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- W2022637585 abstract "Density functional theory has been applied to investigate the monomeric and dimeric dihalides of the heavier alkaline earth metals. Quasirelativistic pseudopotentials and large basis sets with uncontracted d (and f) polarization functions on the metals and correlation-consistent all-electron basis sets on the halogens were utilized. The monomers of SrF2, BaF2, and BaCl2 were found to be genuinely bent, while CaF2 and SrCl2, although also bent, have extremely flat potential energy surfaces and are better described as quasilinear. The dimers of the heavier alkaline earth difluorides and dichlorides, Ca2F4, Ca2Cl4, Sr2F4, Sr2Cl4, Ba2F4, and Ba2Cl4, were investigated in great detail. Six different isomers were calculated for the strontium and barium dihalide dimers. The typical D2h symmetry halogen-bridged structure is the most stable only for the dimers of the lighter dihalides, and it is not a stable structure for the heavier dimers. For these molecules, a triple-bridged C3v symmetry structure is the most stable and even other isomers with pyramidal coordination of the metal were found to be stable, although with higher energy. There appears to be a correlation between the monomer and the dimer structures for alkaline earth dihalides; for the linear halides, the metal tends to have planar, while for the bent ones, pyramidal coordination in their most stable dimer structure. Not only have our calculations extended information on this class of compounds but they have also considerably improved the agreement between the calculated and the available experimental data." @default.
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- W2022637585 date "2000-02-15" @default.
- W2022637585 modified "2023-09-26" @default.
- W2022637585 title "Unusual Dimer Structures of the Heavier Alkaline Earth Dihalides: A Density Functional Study" @default.
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- W2022637585 doi "https://doi.org/10.1021/jp994339n" @default.
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