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Real-Time Probing of Fast Photoinduced Charge-Transfer in Electron Donor-Acceptor Model Compounds and in Biological Photosensors

Martin M. M., Plaza P., Changenet-Barret P.

Polish Journal of Chemistry

2008

Vol. 82, nr 4

759-771

We review some of our results on the role of solvent reorganization as an actual reaction coordinate in a few photoinduced charge-transfer processes concerning: dimethylaminobenzonitrile (DMABN), bianthryl and its 10-cyano-derivative and anthracenedimethylaniline (ADMA), in solution at room temperature. These processes were studied by subpicosecond transient absorption spectroscopy. We also describe some of our recent results on charge-transfer processes involved in the primary response of photoactive proteins such as the photoactive yellow protein (PYP) and the oxyblepharismin-binding protein (OBIP). The deciding role of the protein environment in the photophysics of the chromophore is emphasized.

Spin-entropy driven charge transfer phase transition in iron mixed-valence system

Kojima N., Itoi M., Ono Y., Okubo M., Enmoto M.

Materials Science

2003

Vol. 21, No. 2

181-189

We have synthesized iron mixed-valence complexes, (n-CnH2n+1)4N[FeIIFeIIIX3] (X = mto(C2O3S), dto(C2O2S2), tto(C2OS3)) and have investigated their physical properties by means of 57Fe Mössbauer spectroscopy, magnetic susceptibility and electrical resistivity measurements. From the analysis of 57Fe Mössbauer spectra, magnetic susceptibility and electrical resistivity, we have discovered a new type of first order phase transition around 120°K for (n-CnH2n+1)4N[FeIIFeIII(dto)3](n = 3, 4), where the charge transfer transition between FeII and FeIII occurs reversibly. In the higher temperature phase, the FeIII (S = 1/2) and FeII (S = 2) sites are coordinated by six S atoms and six O atoms, respectively. In the lower temperature phase, on the other hand, the FeIII (S = 5/2) and FeII (S = 0) sites are coordinated by six O atoms and six S atoms, respectively. Moreover, we have found the ferromagnetic phase transition in this system. The ferromagnetic order is induced by the charge transfer interaction between the FeIII and FeII sites. Moreover, we propose various multifunctional properties for (n-CnH2n+1)4N[FeIIFeIII(mto)3] and (n-CnH2n+1)4N[FeIIFeIII(tto)3].

Low frequency vibrations in electroabsorption spectroscopy

Slawik M., Petelenz P.

Polish Journal of Chemistry

1998

Vol. 72, nr 7S

1584-1592

A simple to-state, two-mode model is proposed to probe the role of low-frequency vibrations in electroabsorption (EA) spectroscopy. The results demonstrate that explicit inclusion of such vibration in the model is necessary to reproduce the EA signals of Frenkel states, but essentially irrelevant for CT states.