A Global Instrumentation Approach To Resolution Of Ground-State And Excited-State Processes In Time-Resolved Fluorescence Spectroscopy

1988 ◽  
Author(s):  
J.B.Alexander Ross ◽  
William R. Laws ◽  
Herman R. Wyssbrod
Keyword(s):  
Excited State ◽  
Fluorescence Spectroscopy ◽  
Ground State ◽  
Time Resolved Fluorescence ◽  
Time Resolved

Spectral and Photoprototropic Characteristics of 4-Aminobiphenyl in β-Cyclodextrin

2004 ◽  
Vol 69 (4) ◽  
pp. 748-758 ◽  
Author(s):  
Israel V. Muthu Vijayan Enoch ◽  
Meenakshisundaram Swaminathan
Keyword(s):  
Excited State ◽  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Inclusion Complex ◽  
Ground State ◽  
Time Resolved Fluorescence ◽  
Neutral Form ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

The photophysical and photoprototropic behaviour of 4-aminobiphenyl (4ABP) in aqueous β-cyclodextrin (β-CDx) solution has been investigated using steady-state and time-resolved fluorescence spectroscopy. Fluorescence of the neutral form of 4ABP is enhanced due to the formation of a 1:1 complex with β-CDx. The formation of this complex has been confirmed by time-resolved spectroscopy. In the presence of β-CDx, no change was observed in the ground state pKa value but the excited state pKa value changed. Based on its photophysical and photoprototropic characteristics in β-CDx, the structure of the 1:1 inclusion complex is proposed.

scholarly journals Fluorescent chemosensors for metal ions based on 3-(2-benzoxazol-5-yl)alanine skeleton

2010 ◽  
Vol 8 (3) ◽  
pp. 674-686 ◽  
Author(s):  
Magda Milewska ◽  
Katarzyna Guzow ◽  
Wiesław Wiczk
Keyword(s):  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Metal Ions ◽  
Ground State ◽  
Transition Metal Ions ◽  
Fluorescent Chemosensors ◽  
Time Resolved Fluorescence ◽  
Absorption Bands ◽  
Time Resolved ◽  
Ratiometric Sensors

AbstractThe ability of new chelate ligands, benzoxazol-5-yl-alanine derivatives substituted in position 2 by heteroaromatic substituent, to form complexes with selected metal ions in acetonitrile are studied by means of absorption and steady-state and time-resolved fluorescence spectroscopy. Among the ligands studied, only azaaromatic derivatives form stable complexes with transition metal ions in the ground state. Their absorption bands are bathochromically shifted enabling to use those ligands as ratiometric sensors. The fluorescence of each ligand is quenched by metal ions, however, in the presence of Cd(II) and Zn(II) ions a new red shifted emission band is observed.

Polypeptides with pendant porphyrins of defined sequence of chromophores: towards artificial photosynthetic systems

2008 ◽  
Vol 12 (12) ◽  
pp. 1232-1241 ◽  
Author(s):  
Farid Aziat ◽  
Régis Rein ◽  
Jorge Peón ◽  
Ernesto Rivera ◽  
Nathalie Solladié
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Amino Acid ◽  
Fluorescence Spectroscopy ◽  
Photophysical Properties ◽  
Free Base ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Absorption And Fluorescence Spectroscopy ◽  
Artificial Photosynthetic

In this paper we now report our ongoing progress in the preparation of artificial photosynthetic systems through the preparation of light harvesting multi-porphyrins. A tetramer, constituted of a central dipeptide functionalized by two free-base porphyrins and surrounded by one amino-acid bearing a pendant Zn ( II ) porphyrin on each side, has been chosen. The optical and photophysical properties of this tetramer have been studied by absorption and fluorescence spectroscopy. In addition, the energy transfer phenomenon has been studied and monitored by femtosecond time-resolved fluorescence. Our results indicate that the excited state dynamics redounding in the excitation being localized in the inner free-base porphyrins takes place in the time scale of approximately 1 ps.

Excited-state intramolecular proton transfer and conformational relaxation in 4′-N,N-dimethylamino-3-hydroxyflavone doped in acetonitrile crystals

2016 ◽  
Vol 18 (41) ◽  
pp. 28564-28575 ◽  
Author(s):  
Kazuki Furukawa ◽  
Norifumi Yamamoto ◽  
Kazuyuki Hino ◽  
Hiroshi Sekiya
Keyword(s):  
Excited State ◽  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Proton Transfer ◽  
Intramolecular Proton Transfer ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Conformational Relaxation ◽  
Excited State Dynamics

Excited-state dynamics of 4′-N,N-dimethylamino-3-hydroxyflavone doped in acetonitrile crystals has been investigated by using steady-state and time-resolved fluorescence spectroscopy.

Time-resolved fluorescence spectroscopy study of excited state dynamics of alkyl- and benzo-substituted triphyrin(2.1.1)

2014 ◽  
Vol 16 (26) ◽  
pp. 13129-13135 ◽  
Author(s):  
Yusuke Iima ◽  
Daiki Kuzuhara ◽  
Zhao-Li Xue ◽  
Seiji Akimoto ◽  
Hiroko Yamada ◽  
...  
Keyword(s):  
Excited State ◽  
Fluorescence Spectroscopy ◽  
Spectroscopy Study ◽  
Time Resolved Fluorescence ◽  
Radiative Relaxation ◽  
Time Resolved ◽  
Excited State Dynamics

Non-radiative relaxation in triphyrin(2.1.1) is found to be due to non-planarity of the macrocycle.

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