Photoexcitation of a manganese(IV)‐oxo‐scandium nitrate complex ([(Bn‐TPEN)Mn^IV(O)]²⁺−Sc(NO₃)₃) in a solvent mixture of trifluoroethanol and acetonitrile (v/v=1 : 1) resulted in generation of the long‐lived photoexcited state, which is detected by nanosecond laser transient absorption measurements. The transient absorption maximum (λ_max) of the ²E excited state of [(Bn‐TPEN)Mn^IV(O)]²⁺−Sc(NO₃)₃ is observed at 620 nm with lifetimes of 7.1 μs. The λ_max value is blue‐shifted and the lifetime becomes longer as compared with the previously reported values of λ_max (640 nm) and lifetime (6.4 μs) of the ²E excited state of the 1 : 2 complex between [(Bn‐TPEN)Mn^IV(O)]²⁺ and Sc(OTf)₃ ([(Bn‐TPEN)Mn^IV(O)]²⁺−(Sc(OTf)₃)₂). The electron‐transfer reactivity of the ²E excited states of [(Bn‐TPEN)Mn^IV(O)]²⁺−Sc(NO₃)₃ was similar to that of [(Bn‐TPEN)Mn^IV(O)]²⁺−(Sc(OTf)₃)₂. The long lifetime and the high reactivity of the ²E excited state of [(Bn‐TPEN)Mn^IV(O)]²⁺−Sc(NO₃)₃ provide an excellent photooxidant for oxidation of compounds, which would otherwise be impossible to be oxidized.

中文翻译：

---

锰（IV）-氧-氧化Scan硝酸盐络合物的长寿命光激发态的产生和电子转移反应性

在三氟乙醇和乙腈（v / v = 1 ）的溶剂混合物中光激发锰（IV）-氧-硝酸scan络合物（[（Bn-TPEN）Mn ^IV（O）] ²⁺ -Sc（NO ₃）₃）：1）产生了长寿命的光激发态，这可以通过纳秒激光瞬态吸收测量来检测。瞬态吸收最大值（λ_最大的的）² Ë的激发态[（BN-TPEN）的Mn ^IV（O）] ²⁺ -SC（NO ₃）₃，观察到在620nm具有7.1微秒的寿命。该λ_最大值是蓝移和作为与先前报道的值相比较的寿命变长λ_最大的的（640纳米）和寿命（6.4微秒）² Ë 1的激发态：2配合物[（BN-TPEN）的Mn之间^IV（O）] ²⁺和Sc（OTf）₃（[（（Bn-TPEN）Mn ^IV（O）] 2 ⁺ -（Sc（OTf）₃）₂）。所述的电子转移反应² ë激发的状态[（BN-TPEN）的Mn ^IV（O）] ²⁺ -SC（NO ₃）₃是类似于的[（BN-TPEN）的Mn ^IV（O）] ²⁺-（Sc（OTf）₃）₂。[（Bn-TPEN）Mn ^IV（O）] ²⁺ -Sc（NO ₃）₃的² E激发态的长寿命和高反应活性为化合物的氧化提供了极好的光氧化剂，否则该化合物就不可能氧化。被氧化。