scholarly journals Luminescence emission from Neurospora copper metallothionein. Time-resolved studies

1989 ◽  
Vol 260 (1) ◽  
pp. 189-193 ◽  
Author(s):  
M Beltramini ◽  
G M Giacometti ◽  
B Salvato ◽  
G Giacometti ◽  
K Münger ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Triplet Excited State ◽  
Model Compounds ◽  
Compact Structure ◽  
Time Resolved ◽  
Luminescence Emission ◽  
Bimolecular Quenching ◽  
Quenching By Oxygen

The luminescence lifetime of Cu-metallothionein from the fungus Neurospora crassa has been studied by the frequency-domain emission technique. Lifetimes of 10.3 and 3.4 microseconds have been found for the protein in the absence and in the presence of oxygen respectively. Binding of Hg(II) results in a quenching of the luminescence correlated to the shortening of lifetime to 0.3-0.4 microsecond. No quenching by oxygen is found for the Hg(II)-Cu-metallothionein adduct. By analogy to model compounds, luminescence emission is attributed to a triplet excited state of a Cu(I)-to-sulphur charge-transfer complex. The comparison of bimolecular quenching constants for O2 and acrylamide indicates a highly compact structure of the protein.

scholarly journals Anion-enhanced excited state charge separation in a spiro-locked N-heterocycle-fused push-pull zinc porphyrin

2021 ◽  
Author(s):  
Mandeep K. Chahal ◽  
Anuradha Liyanage ◽  
Ajyal Z. Alsaleh ◽  
Paul A. Karr ◽  
Jonathan P. Hill ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Charge Separation ◽  
Charge Transfer Complex ◽  
Zinc Porphyrin ◽  
New Type ◽  
State Charge

A new type of push–pull charge transfer complex, viz., a spiro-locked N-heterocycle-fused zinc porphyrin, ZnP-SQ, is shown to undergo excited state charge separation, which is enhanced by axial F− binding to the Zn center.

scholarly journals Exploring the Franck-Condon region of a photoexcited charge transfer complex in solution to interpret femtosecond stimulated Raman spectroscopy: excited state electronic structure methods to unveil non-radiative pathways

2021 ◽  
Author(s):  
Federico Coppola ◽  
Paola Cimino ◽  
Umberto Raucci ◽  
Maria Gabriella Chiariello ◽  
Alessio Petrone ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Electronic Structure ◽  
Excited State ◽  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Main Role ◽  
Photoinduced Charge Transfer ◽  
Electronic Structure Methods ◽  
Franck Condon ◽  
Photoinduced Charge

We present electronic structure methods to unveil non-radiative pathways of photoinduced charge transfer (CT) reactions that play a main role in photophysics and light harvesting technologies. A prototypical π-stacked molecular...

scholarly journals Structure of the triplet excited state of bromanil from time-resolved resonance Raman spectra and simulation

2001 ◽  
Vol 115 (13) ◽  
pp. 6106-6114 ◽  
Author(s):  
Mrinalini Puranik ◽  
Siva Umapathy ◽  
Jaap G. Snijders ◽  
Jayaraman Chandrasekhar
Keyword(s):  
Excited State ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Triplet Excited State ◽  
Time Resolved ◽  
Resonance Raman Spectra

scholarly journals Time-Resolved Spectroscopy of the Metal-to-Metal Charge Transfer Excited State in Dinuclear Cyano-Bridged Mixed-Valence Complexes

2005 ◽  
Vol 44 (15) ◽  
pp. 5530-5536 ◽  
Author(s):  
Brendan P. Macpherson ◽  
Paul V. Bernhardt ◽  
Andreas Hauser ◽  
Stéphane Pagès ◽  
Eric Vauthey
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Mixed Valence ◽  
Time Resolved ◽  
Metal Charge ◽  
Time Resolved Spectroscopy ◽  
Metal Charge Transfer

Application of time-resolved linear dichroism spectroscopy: Intensity borrowing in charge transfer complex absorption spectra

2003 ◽  
Vol 81 (6) ◽  
pp. 567-574
Author(s):  
Dustin Levy ◽  
Bradley R Arnold
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Chlorinated Solvents ◽  
Linear Dichroism ◽  
Charge Transfer Transition ◽  
Time Resolved ◽  
Transition Energies ◽  
Charge Transfer Transitions ◽  
Donor Acceptor ◽  
Influence Of Solvent

Time-resolved linear dichroism spectroscopy has been used to study the influence of solvent on the charge transfer complex formed between hexamethylbenzene and 1,2,4,5-tetracyanobenzene. It was shown that cyano-substituted solvents induce a 1500 cm–1 increase in the charge transfer transition energies relative to those observed in chlorinated solvents. Furthermore, the angle between the charge transfer absorption transition moments and the photochemically produced radical anion absorption transition moment, after relaxation, has been measured for this complex in several solvents. A simple model was used to correlate the angles measured using time-resolved linear dichroism spectroscopy with the extent of localized excitation mixed into the charge transfer transitions. These measurements reveal that different charge transfer transitions borrow intensity from the localized excitation to different extents. By using different excitation wavelengths, the partitioning of the borrowed intensity among the charge transfer transitions of this complex could be evaluated for the first time.Key words: 1,2,4,5-tetracyanobenzene, hexamethylbenzene, donor–acceptor complex, photoinduced electron transfer, photoselection.

Switching of the triplet excited state of the C60-dimethylaminostyryl BODIPY dyads/triads

2015 ◽  
Vol 3 (3) ◽  
pp. 538-550 ◽  
Author(s):  
Ling Huang ◽  
Jianzhang Zhao
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Triplet Excited State ◽  
Acid Base ◽  
Time Resolved ◽  
Difference Absorption

Switching of the triplet excited state of BODIPY-C60 dyads/triads with acid/base was studied with nanosecond time-resolved transient difference absorption spectroscopy.

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