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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Triplet Excited States of Some Thiophene and Triazole Substituted Platinum(II) Acetylide Chromophores
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Triplet Excited States of Some Thiophene and Triazole Substituted Platinum(II) Acetylide Chromophores

机译：某些噻吩和三唑取代的铂（II）乙酰苯胺发色团的三重态激发态

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摘要

The photophysical properties of a series of platinum(II) acetylide compounds (trans-Pt(PBu3)2(CtC-R)2) with the R group consisting of two or three aryl rings (phenyl, phenyl/thiophenyl, phenyl/triazolyl) linked together with ethynyl groups were systematically investigated. Four new structurally similar compounds are reported with: (i) a bithiophene unit in the ligands, (ii) methyl or (iii) methoxy substituents on the aryl ring ligands that promote a more twisted conformation along the long axis of the molecule, and (iv) with two different alkynylaryl ligands giving rise to an asymmetric substitution with respect to the photoactive metal ion center. The spectroscopic studies include optical absorption, spectrally and time-resolved luminescence, as well as transient absorption spectra. The ground-state UV absorption between 300 and 420 nm gave rise to fluorescence with quantum efficiencies in the range of 0.1-1% and efficient intersystem crossing to triplet states. Phosphorescence decay times were in the order of 10-500 s in oxygen-evacuated samples. The triplet states also lead to strong broadband triplet-triplet absorption between 400 and 800 nm. The complex with asymmetric substitution was found to populate two triplet states of different structure and energy.
机译：R系列由两个或三个芳基环（苯基，苯基/硫代苯基，苯基/三唑基）组成的一系列铂（II）乙炔化合物（反式-Pt（PBu3）2（CtC-R）2）的光物理性质与乙炔基连接在一起进行了系统的研究。报道了四种新的结构相似的化合物，其具有：（i）配体中的联噻吩单元，（ii）芳基环配体上的甲基或（iii）甲氧基取代基，可促进沿分子长轴的扭曲构象，以及（ iv）具有两个不同的炔基芳基配体，相对于光活性金属离子中心产生不对称取代。光谱研究包括光吸收，光谱和时间分辨的发光以及瞬态吸收光谱。在300至420 nm之间的基态UV吸收引起荧光，其量子效率在0.1-1％的范围内，并且有效的系统间交叉成为三重态。在抽真空的样品中，磷光衰减时间约为10-500 s。三重态还导致400至800 nm之间的宽带三重态三重态吸收很强。发现具有不对称取代的配合物填充了具有不同结构和能量的两个三重态。

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