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Structural and Electronic Investigation of Tetrachalcogenidomolybdate Dianions
Author(s) -
Chang Alison S.,
Pintauer Tomislav,
Basu Partha,
Eckenhoff William T.
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800506
Subject(s) - bond length , delocalized electron , crystallography , molecular geometry , chalcogenide , density functional theory , crystal structure , crystal (programming language) , chemistry , electronic structure , materials science , ion , diffraction , homo/lumo , computational chemistry , molecule , physics , optics , computer science , organic chemistry , programming language
Four compounds with tetrachalcogenidomolybdate dianions were examined under identical conditions by single crystal X‐ray diffraction and density functional theory (DFT) calculations. Structural comparisons of bond lengths and angles were made looking at effects of counter‐cations and type of chalcogenide (S or O). Ultimately, bond lengths and angles were found to be fairly regular for each anion and in good agreement with computational results, with exceptions likely stemming from close contacts in the crystal packing. A trend of increasing bond lengths was observed with increasing cation size. The most notable structural deviation occurred in [MoO 2 S 2 ] 2− , where the theoretical structure has a smaller O−Mo‐O angle and a larger S−Mo‐S angle, which was opposite in the crystal structure. This is likely attributed to N−H—S and N−H—O interactions. Both experimental and computational results suggest that uniform charge delocalization in all four structures. The HOMO‐LUMO gap increases significantly with increasing number of oxygen atoms and electronic transitions were determined to be all ligand to metal charge transfer (LMCT).