Abstract
Context
To comprehend the microscopic property alterations within the ConMoS cluster (n=1–5), this study investigates its internal interactions, electronic characteristics, and orbital correlations employing density functional theory. Structural optimization and theoretical analysis of the cluster are conducted using the Gaussian09 software package, considering various spin multiplicities and employing the B3LYP/def2tzvp quantum chemical method as the computational standard. The outcomes reveal the optimization of the cluster, resulting in 21 stable configurations while continually acquiring energy from the external environment. Analysis of the interaction region indicator functions, the independent gradient model based on Hirshfeld partition, the localized orbital indicator functions, and the electron localization function reveals a trend toward chemical bonding interactions within the interatomic interaction regions. Moreover, the interatomic forces exhibit a high likelihood of engaging in covalent bonding interactions. Both Co and Mo atoms display greater electron delocalization, facilitating the exchange of electrons with the external environment. The paper discuss electron space range, hardness and softness, polarizability, dipole moment, Mulliken population analysis, density of states, HOMO-LUMO diagram, and UV-Vis spectra. Configuration 5a exhibits the broadest electron delocalization and the highest reactivity. It maintains structural stability in external conditions and displays the most polarized molecules. Metal atoms in this cluster exhibit superior mobility compared to non-metal atoms. We elucidate the electron density aggregation region within the cluster. Configuration 1a demonstrates the highest correlation with molar absorption coefficient for its peak. Analyzing the HOMO and LUMO orbital delocalization index and center-of-mass distances revealed that the front orbits of configuration 5a exhibited a broad distribution in space and the minimum center-of-mass distance.
Methods
This study presents a theoretical investigation of Co-Mo-S clusters employing density functional theory (DFT). DFT is a prevalent method for exploring the electronic structure and characteristics of atoms, molecules, and solids. The paper examines cluster attributes encompassing interatomic interactions, electronic properties, and frontier orbitals. Gaussian09 software is employed for optimizing cluster structures, while the analysis is augmented using Multiwfn wave function analysis software. By harnessing these theoretical and computational tools, it aims to delve deeper into cluster properties, yielding valuable insights.
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Acknowledgements
Thanks to the National Natural Science Foundation of China and National Innovation and Entrepreneurship Training Program for College Students.
Funding
This work was supported by the Key Program of the National Natural Science Foundation of China (Grant No.51634004); National Innovation and Entrepreneurship Training Program for College Students (Grant No.: 202210146008, 202210146011, 202210146009).
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Zhi-yao Wang: writing, data management, methodology, and article proofreading. Zhi-gang Fang: conceptualization and project management. Li-e Liu: article proofreading, verification, and methodology. Ting-hui Wu: article proofreading.
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Wang, Zy., Fang, Zg., Liu, Le. et al. Density functional theory studies on properties of cluster ConMoS (n=1 ~ 5): interatomic interactions, electronic properties, frontier orbitals. J Mol Model 29, 326 (2023). https://doi.org/10.1007/s00894-023-05730-1
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DOI: https://doi.org/10.1007/s00894-023-05730-1