Dini Danilo, Hanack Michael, Meneghetti Moreno
Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
J Phys Chem B. 2005 Jul 7;109(26):12691-6. doi: 10.1021/jp050519n.
The multiphoton absorption properties of the axially substituted tetrapyrazinotetraazaporphyrinato complex Pyz(4)TAPInCl (1) are reported and interpreted. In particular, the nonlinear optical transmission of the complex and the excited states involved in the nonlinear absorption have been determined at the frequency of the second harmonic generation of a Nd:YAG laser in the nanosecond time regime. Pyz(4)TAPInCl has an excited-state absorption cross section larger than its ground state in the 460-540 nm spectral region, and it shows an optical limiting (OL) behavior at 532 nm, which derives from a sequential two-photon absorption with a larger absorption cross section of the excited triplet state with respect to the ground state. It results that the absorption cross section of 1 in the excited triplet state is 7.8 x 10(-18) cm(2) vs 0.9 x 10(-18) cm(2) of the ground state at the wavelength of OL analysis.
报道并解释了轴向取代的四吡嗪并四氮杂卟啉配合物Pyz(4)TAPInCl (1)的多光子吸收特性。特别是，在纳秒时间范围内，已在Nd:YAG激光二次谐波产生的频率下测定了该配合物的非线性光学传输以及参与非线性吸收的激发态。在460 - 540 nm光谱区域，Pyz(4)TAPInCl的激发态吸收截面大于其基态吸收截面，并且它在532 nm处表现出光限幅(OL)行为，这源于顺序双光子吸收，其中激发三重态的吸收截面相对于基态更大。结果表明，在光限幅分析波长下，1的激发三重态吸收截面为7.8×10⁻¹⁸ cm²，而基态为0.9×10⁻¹⁸ cm²。
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