Syntheses and Properties of Heterobimetallic Ligand-Bridged Ruthenium(II)/Rhenium(I) Complexes and Their Monometallic Congeners
作者:Benjamin J. Coe、Emma C. Fitzgerald、Madeleine Helliwell、Bruce S. Brunschwig、Anthony G. Fitch、James A. Harris、Simon J. Coles、Peter N. Horton、Michael B. Hursthouse
DOI:10.1021/om800105c
日期:2008.6.1
heterobimetallic complexes containing electron-donating trans-RuIICl(pdma)2}+ [pdma = 1,2-phenylenebis(dimethylarsine)] centers linked to electron-deficient fac-ReI(biq)(CO)3}+ (biq = 2,2′-biquinolinyl) units. The bridging units are 4,4′-bipyridyl (4,4′-bpy), E-1,2-bis(4-pyridyl)ethylene (bpe), or 1,4-bis[E-2-(4-pyridyl)ethenyl]benzene (bpvb) ligands. A number of new monometallic precursor complexes have also
我们已经制备了三个新的杂双金属配合物,它们含有给电子反式-Ru II Cl(pdma)2 } + [pdma = 1,2-亚苯基双(二甲基ar)]中心,该中心与电子缺陷的fac- Re I(biq)( CO)3 } +(biq = 2,2'-biquinolinyl)单元。桥接单元为4,4'-联吡啶(4,4'-bpy),E -1,2-双(4-吡啶基)乙烯(bpe)或1,4-双[ E-2-(4-吡啶基)乙烯基]苯(bpvb)配体。主要为了比较,还合成了许多新的单金属前体配合物并进行了充分表征。双金属物质的电子吸收光谱主要由可见的强d(Ru II)→π*(4,4'-bpy / bpe / bpvb)金属-配体电荷转移(MLCT)带和d(Re I)→π*(biq)在近紫外区域的吸收。循环伏安研究显示Ru III / II氧化和基于配体的还原过程,没有证据表明两个金属中心之间存在重要的电子通讯