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Metal sulfur dioxide complexes are complexes that contain sulfur dioxide, SO2, bonded to a transition metal. Such compounds are common but are mainly of theoretical interest. Historically, the study of these compounds has provided insights into the mechanisms of migratory insertion reactions in organometallic chemistry. ==Bonding modes== Sulfur dioxide forms complexes with many transition metals. For the most stable complex the metal is in oxidation state 0 or +1.〔 In most cases SO2 binds in monodentate fashion, attaching to the metal through sulfur. Such complexes are further subdivided according to the planarity or pyramidalization at sulfur. The various bonding modes are: *η1-SO2, planar (meaning that the MSO2 subunit forms a plane). In such complexes, SO2 is classified as a 2e donor complemented by pi-back bonding into the empty pz orbital localized on sulfur. *η1-SO2, pyramidal (meaning that the MSO2 subunit is pyramidal at sulfur). In such complexes, SO2 is classified as a pure Lewis acid. The structure is similar to that for conventional Lewis base adducts of SO2. *η2-SO2. Both S and one O centre are attached to the metal. The MSO2 subunit is pyramidal at sulfur. This bonding mode is more common for early metals, which are typically strongly pi-donating. *η1-SO2, O-bonded. In such cases, SO2 attaches to a metal via one of its two oxygen centres. Such complexes are prevalent for hard metal cations such as Na+ and Al3+. In these compounds the M-O interaction is usually weak. More exotic bonding modes are known for clusters. : 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Metal sulfur dioxide complex」の詳細全文を読む スポンサード リンク
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