Dependent excited state absorption and dynamic of b-BF2 substituted metalloporphyrins: The metal ion effect
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
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