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:
影响因子:
--
通讯作者:
Tagliatesta P
中科院分区:
文献类型:
--
作者:
Limosani F;Tessore F;Di Carlo G;Forni A;Tagliatesta P
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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