The Molecule Calculator: A web-server for fast quantum mechanics-based estimation of molecular properties

TL;DR

The Molecule Calculator is a web-based tool that allows users to quickly estimate various molecular properties using quantum mechanics, aiding education and research without complex calculations.

Contribution

It introduces an accessible web-server integrating quantum chemistry calculations for rapid molecular property estimation, enhancing educational and research workflows.

Findings

Provides fast estimations of thermodynamic properties

Enables interactive molecule building and property analysis

Supports educational development of chemical intuition

Abstract

A new web-server called The Molecule Calculator (MolCalc) is presented. The entry page is a molecular editor (JSmol) for interactive molecule building. The resulting structure can then be used to estimate molecular properties such as heats of formation and other thermodynamic properties, vibrational frequencies and vibrational modes, and molecular orbitals and orbital energies. These properties are computed using the GAMESS program at either the RHF/STO-3G (orbitals and orbital energies) or PM3 level of theory (all other properties) in a matter of seconds or minutes depending on the size of the molecule. The results, though approximate, can help students develop a "chemical intuition" about how molecular structure affects molecular properties, without performing the underlying calculations by hand, a near impossible task for all but the simplest chemical systems.