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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Narrow-line and broadband spectra of iridium(III) complexes in a Shpol'skii matrix and an amorphous host
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Narrow-line and broadband spectra of iridium(III) complexes in a Shpol'skii matrix and an amorphous host

机译：Shpol'skii基质和无定形主体中铱（III）配合物的窄谱和宽带谱

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摘要

Narrow-line emission and excitation spectra of the lowest triplet state have been studied in a Shpol'skii host (n-octane) for three cyclometalated IrL(2)acac complexes of current practical interest. The ligands L and acac are the C-deprotonated anions of 2-phenylpyridine, 2-benzothienylpyridine, 1-phenylisoquinoline, and acetylacetone. The occurrence of narrow lines is surprising for such nonplanar structures. Individual triplet sublevels are identified, and a striking intensity effect is observed in a magnetic field. Broadband spectra and lifetime data of the complexes in PMMA yield additional properties of the individual sublevels-radiative and nonradiative decay rates and emission spectra. The data are consistent with the assumption that these individual rates and spectra are approximately independent of temperature. For each complex, the decay rates vary by a factor of >= 20 among the three sublevels, and that of the lowest sublevel is the smallest, but rates of radiative and nonradiative decay generally vary in parallel for all three sublevels. The individual sublevels have significantly different spectra. These regularities appear to be universal characteristics of Ir(III) and Pt(II) complexes. They cannot be explained solely on the basis of the symmetries of the electronic states because the symmetry of the present complexes is too low.
机译：在Shpol'skii主体（正辛烷）中研究了三种具有实际实用价值的IrL（2）acac配合物，研究了最低三重态的窄线发射光谱和激发光谱。配体L和acac是2-苯基吡啶，2-苯并噻吩基吡啶，1-苯基异喹啉和乙酰丙酮的C-去质子化的阴离子。对于这种非平面结构，窄线的出现是令人惊讶的。识别出各个三重态子水平，并在磁场中观察到惊人的强度效应。 PMMA中配合物的宽带光谱和寿命数据产生了各个子水平的附加特性，包括辐射和非辐射衰减率和发射光谱。数据与这些独立的速率和光谱与温度近似无关的假设是一致的。对于每个复合体，三个子级别之间的衰减率变化> 20倍，而最低子级别的衰减率最小，但是对于所有三个子级别，辐射衰减率和非辐射衰减率通常并行变化。各个子级别具有明显不同的光谱。这些规律性似乎是Ir（III）和Pt（II）配合物的普遍特征。不能仅仅根据电子态的对称性来解释它们，因为当前络合物的对称性太低。

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