Abstract：
:Absorption and relaxation dynamics of electronic states of free-base, Co(II), Cu(II) and Zn(II) porphyrins bearing a β-(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.
journal_name
Spectrochim Acta A Mol Biomol Spectroscauthors
Sciuti LF,Costa LD,Guieu S,Cocca LHZ,Iglesias BA,Mendonça CR,Tomé AC,Faustino MAF,De Boni Ldoi
10.1016/j.saa.2021.119911keywords:
["Absorption dynamics","BF(2) substitution","Intersystem crossing","Lifetime","Metalloporphyrins","Porphyrins","Relaxation dynamics","Time-resolved spectroscopic techniques","Transient absorption technique"]subject
Has Abstractpub_date
2021-11-05 00:00:00pages
119911eissn
1386-1425issn
1873-3557pii
S1386-1425(21)00487-Xjournal_volume
260pub_type
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