Synthesis, Structure, and Oxidative Reactivity of a Class of Thiolate‐Bridged Dichromium Complexes Featuring Antiferromagnetic Coupling Interactions
作者:Nianmin Wei、Dawei Yang、Yixin Zhang、Baomin Wang、Jingping Qu
DOI:10.1002/ejic.202001050
日期:2021.3.12
complexes with Cp* (Cp*=η5‐C5Me5) as auxiliary ligands were designed and synthesized through the salt metathesis, which all contain two six‐coordinate chromium centers in the formal valence of +3. These complexes are all paramagnetic species, which are in good agreement with the experimental results that broad and paramagnetically shifted proton resonances appear in the 1H NMR spectra. Furthermore, variable‐temperature
几个硫醇盐桥连络合物二铬再用Cp *(CP * = η 5 -C 5我5)作为辅助配体的设计,并通过盐复分解合成,其中所有含有两个六坐标铬中心中的3的形式价。这些络合物都是顺磁性物质,与在1 H NMR光谱中出现宽顺磁性位移的质子共振的实验结果非常吻合。此外,可变温度固态磁化率研究表明,这些络合物的两个铬中心都在S中= 3/2高自旋状态,具有强反铁磁耦合。这些配合物的反铁磁耦合常数的模拟值直接与X射线晶体学确定的两个Cr III中心的距离有关。此外,在存在脱卤剂AgPF 6的情况下,复合物[Cp * CrCl(μ‐ SR )2 CrClCp *](3,R = Et; 4,R = i Pr)和[Cp * Cr(μ‐ Cl) (μ -set)2 CRCP *] [BPH 4 ](5)含有易于移除氯化物可以实现有机基材,如产后出血的催化氧化3氧气氛下的1,4-环己二烯和1,2-二苯肼。