Subpicosecond transient dynamics in gold nanoparticles encapsulated by a fluorophore-terminated monolayer

Article Abstract:

The gold nanoparticles (2.2 nm) protected by a densely packed monolayer of 9-(9-fluorenyl)-nonane-1-thiol or a mixed monolayer of 9-(9-fluorenyl)-alkane-1-thiol with nonane-1-thiol was studied by transient spectroscopy upon 305 nm excitation with subpicosecond laser pulses. The energy transfer from the excited fluorene to the gold nanocore is a dominant relaxation mode for the fluorene excitons in chromophore-labeled monolayer protected gold chains.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Gold Compounds, Optical properties, Monomolecular films

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Ultrafast nonradiative relaxation dynamics of eumelanin

Article Abstract:

The primary photodynamics of eumelanin from Sepia officinalis following UV-A excitation is examined using the degenerate pump-probe femtosecond spectroscopy. It could be concluded that the repopulation of the ground electronic state is the dominant nonradiative process in eumelanin and the time constants revealed by the nonexponential decays of the emission.

Observations, Spectrum analysis, Spectroscopy, Melanin, Chemical properties

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Time-resolved spectroscopic studies of radiationless decay processes in photoexcited hemocyanins

Article Abstract:

LMCT state in both proteins decays to the ground state suggests that photoexcitation of oxy Hc leads to the dissociation of O2. Photoacoustic calorimetry and fematosecond transient absorption spectroscopy have been used to characterize the dynamics that occur following photoexcitation of the 345 nm LMCT band of oxy Hc isolated.

Proteins, Absorption spectra

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