Photophysics of novel 22! porphyrinoids
- Autores
- Mártire, Daniel Osvaldo; Russell, Sigrid; Dietrich, Hans-Jürgen; Cobos, Carlos Jorge; Braslavsky, Silvia E.
- Año de publicación
- 2012
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- 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 - Materia
-
Química
porphycenes
porphyrins
singlet molecular oxygen
near-infrared emission
sensitizers - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/159381
Ver los metadatos del registro completo
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Photophysics of novel 22! porphyrinoidsMártire, Daniel OsvaldoRussell, SigridDietrich, Hans-JürgenCobos, Carlos JorgeBraslavsky, Silvia E.Químicaporphycenesporphyrinssinglet molecular oxygennear-infrared emissionsensitizersThe 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 Aplicadas2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf499-507http://sedici.unlp.edu.ar/handle/10915/159381enginfo:eu-repo/semantics/altIdentifier/issn/1088-4246info:eu-repo/semantics/altIdentifier/issn/1099-1409info:eu-repo/semantics/altIdentifier/doi/10.1142/S1088424612500496info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-10T12:44:26Zoai:sedici.unlp.edu.ar:10915/159381Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-10 12:44:26.993SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
Photophysics of novel 22! porphyrinoids |
| title |
Photophysics of novel 22! porphyrinoids |
| spellingShingle |
Photophysics of novel 22! porphyrinoids Mártire, Daniel Osvaldo Química porphycenes porphyrins singlet molecular oxygen near-infrared emission sensitizers |
| 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 |
| dc.creator.none.fl_str_mv |
Mártire, Daniel Osvaldo Russell, Sigrid Dietrich, Hans-Jürgen Cobos, Carlos Jorge Braslavsky, Silvia E. |
| author |
Mártire, Daniel Osvaldo |
| author_facet |
Mártire, Daniel Osvaldo Russell, Sigrid Dietrich, Hans-Jürgen Cobos, Carlos Jorge Braslavsky, Silvia E. |
| author_role |
author |
| author2 |
Russell, Sigrid Dietrich, Hans-Jürgen Cobos, Carlos Jorge Braslavsky, Silvia E. |
| author2_role |
author author author author |
| dc.subject.none.fl_str_mv |
Química porphycenes porphyrins singlet molecular oxygen near-infrared emission sensitizers |
| topic |
Química porphycenes porphyrins singlet molecular oxygen near-infrared emission sensitizers |
| dc.description.none.fl_txt_mv |
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 |
| 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. |
| publishDate |
2012 |
| dc.date.none.fl_str_mv |
2012 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://sedici.unlp.edu.ar/handle/10915/159381 |
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http://sedici.unlp.edu.ar/handle/10915/159381 |
| dc.language.none.fl_str_mv |
eng |
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eng |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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