authors |
Sciuti, LF; Costa, LD; Guieu, S; Cocca, LHZ; Iglesias, BA; Mendonca, CR; Tome, AC; Faustino, MAF; De Boni, L |
nationality |
International |
journal |
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY |
author keywords |
Metalloporphyrins; Porphyrins; Transient absorption technique; Time-resolved spectroscopic techniques; Absorption dynamics; Relaxation dynamics; Lifetime; Intersystem crossing |
keywords |
NONLINEAR ABSORPTION; ZINC PORPHYRIN; QUANTUM YIELD; COMPLEXES; SPECTRA; CO |
abstract |
Absorption and relaxation dynamics of electronic states of free-base, Co(II), Cu(II) and Zn(II) porphyrins bearing a b-(2,2-difluoro-1,3,2-dioxaborinin-5-yl) group were investigated in dimethyl sulfoxide by using distinct time-resolved spectroscopic techniques. Furthermore, excited state absorption cross-section spectra were determined by combining white light continuum Z-Scan and transient absorption techniques. In the case of the free-base (2H) and Zn(II) porphyrins, we were able to quantify singlet-triplet conversion by analyzing the evolution of time-resolved fluorescence. Relaxation lifetimes from the excited to the ground state were observed in both porphyrins at nanosecond time scale. However, for Co(II) and Cu(II) metalloporphyrins it was observed in the picosecond time scale through femtosecond transient absorption, indicating that both compounds relax back to the ground state only by internal conversion processes. Co(II) and Cu(II) heavy atoms seem to prohibit the radiative and intersystem crossing processes. (c) 2021 Elsevier B.V. All rights reserved. |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
issn |
1386-1425 |
isbn |
1873-3557 |
year published |
2021 |
volume |
260 |
digital object identifier (doi) |
10.1016/j.saa.2021.119911 |
web of science category |
9 |
subject category |
Spectroscopy |
unique article identifier |
WOS:000670125800022
|
ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
3.232 |
5 year journal impact factor |
2.848 |
category normalized journal impact factor percentile |
84.524 |
dimensions (citation analysis):
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altmetrics (social interaction):
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