Metal–Metal Bridging Using the DPPP Dye System: Electronic Configurations within Multiple Redox Series
作者:Arijit Singha Hazari、Abhishek Mandal、Katharina Beyer、Alexa Paretzki、Wolfgang Kaim、Goutam Kumar Lahiri
DOI:10.1021/acs.inorgchem.6b03112
日期:2017.3.6
corresponding precursors, isolated as rac diastereomers. Oxidation was observed to occur mainly at the bridging ligand (DPPP2– → DPPP•–), whereas the site of reduction (DPPP, Ru, or L) depends on effects from the ancillary ligands L. The metal coordination of a derivative of the pigment forming 2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione (DPP) dyes and the analysis of corresponding multistep redox series add to
氧化还原系列[L n Ru(μ-DPPP)RuL n ] k,H 2 DPPP = 2,5-二氢-3,6-二-2-吡啶基吡咯并(3,4- c)吡咯-1,4-二酮和通过伏安法(CV,DPV),EPR和UV-vis-NIR光谱电化学法研究了L = 2,4-戊二酮(acac –),2,2'-联吡啶(bpy)和2-苯基偶氮吡啶(pap) ,由TD-DFT计算支持。晶体结构分析和1 1 H NMR表明氧化态[(ACAC)2的Ru III(μ-DPPP 2- )的Ru III(ACAC)2 ]和[(联吡啶)2的Ru II(μ-DPPP 2- )的RuII(bpy)2 ] 2+为相应的前体,被分离为rac非对映体。观察到氧化主要发生在桥连配体(DPPP 2 →DPPP •)上,而还原位点(DPPP,Ru或L)取决于辅助配体L的作用。形成2,5-二氢-吡咯并(3,4- c)吡咯-1,4-二酮(DPP)染料