Lattice and Valence Electronic Structures of Crystalline Octahedral Molybdenum Halide Clusters-Based Compounds, Cs2[Mo6X14] (X = Cl, Br, I), Studied by Density Functional Theory Calculations

Norio Saito (1) , Stéphane Cordier (2) , Pierric Lemoine (2) , Takeo Ohsawa (1) , Yoshiki Wada (1) , Fabien Grasset (3, 1) , Jeffrey S. Cross , Naoki Ohashi (1)

1 NIMS - National Institute for Materials Science
2 ISCR - Institut des Sciences Chimiques de Rennes
3 LINK - Laboratory for Innovative Key Materials and Structures

The electronic and crystal structures of Cs2[Mo6X14] (X = Cl, Br, I) cluster-based compounds were investigated by density functional theory (DFT) simulations and experimental methods such as powder X-ray diffraction, ultraviolet-visible spectroscopy, and X-ray photoemission spectroscopy (XPS). The experimentally determined lattice parameters were in good agreement with theoretically optimized ones, indicating the usefulness of DFT calculations for the structural investigation of these clusters. The calculated band gaps of these compounds reproduced those experimentally determined by UV-vis reflectance within an error of a few tenths of an eV. Core-level XPS and effective charge analyses indicated bonding states of the halogens changed according to their sites. The XPS valence spectra were fairly well reproduced by simulations based on the projected electron density of states weighted with cross sections of Al Kα, suggesting that DFT calculations can predict the electronic properties of metal-cluster-based crystals with good accuracy.

Domains: Chemical Sciences

Norio Saito, Stéphane Cordier, Pierric Lemoine, Takeo Ohsawa, Yoshiki Wada, et al.. Lattice and Valence Electronic Structures of Crystalline Octahedral Molybdenum Halide Clusters-Based Compounds, Cs2[Mo6X14] (X = Cl, Br, I), Studied by Density Functional Theory Calculations. Inorganic Chemistry, 2017, 56 (11), pp.6234-6243. ⟨10.1021/acs.inorgchem.7b00265⟩. ⟨hal-01544244⟩