Electronic Energy Transfer and Collection in Luminescent Molecular Rods Containing Ruthenium(II) and Osmium(II) 2,2′:6′,2″-Terpyridine Complexes Linked by Thiophene-2,5-diyl Spacers
作者:Susana Encinas、Lucia Flamigni、Francesco Barigelletti、Edwin C. Constable、Catherine E. Housecroft、Emma R. Schofield、Egbert Figgemeier、Dieter Fenske、Markus Neuburger、Johannes G. Vos、Margareta Zehnder
[(tpy)Ru(3)Os(tpy)]4+ and trinuclear [(tpy)Ru(3)Os(3)Ru(tpy)]6- complexes (3 = 2,5-bis(2,2':6',2''-terpyridin-4-yl)thiophene) have been obtained and are compared with those of model mononuclear complexes and homometallic [(tpy)Ru(3)Ru(tpy)]4+, [(tpy)Os(3)Os(tpy)]4+ and [(tpy)Ru(3)Ru(3)Ru(tpy)]6+ Complexes. The bridging ligand 3 is nearly planar in the complexes, as seen from a preliminary X-ray determination of
Preparation and photophysical properties of precursors of inorganic macromolecules. Mono and binuclear complexes of Ru(II) and terpyridine derivatized with thiophene and 4′-(5-bromothiophene) groups
The preparation and characterization of mono and binuclearcomplexes of Ru(II) with a newly synthesized derivate of the terpyridine ligand, 4′-(5-bromothiophene)-2,2′,6′,2″-terpyridine, are communicated. In the binuclearcomplex, 2,5-bis(2,2′,6′,2″-terpyridine-4′yl)thiophene was used as a bridge between two Ru(II) centers. The new compounds were characterized by H NMR, UV–Vis and IR spectroscopies
介绍了Ru(II)与新合成的叔吡啶配体4'-(5-溴噻吩)-2,2',6',2''-叔吡啶的衍生物的单核和双核配合物的制备和表征。在双核络合物中,将2,5-双(2,2',6',2''-叔吡啶-4'基)噻吩用作两个Ru(II)中心之间的桥。新化合物通过1 H NMR,UV-Vis和IR光谱进行表征。在络合物的UV-Vis光谱中观察到Ru(II)到吡啶的电荷转移跃迁在〜500 nm处的谱带,以及在λ<400 nm处分配给配体内跃迁的吸收谱带π*←π,居中于tpy部分。在337或500 nm的CH3CN中辐照配合物可诱导发光,最大发光波长约为670 nm,寿命为τ⩽102ns。时间分辨吸收光谱揭示了在金属向配体电荷转移的激发态衰变过程中长寿命物种的形成。中间体暂定为配体取代或正金属化激发态反应的不稳定产物。
Luminescent molecular wires with 2,5-thiophenediyl spacers linking {Ru(terpy)2} units
作者:Edwin C. Constable、Catherine E. Housecroft、Emma R. Schofield、Susana Encinas、Nicola Armaroli、Francesco Barigelletti、Lucia Flamigni、Egbert Figgemeier、Johannes G. Vos
DOI:10.1039/a900617f
日期:——
Whereas Ru(terpy)2}2+ salts are essentially non-luminescent in fluid solution luminescent molecular wires with Ru(bpy)3}2+-like activity result when these units are connected by 2,5-thiophenediyl spacers.