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Development of Polynuclear Molecular Wires Containing Ruthenium(II) Terpyridine Complexes

机译:含钌(II)联吡啶配合物的多核分子线的研制

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The preparations of multinuclear supramolecules assembled from 1',1'"-bis(terpyridyl)-biferrocene redox-active subunits with Ru~(2+) metal centers are described.The electrochemical measurements of the series of Ru~(2+)-coordinated 1',1'"-bis(terpyridyl)biferrocene complexes are dominated by the Ru~(2+)/Ru~(3+) redox couple (E_(1/2) at approx1.35 V),Fe~(2+)/Fe~(3+) redox couples (E_(1/2) from approx0.4 to approx0.9 V),and terpy/terpy~-/terpy~(2-) redox couples (E_(1/2) at approx-1.2 and approx -1.4 V).The appreciable variations detected in the Fe~(2+)/Fe~(3+) oxidation potentials indicate that there is an interaction between the spacer and the Ru~(2+) metal centers.On the coordination of Ru~(2+) metal centers with 1',1'"-bis(terpyridyl)biferrocene,there is a rise to a red-shifted and more intense ~1[(d(pi)_(Fe))~6]->~1[d(pi)_(Fe)]~5(pi_(terpy)~(Ru))~1] transition in the visible region.The observed red-shifted absorption from approx510 nm in monomeric [Ru(terpy)_2]~(2+) and [Ru(terpy)(fcterpy)]~(2+) complexes to approx570 nm in polynuclear Ru~(2+) 1',1'"-bis(terpyridyl)biferrocene complexes reveals that there is a qualitative electronic coupling within the array.The coordination of Ru~(2+) transition-metal centers lowers the energy of the pi_(terpy) orbitals,giving a more red-shifted transition.
机译:描述了由具有Ru〜(2+)金属中心的1',1'“-双(叔吡啶基)-二茂铁氧化还原活性亚基组装而成的多核超分子的制备。Ru〜(2 +)-系列的电化学测量配位的1',1'“-双(吡啶基)双茂铁络合物主要由Ru〜(2 +)/ Ru〜(3+)氧化还原对(E_(1/2)在大约1.35 V),Fe〜( 2 +)/ Fe〜(3+)氧化还原对(E_(1/2)从约0.4至约0.9 V),以及terpy / terpy〜-/ terpy〜(2-)氧化还原对(E_(1 / 2)在大约1.2 V和大约-1.4 V时).Fe〜(2 +)/ Fe〜(3+)氧化电势中检测到的明显变化表明间隔基与Ru〜(2+ )。在Ru〜(2+)金属中心与1',1'“-双(叔吡啶基)二茂铁配位基的配位上,出现红移且强度更大的〜1 [(d(pi)) _(Fe))〜6]->〜1 [d(pi)_(Fe)]〜5(pi_(terpy)〜(Ru))〜1]跃迁。 [Ru(terpy)_2]〜(2+)和[Ru(terpy)(fc多核Ru〜(2+)1',1'“-双(吡啶基)二茂铁配合物中的terpy)]〜(2+)络合物约570 nm,表明该阵列内存在定性电子偶联.Ru〜 (2+)过渡金属中心降低pi_(terpy)轨道的能量,从而产生更多的红移过渡。

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