Reductive dehalogenation of an aryl halide (Ar-X) subsequent coupling with bis(pinacolato)diboron (B₂pin${}_2)$ to form an arylboronate (Ar-Bpin) by the photo-excited B${}_{12}$ complex of the Co${}^{\mathrm{\text{I}}}$ oxidation state with an iridium photosensitizer (PS), [Ir(dtbbpy)(ppy)₂]PF₆, under anaerobic conditions was reported. The robust B${}_{12}$ complex and iridium PS provided the highest turnover numbers of over 3,800 for the borylation reaction at room temperature. The Co^I state of the B${}_{12}$ complex was formed via the reductive quenching pathway of [Ir(dtbbpy)(ppy)₂]PF₆ by visible light irradiation in the presence of $N$, $N$-diisopropylethylamine ($i$-Pr₂NEt) as a sacrificial electron donor (SED), which was confirmed by a photoluminescence lifetime analysis. A picosecond time-resolved spectroscopic analysis showed that the electron transfer from the excited Co${}^{\mathrm{\text{I}}}$ state of the B${}_{12}$ complex (${}^{\ast }$Co${}^{\mathrm{\text{I}}})$ to the Ar-X occurred in the order of the rate constants for electron transfer ($k_{\mathrm{\text{eT}}}^{″})$, Ar-I $>$ Ar-Br $>$ Ar-Cl. Based on the mechanistic studies, dual excitation of PS and the B${}_{12}$ complex is involved in the catalytic reaction and single electron transfer (SET) from ${}^{\ast }$Co${}^{\mathrm{\text{I}}}$ to Ar-X could provide the aryl radical by fragmentation of the Ar-X radical anion. The aryl radical should react with the radical trapping reagent, B₂pin₂, to form the Ar-Bpin product.

芳基卤化物 (Ar-X) 的还原脱卤反应，随后与双(频哪醇)二硼 (B ₂ pin)偶联${}_2）$通过光激发B形成芳基硼酸酯(Ar-Bpin)${}_{12}$公司综合体${}^{\mathrm{\text{我}}}$报道了在厌氧条件下使用铱光敏剂（PS）[Ir(dtbbpy)(ppy) ₂ ]PF _{6的氧化态。}稳健的B${}_{12}$络合物和铱 PS 在室温下的硼化反应中提供了超过 3,800 的最高转换数。B 的Co ^I状态${}_{12}$在可见光照射下，通过 [Ir(dtbbpy)(ppy) ₂ ]PF ₆的还原猝灭途径形成络合物$氮$,$氮$-二异丙基乙胺（$我$-Pr ₂ NEt）作为牺牲电子供体（SED），这通过光致发光寿命分析得到证实。皮秒时间分辨光谱分析表明，电子从激发的 Co 转移${}^{\mathrm{\text{我}}}$B的状态${}_{12}$复杂的 （${}^{*}$钴${}^{\mathrm{\text{我}}}）$到 Ar-X 的发生按照电子转移速率常数的顺序（$k_{\mathrm{\text{ET}}}^{”}）$, Ar-I$>$溴化氩$>$Ar-Cl。基于机理研究，PS和B的双重激励${}_{12}$配合物参与催化反应和单电子转移（SET）${}^{*}$钴${}^{\mathrm{\text{我}}}$与Ar-X的连接可以通过Ar-X自由基阴离子的断裂提供芳基自由基。芳基自由基应与自由基捕获剂 B ₂ pin ₂反应，形成 Ar-Bpin 产物。