Comprehensive Modeling of Acetone Clusters: QTAIM Analysis and QCE Study

In molecular research, comprehending the microscopic source of the macroscopic characteristics of polar aprotic solvents continues to be a significant difficulty. In order to bridge the gap between cluster-scale interactions and liquid acetone properties, we present a thorough quantum-chemical and statistical modeling of neutral acetone clusters in this work. The ABCluster algorithm was used to thoroughly explore the potential energy surface. High-level density functional theory calculations at the MN12SX-D3/def2-TZVP level were then performed, benchmarked against DLPNO-CCSD(T)/CBS reference energies. A thorough Quantum Theory of Atoms in Molecules (QTAIM) analysis of the nature and hierarchy of intermolecular interactions revealed a cooperative network dominated by dipole-dipole O⋯C and O⋯O interactions, supplemented by numerous weak C-H⋯O, H⋯C, and H⋯H dispersive contacts. The application of the QCE theory predicts a distribution dominated by trimers at low temperatures (T-1) being just 5 cm-1 from the experimental value (1715 cm-1). The thermodynamic properties and infrared spectrum of liquid acetone predicted by QCE show excellent agreement with experimental data, thus validating the integrated DFT-QTAIM-QCE approach. This work provides the first complete QCE characterization of pure liquid acetone, demonstrating that its macroscopic properties emerge from a dynamic equilibrium of small, weakly-bound clusters rather than extended hydrogen-bonded networks, and establishes a validated computational framework for predicting liquid-phase properties from ab initio cluster data.