The effect of aromatic and non-aromatic ionic liquids on the optical nonlinearity responses of porphyrins

• Published in: Journal of molecular liquids 2022-02, Vol.348, p.118398, Article 118398
• Main Authors: Sabbaghan, Maryam, Nadafan, Marzieh, Ahmadi, Vahid Jan
• Format: Article
• Language: English
• Subjects: Co(II) porphyrin complex; Cobalt ion; Ionic Liquid; Polarization; Porphyrin; Z-scan
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2021.118398

[Display omitted] •Ionic liquids increased NLO response of porphyrins.•DABCO-based ionic liquid increased nonlinear optical response of porphyrin more than imidazolium-based ionic liquid.•Imidazolium based ionic liquid effect on NLO response of Co(II)porphyrin complex more than DABCO based ionic liquid. The effects of adding aromatic and nonaromatic ionic liquids (ILs) on third-order nonlinear optical (NLO) responses of 5,10,15,20-Tetrakis(4-methoxycarbonylphenyl) porphyrin (S1) and [5,10,15,20-Tetrakis(4-methoxycarbonylphenyl)-porphyrin]–Co (II) (S2) at 532 nm were investigated using the Z-scan technique. ILs show negligible nonlinear response in compare with porphyrins. A significant increase in NLO response with adding DABCO-based IL to S1 was observed which approximately equal to Cobalt(II) ion substitution at the core of porphyrin structure. The obtained value of nonlinear absorption coefficient β (cm/W) and the nonlinear refractive index n2 (cm2/W), are of the order of 10−4 and 10−8, respectively. The positive synergetic effects were interpreted for enhanced nonlinear optical response by adding imidazolium-based IL and Cobalt(II) ion substitution at the core of porphyrin structure. Using ILs as additive led to excellent nonlinear properties which implies their promising applications in the optical devices.