Photophysics of novel 22! porphyrinoids
The photophysical properties of toluene solutions of two new 22π expanded porphycene compounds were measured using a combination of various steady-state and time-resolved techniques. The determined triplet energy (ET= 109 ± 3) kJ.mol⁻¹, coincident with the calculated ET = (96.0 ± 10) kJ.mol⁻¹, of bo...
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| Formato: | Articulo |
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2012
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/159381 |
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I19-R120-10915-159381 |
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I19-R120-10915-1593812023-10-27T04:06:51Z http://sedici.unlp.edu.ar/handle/10915/159381 Photophysics of novel 22! porphyrinoids Mártire, Daniel Osvaldo Russell, Sigrid Dietrich, Hans-Jürgen Cobos, Carlos Jorge Braslavsky, Silvia E. 2012 2023-10-26T12:37:24Z en Química porphycenes porphyrins singlet molecular oxygen near-infrared emission sensitizers The photophysical properties of toluene solutions of two new 22π expanded porphycene compounds were measured using a combination of various steady-state and time-resolved techniques. The determined triplet energy (ET= 109 ± 3) kJ.mol⁻¹, coincident with the calculated ET = (96.0 ± 10) kJ.mol⁻¹, of both red absorbing compounds is higher than the energy required to excite ground state molecular oxygen to singlet molecular oxygen. However, the intersystem crossing yield is very low (ca. 10⁻²), which makes these compounds poor photosensitizers. The triplet state yield of the two expanded 22π porphyrinoid compounds is much lower than that of the parent porphycene, whereas their fluorescence is as high (ca. 30%) as the value for porphycene. The slower than diffusional quenching rate constant of a porphycene triplet state by the two new compounds reflects a steric hindering factor of the exothermic energy transfer. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 499-507 |
| institution |
Universidad Nacional de La Plata |
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I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Química porphycenes porphyrins singlet molecular oxygen near-infrared emission sensitizers |
| spellingShingle |
Química porphycenes porphyrins singlet molecular oxygen near-infrared emission sensitizers Mártire, Daniel Osvaldo Russell, Sigrid Dietrich, Hans-Jürgen Cobos, Carlos Jorge Braslavsky, Silvia E. Photophysics of novel 22! porphyrinoids |
| topic_facet |
Química porphycenes porphyrins singlet molecular oxygen near-infrared emission sensitizers |
| description |
The photophysical properties of toluene solutions of two new 22π expanded porphycene compounds were measured using a combination of various steady-state and time-resolved techniques. The determined triplet energy (ET= 109 ± 3) kJ.mol⁻¹, coincident with the calculated ET = (96.0 ± 10) kJ.mol⁻¹, of both red absorbing compounds is higher than the energy required to excite ground state molecular oxygen to singlet molecular oxygen. However, the intersystem crossing yield is very low (ca. 10⁻²), which makes these compounds poor photosensitizers. The triplet state yield of the two expanded 22π porphyrinoid compounds is much lower than that of the parent porphycene, whereas their fluorescence is as high (ca. 30%) as the value for porphycene. The slower than diffusional quenching rate constant of a porphycene triplet state by the two new compounds reflects a steric hindering factor of the exothermic energy transfer. |
| format |
Articulo Articulo |
| author |
Mártire, Daniel Osvaldo Russell, Sigrid Dietrich, Hans-Jürgen Cobos, Carlos Jorge Braslavsky, Silvia E. |
| author_facet |
Mártire, Daniel Osvaldo Russell, Sigrid Dietrich, Hans-Jürgen Cobos, Carlos Jorge Braslavsky, Silvia E. |
| author_sort |
Mártire, Daniel Osvaldo |
| title |
Photophysics of novel 22! porphyrinoids |
| title_short |
Photophysics of novel 22! porphyrinoids |
| title_full |
Photophysics of novel 22! porphyrinoids |
| title_fullStr |
Photophysics of novel 22! porphyrinoids |
| title_full_unstemmed |
Photophysics of novel 22! porphyrinoids |
| title_sort |
photophysics of novel 22! porphyrinoids |
| publishDate |
2012 |
| url |
http://sedici.unlp.edu.ar/handle/10915/159381 |
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1807221660425650176 |