Two photon absorption properties of four coordinated transition metal complexes of tetraarylazadipyrromethene compounds
| Autor: | Elif Akhüseyin, Ahmet Karatay, O. Türkmen, Mustafa Hayvali, Gökhan Sevinç, Betül Küçüköz, Halil Yılmaz, Halime Gul Yaglioglu, Kejing Xu |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Metal K-edge General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Two-photon absorption Metal L-edge 0104 chemical sciences Metal Transition metal visual_art Ultrafast laser spectroscopy visual_art.visual_art_medium Physical chemistry Density functional theory Physical and Theoretical Chemistry 0210 nano-technology Absorption (electromagnetic radiation) |
| Zdroj: | Physical chemistry chemical physics : PCCP. 18(6) |
| ISSN: | 1463-9084 |
| Popis: | New tetraarylazadipyrromethene metal complexes with four coordinate metals (cobalt(II), nickel(II), copper(II) and zinc(II)) and with three moieties (4-methylphenyl,4-methoxyphenyl and 1-naphthyl) were designed and synthesized targeting applications utilizing two photon absorption. The effects of metals with filled or unfilled d orbitals and substituents with various electron donor properties on the charge transfer mechanism and two photon absorption properties of tetraarylazadipyrromethene compounds were investigated by ultrafast pump-probe spectroscopy and open aperture Z-scan experiments as well as density functional theory (DFT) calculations. Ultrafast transient absorption spectra provide evidence of an efficient photoinduced intramolecular charge transfer between the ligand and metals which is independent of filled or unfilled d orbitals of metals. Although zinc has filled d orbitals, its complexes possess an absorption maximum including a shoulder which is attributed to partial ligand to metal L(pi) -> M(d*) charge transfer character (LMCT). Due to the charge transfer mechanism, metal complexes of tetraarylazadipyrromethene compounds exhibited two photon absorption properties in the femtosecond regime at 800 nm wavelength. The greatest two photon absorption cross section value was measured as 2690 GM for Zn(L-2)(2) and 2374 GM for Co(L-3)(2) complexes. |
| Databáze: | OpenAIRE |
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