Dismantling the Hyperconjugation of π-Conjugated Phosphorus Heterocycles |
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Authors: | Dr Olatz Larrañaga Dr Carlos Romero-Nieto Dr Abel de Cózar |
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Institution: | 1. Departamento de Química Orgánica I Facultad de Química, Universidad del País Vasco and Donostia International Physics Center (DIPC), P.K. 1072, San Sebastián-Donostia, E-20018 Spain;2. Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, Heidelberg, 69120 Germany |
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Abstract: | The development of π-extended phosphorus heterocycles has been rapidly increasing because of their unique optoelectronics properties, which are very often considered to be a consequence of special hyperconjugative interactions. However, the latter interactions have primarily been investigated within the five-membered species, phospholes, and they are often conceptually extrapolated to the rest of π-extended phosphorus heterocycles (including six-membered P-heterocycles) despite evident structural differences. Herein, we report, for the first time, a detailed investigation that sheds light on the hyperconjugative effects of a series of phosphorus heterocyclic systems by means of EDA and NBO calculations within a DFT framework. Our results lay the foundations for the future design of π-extended phosphorus heterocycles with improved optoelectronics properties. |
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Keywords: | density functional calculations energy decomposition analysis hyperconjugation phosphorus second-order perturbation theory |
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