What question did this study set out to answer?

This research aims to analyze the structural preferences and stability of Type B heteropentalene mesomeric betaines and their azacyclooctatetraene isomers.

February 14, 2026Open Access

A Density Functional Theory Study of the Structural Preferences of Type B Heteropentalene Mesomeric Betaines and Their Non‐Aromatic Azacyclooctatetraene Isomers

Key Points

This research aims to analyze the structural preferences and stability of Type B heteropentalene mesomeric betaines and their azacyclooctatetraene isomers.
Utilized density functional theory (DFT) for computational analysis
Examined the thermodynamic stabilities of heteropentalene betaines and azacyclooctatetraenes
Analyzed HOMO/LUMO energy differences to assess electronic properties
Most pairs of isomers show unlikely interconversion
HOMO/LUMO energy differences in HMBs suggest potential in reducing band gaps of conducting polymers

Abstract

ABSTRACT Density Functional Theory (DFT) has been used to explore the relative thermodynamic stabilities of a series of Type B heteropentalene mesomeric betaines (HMBs) 1a‐c and their corresponding azacyclooctatetraene isomers 2a‐c . The results of these calculations suggest that (a) the interconversion of most pairs of isomers is unlikely to occur and (b) the HOMO/LUMO energy difference in the HMBs suggests they might have a role in reducing the band gaps of known Type B HMB conducting polymers.

A Density Functional Theory Study of the Structural Preferences of Type B Heteropentalene Mesomeric Betaines and Their Non‐Aromatic Azacyclooctatetraene Isomers

Key Points

Abstract

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