• 沒有找到結果。

-(μ-peroxo)-MnIII (intermediate-A)的生成,中間體 O-O 鍵的斷裂形成高價氧基錳 氧化另一當量 Mn(II)形成氧橋接產物。雖然過程中沒有觀測到中間體的生成,

與穩定高價錳錯合物。被氧化劑 3 氧化生成的 4 則觀測到一個可逆的氧化還原

峰指出是 MnIII-O-MnIV,這展現出高電子豐富度及未定域性的配位基TMSPS33

參與穩定高價的可能性。而 5 則呈現出在更低的電位有一個可逆的 MnIII/MnII

化還原峰,這突顯了 5 更難的進行相關還原反應,例如氫原子轉移。

探討氧氣由 1 與 2 分別在是否存在溶劑的環境的活化,前述提出其低電位

容易被氧化劑氧化。存在溶劑的環境能幫助二價錳錯合物離子的移動,使得 1

氧化生成的 3 容易地與游離在四周的二價錳錯合物離子進行反應並生成 4;反

之不存在溶劑幫助的固態氧化,就純粹地被氧化至 3。另外 1 在室溫形成能被

定義的兩種衍生物,推測是因為溶劑參與形成單核錳(II)化合物而致。在此實驗

觀測指出氧氣到過氧的兩電子還原的媒介是由一到兩個二價錳離子,而這必然

促使氧氣四電子的還原。

這項研究中得知了雙核 1 在溶液中活化氧氣有利於形成氧橋接的 4 和處理

的 O 2與單核 2 的溶液和固態生成 peroxo-3。我們相信先前提出的[MnI(CO)3

(P(-C6H3-3-SiMe3)2(C6H3-3-SiMe3-2-SH))]與氧氣接觸後形成溶劑共存的單核[MnII

(-TMSPS3)]中間體的產生,其進一步活化的二當量氧氣形成 peroxo-3。

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