d51e20474787193253</cites><orcidid>0000-0001-9651-9197 ; 0000-0002-2633-5226 ; 0000-0003-3233-4411 ; 0000-0001-7387-7936 ; 0000-0002-6996-4209</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,778,782,883,27911,27912</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/33796320$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Boddeda, Anitha</creatorcontrib><creatorcontrib>Hossain, Mohammad Mosharraf</creatorcontrib><creatorcontrib>Mirzaei, M Saeed</creatorcontrib><creatorcontrib>Lindeman, Sergey V</creatorcontrib><creatorcontrib>Mirzaei, Saber</creatorcontrib><creatorcontrib>Rathore, Rajendra</creatorcontrib><title>Angular ladder-type meta -phenylenes: synthesis and electronic structural analysis</title><title>Organic Chemistry Frontiers</title><addtitle>Org Chem Front</addtitle><description>Herein, we report the synthesis of two new series of angular (all-syn) ladder-type
-[n]phenylenes (LMP, n = 3-8). One series contains keto groups at the termini bridges, denoted angular keto (AKn), the second contains alkyl groups at all bridge sp
carbons, denoted angular alkyl (AAn). Their electronic and structural properties were delineated by a combination of electrochemistry and spectroscopic (UV-Vis and emission) methods and further supported by DFT calculations. Interestingly, experimental and DFT data show that changing the bridging group at the termini from alkyl (AAn) to keto (AKn) gives an increase in the first reduction potentials and LUMO energies, as the π-system is extended. Also, the charge (de)localization behavior is different for these two species; while the AAn compounds stablize charge with Robin-Day class III, the AKn compounds show a clear switch from class III to class II. 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-[n]phenylenes (LMP, n = 3-8). One series contains keto groups at the termini bridges, denoted angular keto (AKn), the second contains alkyl groups at all bridge sp
carbons, denoted angular alkyl (AAn). Their electronic and structural properties were delineated by a combination of electrochemistry and spectroscopic (UV-Vis and emission) methods and further supported by DFT calculations. Interestingly, experimental and DFT data show that changing the bridging group at the termini from alkyl (AAn) to keto (AKn) gives an increase in the first reduction potentials and LUMO energies, as the π-system is extended. Also, the charge (de)localization behavior is different for these two species; while the AAn compounds stablize charge with Robin-Day class III, the AKn compounds show a clear switch from class III to class II. In comparison with the linear analogues (LKn and LAn), DFT results reveal a shape independency of the charge (de)localization mechanism in acceptor-π-acceptor series (AKn/LKn).</abstract><cop>England</cop><pub>Royal Society of Chemistry</pub><pmid>33796320</pmid><doi>10.1039/d0qo00924e</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0001-9651-9197</orcidid><orcidid>https://orcid.org/0000-0002-2633-5226</orcidid><orcidid>https://orcid.org/0000-0003-3233-4411</orcidid><orcidid>https://orcid.org/0000-0001-7387-7936</orcidid><orcidid>https://orcid.org/0000-0002-6996-4209</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Crystal structure Crystallography Electrochemistry Localization NMR Nuclear magnetic resonance Organic chemistry Structural analysis Synthesis |
| title | Angular ladder-type meta -phenylenes: synthesis and electronic structural analysis |
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