| Partner: Britton Jonathan |
Ostatnie publikacje
| 1. | Nwaji N., John M.♦, Jonathan B.♦, Tebello N.♦, Synthesis, photophysical and nonlinear optical properties of a series of ball-type phthalocyanines in solution and thin films, New Journal of chemistry, ISSN: 1144-0546, DOI: 10.1039/C6NJ03662G, Vol.41, pp.1-15, 2017 Streszczenie: In this study, we report on the enhanced nonlinear optical properties of novel tetrakis-4-(hexadecane-1,2-dioxyl)-bis(phthalocyaninato zinc(II)) (4), tetrakis-4-(hexadecane-1,2-dioxyl)-bis(phthalocyaninato gallium chloride) (5) and tetrakis-4-(hexadecane-1,2-dioxyl)-bis(phthalocyaninato indium chloride) (6) both in solution and when embedded in polymer thin films. Complexes 5 and 6 bearing heavy atoms showed enhanced triplet quantum yield and nonlinear optical response. The nonlinear third-order susceptibility and second-order hyperpolarizability values are also reported. Time dependent density functional theory (TD-DFT) calculations were performed in order to explain the origin of the observed UV-vis and magnetic circular dichroism (MCD) spectra of the complexes. Afiliacje autorów:
|  | |||||||||||||||||||||
| 2. | Nwaji N., Owolabi M. B.♦, Jonathan B.♦, Tebello N.♦, Photophysical and nonlinear optical study of benzothiazole substituted phthalocyanines in solution and thin films, Journal of Porphyrins and Phthalocyanines, ISSN: 1088-4246, DOI: 10.1142/S1088424617500079, Vol.21, pp.1-10, 2017 Streszczenie: In this study, the photophysical, nonlinear absorption and nonlinear optical limiting properties of zinc and gallium phthalocyanine complexes: tetrakis[(benzo[d]thiazol-2-yl phenoxy)phthalocyaninato]zinc(II) (3), tetrakis[(benzo[d]thiazol-2-yl phenoxy)phthalocyaninato] gallium(III) chloride (4), tetrakis[(benzo[d]thiazol-2-ylthio)phthalocyaninato] zinc(II) (5), tetrakis[(benzo[d]thiazol-2-ylthio)phthalocyaninato] gallium(III) chloride (6), were investigated both in solution and when embedded in polystyrene thin films using 532 nm laser excitation at 10 ns pulses. It was also observed that complexes that have higher triplet state absorption also possessed enhanced nonlinear and optical limiting behavior. Superior optical performance was observed when the complexes were embedded in thin films compared to when they are in solution. Complex 6 in thin films gave the highest imaginary third-order susceptibility (Im Afiliacje autorów:
| | |||||||||||||||||||||
| 3. | Nwaji N., David O. O.♦, John M.♦, Marcel L.♦, Samson K.♦, Jonathan B.♦, Tebello N.♦, Improved nonlinear optical behaviour of ball type indium (III) phthalocyanine linked to glutathione capped nanoparticles, Dyes and Pigments, ISSN: 1873-3743, DOI: 10.1016/j.dyepig.2017.01.066, Vol.140, pp.417-430, 2017 Streszczenie: The synthesis of ball–type indium phthalocyanine (complex 4) and its covalent attachment to glutathione (GSH–) capped (Ag, Au, CdTeSe, CdTeSe/ZnO) nanoparticles are reported in this work. Furthermore, their photophysical and nonlinear optical behaviour were investigated. We observed a decrease in the fluorescence quantum yield with corresponding increase in the triplet quantum yield of the nanoconjugates in comparison to complex 4 alone. The reverse saturable absorption was found to be dependent on excited state absorption. The optical limiting threshold ranges from 0.40–0.78 (J/cm2). The nanoconjugate of the complex 4 with GSH–CdTeSe/ZnO (QD1) accounted for the most improved triplet state parameters and nonlinear optical behaviour in comparison to complex 4 and the other nanoconjugates studied in this work. Afiliacje autorów:
| |