为了更好地理解硫醚配位在铜-O 2化学中的作用,四齿 N 3 S 配体 L ASM(2-(甲硫基)- N , N -双((吡啶-2-基)甲基)苯胺)和相关的烷基醚已经研究了配体 L EOE(2-乙氧基-N,N-双((吡啶-2-基)甲基)乙胺)。相应的铜 (I) 配合物 [(L ASM )Cu I ] + ( 1a ) 和 [(L EOE )Cu I ] + ( 3a ) 与相关化合物 [(L ESE)Cu I ] + ( 2a , L ESE = (2-ethylthio- N , N - bis((pyridin-2-yl)methyl)ethanamine). 1a的X射线结构及其溶液电导率揭示了单体分子结构具有在溶液中持续存在的硫醚配位。相反,衍生的 Cu(I)-CO 配合物的 C−O 伸缩频率表明,对于这些配合物,调制的配体臂,无论是芳硫醚、烷基硫醚还是醚,都没有与亚铜离子. CH
为了更好地理解硫醚配位在铜-O 2化学中的作用,四齿 N 3 S 配体 L ASM(2-(甲硫基)- N , N -双((吡啶-2-基)甲基)苯胺)和相关的烷基醚已经研究了配体 L EOE(2-乙氧基-N,N-双((吡啶-2-基)甲基)乙胺)。相应的铜 (I) 配合物 [(L ASM )Cu I ] + ( 1a ) 和 [(L EOE )Cu I ] + ( 3a ) 与相关化合物 [(L ESE)Cu I ] + ( 2a , L ESE = (2-ethylthio- N , N - bis((pyridin-2-yl)methyl)ethanamine). 1a的X射线结构及其溶液电导率揭示了单体分子结构具有在溶液中持续存在的硫醚配位。相反,衍生的 Cu(I)-CO 配合物的 C−O 伸缩频率表明,对于这些配合物,调制的配体臂,无论是芳硫醚、烷基硫醚还是醚,都没有与亚铜离子. CH
Ligand Modifications Produce Two‐Step Magnetic Switching in a Cobalt(dioxolene) Complex
作者:Khadanand KC、Toby Woods、Lisa Olshansky
DOI:10.1002/anie.202311790
日期:2023.11.6
Solution and solid-state measurements provide support for the first example of two-step magnetic switching in a mononuclear monodioxolene cobaltcomplex. Employing a dynamic ligand scaffold may be the key to stabilizing the rare lowspin Co(II) intermediate state and traversing both valence tautomeric and spin crossover transitions.
Herein is disclosed a bioinspired approach in which triggered conformational changes are used to control electron transfer (ET) events. Photo-induced conformational rearrangements of a ligand are translated into changes in the coordination geometry and environment about a bound metal ion. Taking advantage of the differential coordination properties of CuIand CuII, these dynamics facilitate intramolecular ET from CuIto the ligand to create a CS state. The synthesis and photophysical characterization of CuCl(dpaaR) (dpaa = dipicolylaminoacetophenone, with R = H and OMe) is presented. These ligands incorporate a fluorophore into their framework that gives rise to a twisted intramolecular charge transfer (TICT) excited state. Excited state ligand twisting provides a tetragonal coordination geometry capable of capturing CuIIin the CS state when an internalortho-OMe binding site is present (as in dpaaOMe).
本文公开了一种生物启发方法,利用触发的构象变化来控制电子转移(ET)事件。配体的光诱导构象重排被转化为结合金属离子的配位几何和环境的变化。利用 CuI 和 CuII 的不同配位特性,这些动态变化促进了从 CuI 到配体的分子内电子转移,从而形成 CS 状态。本文介绍了 CuCl(dpaaR)(dpaa = 二icolaminoacetophenone,R = H 和 OMe)的合成和光物理特性。这些配体在其框架中加入了一种荧光体,从而产生了分子内电荷转移(TICT)扭曲激发态。激发态配体扭转提供了一个四方配位几何结构,当存在一个内部正-OMe 结合位点(如 dpaaOMe)时,它能够捕获 CS 态的 CuII。
Conformational dynamicity in a copper(<scp>ii</scp>) coordination complex
作者:Paul J. Griffin、Matthew J. Dake、Alesandro D. Remolina、Lisa Olshansky
DOI:10.1039/d3dt01213a
日期:——
geometries of copper coordination complexes are intricately related to their electron transfer capabilities, but the role of dynamics in these processes are not fully understood. We have previously reported CuCl(dpaOMe), a complex exhibiting conformational fluxionality in its CuI state and rigidity upon oxidation to CuII. Here, we report the synthesis and characterization of [CuCl(dpaSMe)]+/0, a complex exhibiting
铜配位化合物的几何形状与其电子转移能力有着复杂的关系,但动力学在这些过程中的作用尚未完全了解。我们之前报道过 CuCl(dpa OMe ),这是一种在 Cu I状态下表现出构象流动性并在氧化为 Cu II时表现出刚性的复合物。在这里,我们报告了 [CuCl(dpa SMe )] +/0的合成和表征,这是一种在 Cu I态下表现出相对刚性的络合物,在氧化为 Cu II时表现出结构动力学。[CuCl(dpa SMe )] +的动力学特征通过X 射线衍射、循环伏安法和 EPR 光谱,观察到三角双锥和方锥几何形状之间随温度变化的相互转换。将这些固态和溶液态表征数据耦合起来可以分配所涉及的配位几何形状。讨论了影响这些动力学的因素及其对电子转移的潜在影响。
Sulfur Donor Atom Effects on Copper(I)/O<sub>2</sub> Chemistry with Thioanisole Containing Tetradentate N<sub>3</sub>S Ligand Leading to μ-1,2-Peroxo-Dicopper(II) Species
作者:Yunho Lee、Dong-Heon Lee、Ga Young Park、Heather R. Lucas、Amy A. Narducci Sarjeant、Matthew T. Kieber-Emmons、Michael A. Vance、Ashley E. Milligan、Edward I. Solomon、Kenneth D. Karlin
DOI:10.1021/ic101041m
日期:2010.10.4
380 nm, ε ∼ 10,000 M−1 cm−1). This result provides further support for the sulfur influence in 1bP and 2bP, in particular coordination of the sulfur to the Cu. Thermal decomposition of 1bP is accompanied by ligand sulfoxidation. The structure of [(LEOE)CuII(Cl)}2]+ (3c) generated from the reductive dehalogenation of organic chlorides suggests that the ether moiety is weakly bound to the cupric ion
为了更好地理解硫醚配位在铜-O 2化学中的作用,四齿 N 3 S 配体 L ASM(2-(甲硫基)- N , N -双((吡啶-2-基)甲基)苯胺)和相关的烷基醚已经研究了配体 L EOE(2-乙氧基-N,N-双((吡啶-2-基)甲基)乙胺)。相应的铜 (I) 配合物 [(L ASM )Cu I ] + ( 1a ) 和 [(L EOE )Cu I ] + ( 3a ) 与相关化合物 [(L ESE)Cu I ] + ( 2a , L ESE = (2-ethylthio- N , N - bis((pyridin-2-yl)methyl)ethanamine). 1a的X射线结构及其溶液电导率揭示了单体分子结构具有在溶液中持续存在的硫醚配位。相反,衍生的 Cu(I)-CO 配合物的 C−O 伸缩频率表明,对于这些配合物,调制的配体臂,无论是芳硫醚、烷基硫醚还是醚,都没有与亚铜离子. CH