Characterization of the Singlet and Triplet Excited States of 3-Chloro-4-methylumbelliferone

2011 ◽  
Vol 115 (30) ◽  
pp. 8392-8398 ◽  
Author(s):  
J. Sérgio Seixas de Melo ◽  
Catarina Cabral ◽  
João C. Lima ◽  
António L. Maçanita
Keyword(s):  
Excited States ◽  
Triplet Excited States

Nature and characterization of the singlet and triplet excited states of the dibenzylideneacetone and di-3-(N-ethylcarbazoylidene)acetone bridging ligands

1992 ◽  
Vol 70 (11) ◽  
pp. 2777-2784 ◽  
Author(s):  
Pierre D. Harvey ◽  
Benoit Daoust
Keyword(s):  
Excited States ◽  
Model Compound ◽  
Energy Transition ◽  
Quantum Yields ◽  
Bridging Ligands ◽  
Fluorescence Quantum Yields ◽  
A Charge ◽  
Triplet Excited States ◽  
First Time

The lowest energy singlet state in di-3-(N-ethylcarbazoylidene)acetone (dNECa), a luminescent model compound at room temperature for dibenzylideneacetone (dba), has been assigned to a charge transfer (CT) state using the medium polarity effect on λmax(F) and the fluorescence polarized spectra of dNECa at 77 K. The dNECa fluorescence quantum yields [Formula: see text] and lifetimes (τF) are solvent sensitive where both [Formula: see text] and τF tend to increase with polarity. The very weak and moderately structured phosphorences have been located for the first time for both dba and dNECa in the 550–800 nm range and are also assigned to a CT state. In this case the CT interactions are less pronounced than λ(0–0)P and τP are much less solvent sensitive. Finally, EHMO type calculations confirm that the CT transition is the lowest energy transition in dba and di-3-(N-methylindoylidene)acetone (a model compound for dNECa), but also suggest that the nπ* state must lie near the CT state in dba.

Theoretical Characterization of the Lowest Triplet Excited States of the Tris-(1,4,5,8-tetraazaphenanthrene) Ruthenium Dication Complex

2008 ◽  
Vol 47 (12) ◽  
pp. 5259-5266 ◽  
Author(s):  
Fabienne Alary ◽  
Martial Boggio-Pasqua ◽  
Jean-Louis Heully ◽  
Colin J. Marsden ◽  
Patricia Vicendo
Keyword(s):  
Excited States ◽  
Theoretical Characterization ◽  
Triplet Excited States

Sn(iv) Schiff base complexes: triplet photosensitizers for photoredox reactions

2014 ◽  
Vol 43 (47) ◽  
pp. 17754-17765 ◽  
Author(s):  
Tod A. Grusenmeyer ◽  
Albert W. King ◽  
Joel T. Mague ◽  
Jeffrey J. Rack ◽  
Russell H. Schmehl
Keyword(s):  
Schiff Base ◽  
Excited States ◽  
Schiff Base Complexes ◽  
Synthesis And Characterization ◽  
Triplet Excited States

We present the synthesis and characterization of a series of four fluorescent Sn(iv) Schiff base complexes, which also possess long-lived triplet excited states.

scholarly journals Interplay between singlet and triplet excited states in a conformationally locked donor–acceptor dyad

2015 ◽  
Vol 44 (44) ◽  
pp. 19207-19217 ◽  
Author(s):  
Mikhail A. Filatov ◽  
Fabian Etzold ◽  
Dominik Gehrig ◽  
Frédéric Laquai ◽  
Dmitri Busko ◽  
...  
Keyword(s):  
Excited States ◽  
Donor Acceptor ◽  
Triplet Excited States ◽  
Conformationally Locked

The synthesis and photophysical characterization of a palladium(ii) porphyrin – anthracene dyad bridged via short and conformationally rigid bicyclo[2.2.2]octadiene spacer were achieved.

A Thorough Theoretical Exploration of Intriguing Characteristics of Cyclo[18]carbon: Geometry, Bonding Nature, Aromaticity, Weak Interaction, Reactivity, Excited States, Vibrations, Molecular Dynamics and Various Molecular Properties

2019 ◽  
Author(s):  
Tian Lu ◽  
Qinxue Chen ◽  
Zeyu Liu
Keyword(s):  
Molecular Dynamics ◽  
Excited States ◽  
Electronic Excitation ◽  
Ring Structure ◽  
Molecular Properties ◽  
Molecular Vibration ◽  
Full Characterization ◽  
Long Time ◽  
Almost All

Although cyclo[18]carbon has been theoretically and experimentally investigated since long time ago, only very recently it was prepared and directly observed by means of STM/AFM in condensed phase (Kaiser et al., <i>Science</i>, <b>365</b>, 1299 (2019)). The unique ring structure and dual 18-center π delocalization feature bring a variety of unusual characteristics and properties to the cyclo[18]carbon, which are quite worth to be explored. In this work, we present an extremely comprehensive and detailed investigation on almost all aspects of the cyclo[18]carbon, including (1) Geometric characteristics (2) Bonding nature (3) Electron delocalization and aromaticity (4) Intermolecular interaction (5) Reactivity (6) Electronic excitation and UV/Vis spectrum (7) Molecular vibration and IR/Raman spectrum (8) Molecular dynamics (9) Response to external field (10) Electron ionization, affinity and accompanied process (11) Various molecular properties. We believe that our full characterization of the cyclo[18]carbon will greatly deepen researchers' understanding of this system, and thereby help them to utilize it in practice and design its various valuable derivatives.

A Thorough Theoretical Exploration of Intriguing Characteristics of Cyclo[18]carbon: Geometry, Bonding Nature, Aromaticity, Weak Interaction, Reactivity, Excited States, Vibrations, Molecular Dynamics and Various Molecular Properties

2019 ◽  
Author(s):  
Tian Lu ◽  
Qinxue Chen ◽  
Zeyu Liu
Keyword(s):  
Molecular Dynamics ◽  
Excited States ◽  
Electronic Excitation ◽  
Ring Structure ◽  
Molecular Properties ◽  
Molecular Vibration ◽  
Full Characterization ◽  
Long Time ◽  
Almost All

Although cyclo[18]carbon has been theoretically and experimentally investigated since long time ago, only very recently it was prepared and directly observed by means of STM/AFM in condensed phase (Kaiser et al., <i>Science</i>, <b>365</b>, 1299 (2019)). The unique ring structure and dual 18-center π delocalization feature bring a variety of unusual characteristics and properties to the cyclo[18]carbon, which are quite worth to be explored. In this work, we present an extremely comprehensive and detailed investigation on almost all aspects of the cyclo[18]carbon, including (1) Geometric characteristics (2) Bonding nature (3) Electron delocalization and aromaticity (4) Intermolecular interaction (5) Reactivity (6) Electronic excitation and UV/Vis spectrum (7) Molecular vibration and IR/Raman spectrum (8) Molecular dynamics (9) Response to external field (10) Electron ionization, affinity and accompanied process (11) Various molecular properties. We believe that our full characterization of the cyclo[18]carbon will greatly deepen researchers' understanding of this system, and thereby help them to utilize it in practice and design its various valuable derivatives.

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