Spectral properties of tetraanionic porphyrin in formamide colloids of layered double hydroxides

• Autorzy: Juraj Bujdák , Nobuo Iyi
• Języki publikacji: EN

Abstrakty

EN

Formamide colloidal suspensions of layered double hydroxides (LDHs) with anionic dye, meso-tetrakis(4-sulfonatophenyl)porphine (TPPS) were prepared. Optical properties of these suspensions were investigated by means of absorption and fluorescence spectroscopies in the visible region. For more detailed characterization, second derivative curves of the spectra were calculated. The adsorption of the dye on LDH nanosheets led to partial molecular aggregation, reflected in significant changes of the dye optical properties. The Soret band in the absorption spectra was split into two peaks and decreased in intensity. Changes were observed also for the Q-bands. The molecular aggregation significantly quenched the emission of the dye. The low intensity emission from dye H-aggregates was identified at slightly longer wavelengths. The molecular aggregation increased with the dye/LDH ratio. At low dye loadings, the optical properties were very similar to the dye solution. The yields of the dye molecular aggregation increased with LDH surface charge. [...]

Słowa kluczowe

EN

Anionic porphyrins; Hydrotalcites; Molecular aggregation; H-aggregates; Dyes

• Czasopismo: Open Chemistry
• Rocznik: 2008
• Tom: 6
• Numer: 4
• Strony: 569-574

Daty

wydano

2008-12-01

online

2008-10-28

Twórcy

autor

Juraj Bujdák

• Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36, Bratislava, Slovakia,

autor

Nobuo Iyi

• National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0044, Japan

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Identyfikatory

DOI

10.2478/s11532-008-0074-8