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|Type:||Artigo de periódico|
|Title:||Substituent Effects In Chain And Ring π-systems Studied By Core-electron Binding Energies Calculated By Density Functional Theory|
|Abstract:||The substituent effects of X- in 1-X-hexatrienes, which are chain π-systems with conjugated double bonds, was compared with those in PhX, which are ring π-systems, using core electron binding energy shifts (ΔCEBE) of the carbon atoms in the molecules. The ΔCEBE of C 1C 4 in 1-X-hexatrienes are generally close to ΔCEBE of C 1C 4 in PhX. The ΔCEBE of carbon atoms in the 1-X-hexatrienes are not only highly correlated to the Hammett σ substituent constants, but their numerical values are also close to each other. The core electron binding energies (CEBE) of the six carbons in 1-X-hexatriynes, which are the chain π-systems with conjugated triple bonds, were calculated by density functional theory (DFT) and the substituent effect was investigated. Average ΔCEBE of the five carbon atoms between C 2 and C 6 in 1-X-hexatriyne were calculated. The magnitude and sign of the average ΔCEBE provides quantitative strength and direction, electron withdrawing or donating, of a substituent X. © 2011.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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