EPR and UV-vis spectroelectrochemical studies of diketopyrrolopyrroles disubstituted with alkylated thiophenes
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Warszawska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Synthetic Metals
ISSN
0379-6779
EISSN
Wydawca
Elsevier S.A.
DOI
Rok publikacji
2016
Numer zeszytu
Strony od-do
75-82
Numer tomu
216
Identyfikator DOI
Liczba arkuszy
0.5
Autorzy
Pozostali autorzy
+ 4
Autorzy przekładu
(liczba autorów przekładu: 0)
Słowa kluczowe
en
Diketopyrrolopyrrole derivatives; Donor-acceptor semiconductors; EPR spectroelectrochemistry; Radical anions; Radical cations; UV-vis spectroelectrochemistry; ESR spectroscopy
Streszczenia
Język
en
Treść
EPR and UV-vis spectroelectrochemical behavior of a series of ambipolar donor-acceptor-donor (DAD) compounds, consisting of a diketopyrrolopyrrole (DPP) central unit symmetrically disubstituted with mono-, bi- and terthiophene, is reported. All derivatives studied undergo a reversible reduction to radical anions at E ca. -1.55V to ca. -1.65V vs Fc/Fc+. Electrochemically generated radical anions are sufficiently stable to be detected at RT. Two-step oxidation of these compounds involves the formation of radical cations in the first step followed by their transformation into spinless dications in the second one. The formed radical cations are detectable at RT, however, contrary to the case of radical anions they yield unresolved EPR spectra. The potential of their formation depends on the length of D segment decreasing from ca. 0.50V vs Fc/Fc+ for monothiophene disubstituted DPP to ca. 0.25V in the case of the terthiophene derivative. Combining differential pulse voltammetry with EPR and UV-vis spectroelectrochemistry allows for unequivocal identification of all new, electrochemically induced UV-vis bands to particular forms of the studied molecules (radical anions, radical cations or dications). Both electrochemical reduction and electrochemical oxidation processes involve profound and distinctly different spectral changes in the visible range of the spectrum. Since they are reversible, the studied compounds can be considered as promising multicolor electrochromophores. © 2015 Elsevier Ltd.
Inne
System-identifier
WUTa7d45a7566484ed7bb839aa8702819cc
CrossrefMetadata from Crossref logo
Cytowania
Liczba prac cytujących tę pracę
Brak danych
Referencje
Liczba prac cytowanych przez tę pracę
Brak danych