Abstract
For the copper complex of pyrazinoporphyrazine AzaPhcCu(C(CH3)3)8 in CH2Cl2, we use nanosecond pulses to measure its third-order nonlinear optic effects at 532 nm. The results show that its effective third-order nonlinear refractive index n eff 2 (−7.85 × 10−10 esu) is larger than that of the AzaPhcCu(C12H25)4 and the CuPc(OC5H11)8. The reverse saturable absorption (RSA) of AzaPhcCu-(C(CH3)3)8 is demonstrated by the ratio of effective excited state to ground state absorption cross sections. The observed intersystem crossing lifetime τisc of AzaPhcCu(C(CH3)3)8 (∼15 ns) and AzaPhcCu(C12H25)4 (∼45 ns) are longer than that of CuPc(OC5H11)8 (∼5.0 ns). The aza-substituents are suggested to form a S1(n, π*) state as their lowest excited singlet-states, and their radiationless intersystem crossing rates (1/τisc) are discussed with the spin-orbit coupling 〈ψS|H SO|ψT〉 and the vibronic coupling 〈χS|χT〉 effects between S1 and T1 states.
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Hwang, L., Tsai, C., Tiao, C. et al. Optic nonlinearities of a copper complex of pyrazinoporphyrazine. Optical and Quantum Electronics 32, 641–656 (2000). https://doi.org/10.1023/A:1007080607632
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DOI: https://doi.org/10.1023/A:1007080607632