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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ruthenium(ii) bis(terpyridine) electron transfer complexes with alkynyl-ferrocenyl bridges: Synthesis, structures, and electrochemical and spectroscopic studies
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Ruthenium(ii) bis(terpyridine) electron transfer complexes with alkynyl-ferrocenyl bridges: Synthesis, structures, and electrochemical and spectroscopic studies

机译:带有炔基-二茂铁基桥的钌(ii)双(叔吡啶)电子转移配合物:合成,结构以及电化学和光谱学研究

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摘要

Two novel alkynyl-bridged symmetric bis-tridentate ligands 1,2-bis(1′-[4′-(2,2′:6′,2″-terpyridinyl)] ferrocenyl)ethyne (3a; tpy-Fc-CC-Fc-tpy; Fc = ferrocenyl; tpy = terpyridyl) and 1,4-bis(1′-[4′-(2,2′:6′,2″-terpyridinyl)] ferrocenyl)-1,3-butadiyne (3b; tpy-Fc-CC-CC-Fc-tpy) and their Ru ~(2+) complexes 6a and 6b have been synthesized and characterized by cyclic voltammetry, UV-vis and luminescence spectroscopy, and in the case of 3b by single-crystal X-ray diffraction. Cyclic voltammograms of both compounds, 3a and 3b, display two severely overlapping ferrocene-based oxidative peaks with only one reductive peak. The redox behavior of 6a and 6b is dominated by the Ru ~(2+)/Ru ~(3+) redox couple (E _(1/2) from 1.33 to 1.34 V), the Fe ~(2+)/Fe ~(3+) redox couples (E _(1/2) from 0.46 to 0.80 V), and the tpy/tpy ~-/tpy ~(2-) redox couples (E _(1/2) from -1.19 to -1.48 V). The UV-vis spectra of 6a and 6b show absorption bands assigned to the ~1[(d(π) _(Fe)) ~6] → ~1[(d(π) _(Fe)) ~5(π* _(tpy) ~(Ru)) ~1] MMLCT transition at ~555 nm. Complexes 6a and 6b are luminescent in H _2O-CH _3CN (4:1, v/v) solution at room temperature, and 6b exhibits the strongest luminescence intensity (λ _(max) ~(em): 710 nm, Φ _(em): 2.28 × 10 ~(-4), τ: 358 ns) relative to analogous ferrocene-based bis(terpyridine) Ru(ii) complexes reported so far.
机译:两个新的炔基桥对称双三齿配体1,2-双(1'-[4'-(2,2':6',2''-吡啶基)]二茂铁基)乙炔(3a; tpy-Fc-CC- Fc-tpy; Fc =二茂铁基; tpy =叔吡啶基)和1,4-双(1'-[4'-(2,2':6',2''-叔吡啶基)]二茂铁基)-1,3-丁二炔( 3b; tpy-Fc-CC-CC-Fc-tpy)及其Ru〜(2+)配合物6a和6b已合成并通过循环伏安法,UV-vis和发光光谱法进行了表征,在3b情况下通过单一-晶体X射线衍射。两种化合物3a和3b的循环伏安图均显示两个严重重叠的二茂铁基氧化峰,其中只有一个还原峰。 6a和6b的氧化还原行为主要由Ru〜(2 +)/ Ru〜(3+)氧化还原对(E _(1/2)从1.33至1.34 V),Fe〜(2 +)/ Fe决定〜(3+)氧化还原对(E _(1/2)从0.46至0.80 V),以及tpy / tpy〜-/ tpy〜(2-)氧化还原对(E _(1/2)从-1.19至-1.48 V)。 6a和6b的UV-vis光谱显示了分配给〜1 [(d(π)_(Fe))〜6]→〜1 [(d(π)_(Fe))〜5(π*)的吸收带_(tpy)〜(Ru))〜1]在〜555 nm处的MMLCT跃迁。配合物6a和6b在室温下在H _2O-CH _3CN(4:1,v / v)溶液中发光,而6b则显示出最强的发光强度(λ_(max)〜(em):710 nm,Φ_( em):2.28×10〜(-4),τ:358 ns)相对于迄今为止报道的类似的基于二茂铁的双(叔吡啶)Ru(ii)配合物。

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