Sulfur Dioxide Complexes of Main-Group Elements: from SO2(0) to SO2(-) and SO2(2-) upon Coordination to Aluminum and Silicon Difluorides.
2020
The
AlF2(O2S) and SiF2(O2S)
complexes with bidentately coordinated sulfur dioxide ligands were
prepared via the reactions of aluminum and silicon atoms with SO2F2 under UV–vis irradiation in cryogenic
matrixes. The products were identified by infrared spectroscopy as
well as DFT frequency calculations, and nonplanar C2v structures with the SO2 ligand bound to Al/Si via two oxygen atoms were established. In
spite of the similarity in geometric structures, the electronic structures
of AlF2(O2S) and SiF2(O2S) are completely different. The longer S–O bond length and
the lower O–S–O stretching vibrational frequencies of
SiF2(O2S) in comparison to those of AlF2(O2S) indicate that SiF2(O2S) possesses a singlet SO22–-like ligand
while the SO2 ligand is better described as SO2– in AlF2(O2S), which is
further confirmed by bonding and population analysis. Linear correlations
were established between the experimental O–S–O stretching
frequencies and calculated S–O bond lengths of SO2, AlF2(O2S), and SiF2(O2S), suggesting that the S–O bond is gradually activated when
SO2 is coordinated to AlF2 and SiF2.
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