This article provides a comprehensive overview of the UCA-FUKUI software, its key features, applications, and how to obtain it. What is UCA-FUKUI Software?

Disclaimer: UCA‑FUKUI is an academic software intended for non‑commercial research and educational use. Always obtain the software from official or developer‑provided sources to ensure you have the latest stable version.

Disclaimer: Ensure you are using the latest, authorized version of the software for your research, typically by contacting the developers listed in the original 2014 publication. If you'd like, I can:

A: Use the Wayback Machine (archive.org) to fetch older versions, or email the Civil Engineering department of Fukui Prefectural University directly.

Generate NBO output files for the anionic (N+1 electron, charge -1) and cationic (N-1 electron, charge +1) species using the optimized geometry. The software requires these files as inputs to calculate the condensed Fukui functions. 3. Running UCA-FUKUI the UCA-FUKUI software.

Optimize the molecular system using Gaussian (e.g., using B3LYP/6-311G** Opt).

UCA-FUKUI is commonly distributed through academic channels. To obtain the software, users often need to request it directly from the authors or download it from provided research repositories. Steps to Acquire the Software

UCA-FUKUI implements both the and the frontier molecular orbital (FMO) method for calculating Fukui functions. The finite difference approach requires three single‑point calculations (neutral, cation, anion), while the FMO method uses only the frontier orbital densities from a single calculation on the neutral molecule. The software allows you to perform both approaches and compare the results, giving you confidence in the final assignment of reactive sites. The original paper notes that there is “a high correlation between global parameters, but a weaker correlation between local parameters,” highlighting the importance of having both methods available for cross‑validation.