SO²⁺: Closing a Gap in Sulfur Oxide Chemistry

Abstract

Just SO! The recently published synthesis of the SO dication is summarized along with the connection to the dications [C Me ] and [Cp* Fe ]. The molecular structure of the cation [C Me SO ] is shown in the figure (gray C, red O, yellow S).

Side-On OMoF2(η2-SO) and OWF2(η2-SO) Complexes Featuring Peroxo-Like Sulfur Monoxide Ligand

“…The 1007.7, 755.3, 686.3, and 669.9 cm −1 absorptions exhibit identical behaviors upon sample annealing and UV−vis irradiation, indicating they should belong to different vibrational modes of the same product. The 1007.7 cm −1 band shifted to 958.9 cm −1 upon 18 O substitution with an 16 O/ 18 O frequency ratio of 1.0509, suggesting that it should be a terminal Mo−O stretch in comparison to the values of the same mode of OMoF 2 (1007.6 cm −1 and 1.0505). 40 This assignment is further confirmed by the zero shift when the 34 SO 2 F 2 sample was used.…”

“…14 The side-on (η 2 -SO) coordination fashion was corroborated for the group 4 and 5 metal complexes, 15,16 and the group 5 metal complexes can be considered as (OMF 2 ) + (SO) − based on the S−O stretching vibrational frequency and bond length. 16 The existence of SO − in the SO complexes of group 5 metals raises the question of whether SO can be further reduced upon coordination to transition metals with richer electrons, since O 2 , which is isoelectronic to SO, 6,17,18 undergoes stepwise activation to form superoxo and peroxo complexes upon coordination to metal centers. 19−21 There has been a comparison focusing on the Fe−SO 2− and Fe−O 2 2− intermediates from the theoretical point of view, 22 but experimental evidence that clearly demonstrates the existence of a peroxo-like sulfur monoxide (SO 2− ) complex of transition metal is limited.…”

Reactivity of Small Oxoacids of Sulfur

“…Sulfur monoxide and its dimer S 2 O 2 are of great interest to astrophysics since they are abundant in the Venusian atmosphere [14]. SO is isovalence-electronic to O 2 with a triplet ground state and features a S-O bond length of 1.481 Å indicating double-bond character [80]. Sulfur monoxide is formed from SO 2 under microwave discharge and by oxidation of elemental sulfur [80,81].…”

“…SO is isovalence-electronic to O 2 with a triplet ground state and features a S-O bond length of 1.481 Å indicating double-bond character [80]. Sulfur monoxide is formed from SO 2 under microwave discharge and by oxidation of elemental sulfur [80,81]. Both SO and S 2 O 2 are unstable—disproportionation of SO leads to the formation of S and SO 2 [80].…”

“…Sulfur monoxide is formed from SO 2 under microwave discharge and by oxidation of elemental sulfur [80,81]. Both SO and S 2 O 2 are unstable—disproportionation of SO leads to the formation of S and SO 2 [80]. Two 3 SO produce two S 2 O 2 isomers OSSO or SOSO, which both have a cis and a trans conformers.…”