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https://doi.org/10.5562/cca2397

Ring-Current Assessment of the Annulene-Within-an-Annulene Model for some Large Coupled Super-Ring Conjugated-Systems

Timothy K. Dickens ; University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, England, United Kingdom
Roger B. Mallion ; School of Physical Sciences, University of Kent, Canterbury CT2 7NH, England, United Kingdom

Puni tekst: engleski, pdf (4 MB) str. 221-232 preuzimanja: 688* citiraj
APA 6th Edition
Dickens, T.K. i Mallion, R.B. (2014). Ring-Current Assessment of the Annulene-Within-an-Annulene Model for some Large Coupled Super-Ring Conjugated-Systems. Croatica Chemica Acta, 87 (3), 221-232. https://doi.org/10.5562/cca2397
MLA 8th Edition
Dickens, Timothy K. i Roger B. Mallion. "Ring-Current Assessment of the Annulene-Within-an-Annulene Model for some Large Coupled Super-Ring Conjugated-Systems." Croatica Chemica Acta, vol. 87, br. 3, 2014, str. 221-232. https://doi.org/10.5562/cca2397. Citirano 28.02.2021.
Chicago 17th Edition
Dickens, Timothy K. i Roger B. Mallion. "Ring-Current Assessment of the Annulene-Within-an-Annulene Model for some Large Coupled Super-Ring Conjugated-Systems." Croatica Chemica Acta 87, br. 3 (2014): 221-232. https://doi.org/10.5562/cca2397
Harvard
Dickens, T.K., i Mallion, R.B. (2014). 'Ring-Current Assessment of the Annulene-Within-an-Annulene Model for some Large Coupled Super-Ring Conjugated-Systems', Croatica Chemica Acta, 87(3), str. 221-232. https://doi.org/10.5562/cca2397
Vancouver
Dickens TK, Mallion RB. Ring-Current Assessment of the Annulene-Within-an-Annulene Model for some Large Coupled Super-Ring Conjugated-Systems. Croatica Chemica Acta [Internet]. 2014 [pristupljeno 28.02.2021.];87(3):221-232. https://doi.org/10.5562/cca2397
IEEE
T.K. Dickens i R.B. Mallion, "Ring-Current Assessment of the Annulene-Within-an-Annulene Model for some Large Coupled Super-Ring Conjugated-Systems", Croatica Chemica Acta, vol.87, br. 3, str. 221-232, 2014. [Online]. https://doi.org/10.5562/cca2397

Sažetak
The Annulene-Within-an-Annulene (AWA) model for conjugated super-ring systems, proposed by Barth and Lawton nearly fifty years ago, is further tested on six newly considered ‘coupled’ structures by means of π-electron ring-currents and bond-currents calculated via the Hückel–London–Pople–McWeeny (HLPM) formalism. Super-ring systems are said to be decoupled when the bonds connecting the central ring to the outer perimeter never appear as anything other than single bonds in any Kekulé structure that can be devised for the system as a whole. The preliminary conclusions of other recent inves¬tigations — by the same HLPM method and by ipso-centric ab-initio approaches — are verified. Phenyl-ene-[5]-circulene, a (coupled) alternant isomer of the much-studied (decoupled) non-alternant system [10,5]-coronene, is also considered. It is advised that the AWA model should in future either be used with consider¬able caution in very specific circumstances, or it should be abandoned altogether.

Ključne riječi
HLPM ring-currents & bond-currents; graph theory; conjugated hydrocarbons; coupled & decoupled super-ring systems; annulene-within-an-annulene rule

Hrčak ID: 130429

URI
https://hrcak.srce.hr/130429

Posjeta: 909 *