Nonlinear Optical Properties of Porphyrin, Fullerene and Ferrocene Hybrid Materials.

Nonlinear Optical Properties of Porphyrin, Fullerene and Ferrocene Hybrid Materials.
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DOI:
10.3390/ma14164404
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发表时间:
2021-08-06
期刊:
Materials (Basel, Switzerland)
影响因子:
--
通讯作者:
Tagliatesta P
Tagliatesta P
中科院分区:
其他
文献类型:
--
作者:
Limosani F;Tessore F;Di Carlo G;Forni A;Tagliatesta P

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在本研究中,我们研究了由内消旋四苯基卟啉 P(作为游离碱和 ZnII 络合物)形成的多组分杂化材料的二阶非线性光学 (NLO) 性质,该材料在 2 或 2,12 β-吡咯位上携带电子供体二茂铁 (Fc) 和/或电子受体富勒烯 (C60) 部分,连接到卟啉核心 经由乙炔基或乙炔基苯基间隔基。我们通过电场诱导二次谐波产生 (EFISH) 技术在 CH2Cl2 溶液中以 1907 nm 入射波长测量了 NLO 响应,记录了所有研究的化合物意外的 μβ1907 负值。由于密度泛函理论 (DFT) 计算证明 P-Fc 二元组的基态偶极矩几乎为零,并且 P-C60 二元组和 Fc-P-C60 三元组的值非常低,因此我们的 EFISH 结果表明纯电子立方项 γ(−2ω; ω, ω, 0) 对 γEFISH 有重大贡献,该项在二次偶极取向项中占主导地位 μβ(−2ω; ω, ω)/5kT,经计算证据证实。
In this research, we investigated the second-order nonlinear optical (NLO) properties of multicomponent hybrid materials formed by meso-tetraphenylporphyrin P (both as free base and ZnII complex), carrying in 2 or 2,12 β-pyrrolic position an electron donor ferrocene (Fc), and/or an electron acceptor fullerene (C60) moiety, connected to the porphyrin core via an ethynyl or an ethynylphenyl spacer. We measured the NLO response by the electric-field-induced second-harmonic generation (EFISH) technique in CH2Cl2 solution with a 1907 nm incident wavelength, recording for all the investigated compounds unexpected negative values of μβ1907. Since density functional theory (DFT) calculations evidenced for P-Fc dyads almost null ground state dipole moments and very low values for P-C60 dyads and Fc-P-C60 triads, our EFISH results suggested a significant contribution to γEFISH of the purely electronic cubic term γ(−2ω; ω, ω, 0), which prevails on the quadratic dipolar orientational one μβ(−2ω; ω, ω)/5kT, as confirmed by computational evidence.
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