Substituent Effect Transmission Power of Alkyl, Alkenyl, Alkynyl, Phenyl, Thiophenyl and Polyacene Spacers.

08:00 EDT 11th April 2019 | BioPortfolio

Summary of "Substituent Effect Transmission Power of Alkyl, Alkenyl, Alkynyl, Phenyl, Thiophenyl and Polyacene Spacers."

The transmission of substituent effect through a variety of spacers viz. alkyl, alkenyl, alkynyl, phenyl, thiophenyl, and polyacene has been studied by modeling Y-G-X type molecular systems (Y- reaction center, G - spacer moiety and X - substituent) using B3LYP/6-31G(d,p) density functional theory. The reaction center is always kept as a CC double bond and the molecular electrostatic potential (MESP) minimum (Vmin) observed for this bond showed subtle variation with respect to the changes in the spacer unit and the nature of substituent. Strong linear correlations are observed between Hammett substituent constants (σI and σp) and Vmin, which recommend the aptness of Vmin as an electronic descriptor to quantify the substituent effect. Since Vmin offers an alternative measure of substituent effect, the correlation between Vmin and σp has been used for assessing the transmission of substituent effect through a variety of spacer moieties. The highest transmission coefficient (γ) is always observed for smaller spacer length. Among all the spacers, alkenyl showed the highest and alkyl showed the lowest transmission power. The study recommends the use of short chains of CC double, CC triple or a combination of both as spacers for the effective transmission of substituent effect to the reaction center.


Journal Details

This article was published in the following journal.

Name: Chemphyschem : a European journal of chemical physics and physical chemistry
ISSN: 1439-7641


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