Systematic Approach to Negative Fukui Functions: Its Association with Nitro Groups in Aromatic Systems

Area of Science:

• Quantum Chemistry
• Theoretical Chemistry
• Chemical Reactivity

Background:

• Fukui functions relate to electron densities, aiding reactivity predictions.
• Negative Fukui functions lack clear interpretation within electron density models.
• Existing literature suggests negative values correlate with wave function nodes.

Purpose of the Study:

• Investigate the phenomenon of negative Fukui functions.
• Relate negative Fukui functions to specific chemical moieties and their electronic properties.
• Understand and predict chemical reactivity associated with negative Fukui functions.

Main Methods:

• Computational analysis of Fukui functions.
• Correlation of negative Fukui function values with the presence and position of nitro groups.
• Examination of the influence of nitro group orientation relative to aromatic systems.

Main Results:

• Negative Fukui function values are demonstrably linked to the presence of nitro groups.
• Nitro groups, as electron-withdrawing moieties, exhibit high highest occupied molecular orbital (HOMO) electron densities near zero.
• The orientation of the nitro group significantly influences the observed Fukui function values.

Conclusions:

• Negative Fukui functions can be understood in the context of nitro-substituted aromatic systems.
• This research provides a framework for predicting chemical reactivity based on negative Fukui function values.
• The findings offer insights into the electronic behavior of electron-withdrawing groups in aromatic systems.