Establishing a new QM/MM design principle based on electronic-state responses

Researchers have developed a new design principle for QM/MM simulations that automatically determines the quantum-mechanical region based on electronic-state responses like charge redistribution and molecular orbital energy changes. This approach eliminates the subjective boundary definition that has plagued conventional QM/MM methods, improving reproducibility and predictive reliability. The principle was validated across diverse systems including inorganic porous materials and biomolecular systems, maintaining chemical accuracy while being compatible with various quantum-chemical methods like DFT and ab initio approaches. Future integration with machine learning could enable automated design of complex materials and reaction systems.