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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Understanding the Two-Photon Absorption Spectrum of PE2 Platinum Acetylide Complex
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Understanding the Two-Photon Absorption Spectrum of PE2 Platinum Acetylide Complex

机译：了解PE2铂族乙酰内酯络合物的双光子吸收光谱

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摘要

Herein, we report on the two-absorption crosssection spectrum of trans-Pt(PBu_3)_2 (C≡C-C_6H_4-C≡C-C_6H_5)_2 (PE2) platinum acetylide complex employing the femtosecond wavelength-tunable Z-scan technique. The PE2 complex can be visualized as two branches containing two phenylacetylene units, each one linked by a platinum center, completely transparent in the visible region. Because of this structure, large delocalization of π-electrons allied to the strong intramolecular interaction between the branches is expected. The 2PA absorption spectrum was measured using the femtosecond wavelength-tunable Z-scan technique with low repetition rate (1 kHz), in order to obtain the 2PA spectrum without excited-state contributions. Our results reveal that PE2 in dichloromethane solution presents two 2PA allowed bands located at 570 and 710 nm, with cross section of about 320 and 45 GM, respectively. The first one is related to the strong intramolecular interaction between the molecule's branches due to the presence of platinum atom, while the second one is associated with the breaking of symmetry of the chromophore in solution due, most probably to a large twisting angle of the ligand's phenyl rings relative to the Pt core.
机译：本文中，我们使用飞秒波长可调Z扫描技术报告了反式Pt（PBu_3）_2（C≡C-C_6​​H_4-C≡C-C_CH6H_5）_2（PE2）乙炔铂络合物的吸收光谱。可以将PE2配合物可视化为包含两个苯乙炔单元的两个分支，每个分支都由一个铂中心连接，在可见区域内完全透明。由于这种结构，与分支之间的强分子内相互作用相关的π电子的大的离域化是可预期的。为了获得没有激发态贡献的2PA光谱，使用飞秒波长可调Z扫描技术以低重复频率（1 kHz）测量2PA吸收光谱。我们的结果表明，二氯甲烷溶液中的PE2在570 nm和710 nm处出现两个2PA允许带，分别具有约320 GM和45 GM的横截面。第一个与由于铂原子的​​存在而导致的分子分支之间的强分子内相互作用有关，而第二个与溶液中发色团的对称性破坏有关，这很可能是由于配体的大扭转角所致。相对于Pt核的苯环。

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