For the uranyl UO₂²⁺(VI) luminescence, the quenching constants (K_q: mM⁻¹) of various σ–donors and π–donors, which have been shown to form electron-donor–acceptor (EDA) complexes with UO₂²⁺, were found directly related to the ionization energies (IE: eV) of the electron donors, such that the common logarithm logK_q = –0.0932(IE) + 1.671 (R² = 0.945). The relationship has revealed an inner-sphere mechanism for the quenching resulting from the charge-transfer (a single-electron transfer) from the HOMO of the quenching substance (Q) to a SOMO of the excited state (UO₂²⁺)* that takes place in an EDA [Q, (UO₂²⁺)*] complex. For some weak electron donors which do not form EDA complexes with UO₂²⁺, their K_q values for the quenching of UO₂²⁺ luminescence were found significantly much smaller than expected from the logK_q versus IE relationship established for the inner-sphere charge-transfer quenching. The observations have indicated an outer-sphere charge-transfer quenching mechanism possibly resulting from the simple collision between the quenching substance and UO₂²⁺ without the formation of an EDA complex between them. In the presence of tertiary butyl alcohol (^tBuOH) at 0 – 0.015 M (15 mM), the intensity (I) of the emission of UO₂²⁺ (0.01 M) at 508 nm (with Ex = 340 nm) in acetone was found to increase linearly as a function of the ^tBuOH millimolar concentration (mM) (I = 34.2[^tBuOH] + 1802, R² = 0.992). Kinetic analysis has revealed an electronic energy transfer from the excited state of ^tBuOH (A*), identified by luminescence spectroscopy, to the ground state of UO₂²⁺ (U) to promote it to the excited state (U*) (A* + U → A + U*), enhancing the UO₂²⁺ luminescence. The excitation energy transfer is believed to follow a Dexter mechanism, with the overall spin of the energy donor and acceptor conserved, followed by an intersystem crossing ([¹A*, ¹U] → [¹A, ¹U*] → [¹A, ³U*]).

对于铀酰 UO ₂ ²⁺ (VI) 发光，各种 σ-供体和 π-供体的猝灭常数 ( K _q : mM ^-1 ) 已显示与 UO 形成电子-供体-受体 (EDA) 配合物₂ ^{2+与电子供体的电离能 (} IE : eV)直接相关，因此常用对数 log K _q  = –0.0932( IE ) + 1.671 (R ²  = 0.945)。_{该关系揭示了由猝灭物质 (Q) 的 HOMO 到激发态的 SOMO (UO 2} ) 的电荷转移（单电子转移）导致猝灭的内球机制²⁺ )* 发生在 EDA [Q, (UO ₂ ²⁺ )*] 复合体中。对于一些不与 UO ₂ ²⁺形成 EDA 复合物的弱电子供体，发现它们的用于猝灭 UO ₂ ^2+发光的K _q值明显小于为内部建立的 log K _q与IE关系所预期的值。球电荷转移猝灭。观察结果表明，外球电荷转移猝灭机制可能是猝灭物质与 UO ₂ ^{2+之间的简单碰撞引起的。}它们之间没有形成 EDA 复合体。在0 – 0.015 M (15 mM)的叔丁醇 ( ^t _{BuOH) 存在下，丙酮中 UO 2} ²⁺ (0.01 M) 在 508 nm（Ex = 340 nm）的发射强度 (I)发现作为^t BuOH 毫摩尔浓度 (mM)的函数线性增加(I = 34.2[ ^t BuOH] + 1802, R ²  = 0.992)。动力学分析表明电子能量从^t BuOH (A*) 的激发态（通过发光光谱识别）转移到 UO ₂ ²⁺ (U) 的基态以促进其进入激发态 (U*) (A * + U → A + U*)，增强 UO ₂ ²⁺发光。激发能量转移被认为遵循德克斯特机制，能量供体和受体的整体自旋守恒，然后是系统间交叉（[ ¹ A*, ¹ U] → [ ¹ A, ¹ U*] → [ ¹ A, ³ U*])。