Light harvesting a gold porphyrin–zinc phthalocyanine supramolecular donor–acceptor dyad

2016 ◽  
Vol 15 (11) ◽  
pp. 1340-1346 ◽  
Author(s):  
Mohamed E. El-Khouly ◽  
Shunichi Fukuzumi
Keyword(s):  
Electron Transfer ◽  
Electron Acceptor ◽  
Transfer Process ◽  
Photosynthetic Reaction Center ◽  
Good Combination ◽  
Zinc Phthalocyanine ◽  
Electron Transfer Process ◽  
Axial Coordination ◽  
Reaction Center Complex ◽  
Donor Acceptor

Good combination! Axial coordination of gold porphyrin, as an electron acceptor, with zinc phthalocyanine, as an electron donor, results in the formation of a novel supramolecular dyad which can mimic the efficient electron transfer process of a photosynthetic reaction center complex.

scholarly journals Two-electron transfer stabilized by excited-state aromatization

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Jinseok Kim ◽  
Juwon Oh ◽  
Seongchul Park ◽  
Jose L. Zafra ◽  
Justin R. DeFrancisco ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Excited States ◽  
Transfer Process ◽  
Comprehensive Understanding ◽  
Electron Transfer Process ◽  
Photoactive Materials ◽  
Donor Acceptor ◽  
Scientific Significance

Abstract The scientific significance of excited-state aromaticity concerns with the elucidation of processes and properties in the excited states. Here, we focus on TMTQ, an oligomer composed of a central 1,6-methano[10]annulene and 5-dicyanomethyl-thiophene peripheries (acceptor-donor-acceptor system), and investigate a two-electron transfer process dominantly stabilized by an aromatization in the low-energy lying excited state. Our spectroscopic measurements quantitatively observe the shift of two π-electrons between donor and acceptors. It is revealed that this two-electron transfer process accompanies the excited-state aromatization, producing a Baird aromatic 8π core annulene in TMTQ. Biradical character on each terminal dicyanomethylene group of TMTQ allows a pseudo triplet-like configuration on the 8π core annulene with multiexcitonic nature, which stabilizes the energetically unfavorable two-charge separated state by the formation of Baird aromatic core annulene. This finding provides a comprehensive understanding of the role of excited-state aromaticity and insight to designing functional photoactive materials.

scholarly journals Electron transfer by singlet excited state of porphyn and electron acceptor affinity in rigid medium: photoacoustic phase angle analysis

1997 ◽  
Vol 22 (0) ◽  
pp. 83-92
Author(s):  
Marinônio Lopes CORNÉLIO
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Phase Behavior ◽  
Electron Acceptor ◽  
Transfer Process ◽  
Spectral Region ◽  
Optical Excitation ◽  
Singlet Excited State ◽  
Electron Transfer Process ◽  
Excitation Process

Photoacoustic spectroscopy provides information about both amplitude and phase of the response of a system to an optical excitation process. This paper presents the studies of the phase in the electron transfer process between octaethylporphyn (OEP) and quinone molecules dispersed in a polymeric matrix. It was observed a tendency in the phase behavior to small values only in the spectral region near to 620 nm, while for shorter wavelength did not show any tendency. These measurements suggested that the electron transfer to acceptor occurred with the participation of octaethylporphyn singlet excited state.

scholarly journals Multistep energy and electron transfer processes in novel rotaxane donor–acceptor hybrids generating microsecond-lived charge separated states

2015 ◽  
Vol 6 (12) ◽  
pp. 7293-7304 ◽  
Author(s):  
Sabrina V. Kirner ◽  
Christian Henkel ◽  
Dirk M. Guldi ◽  
Jackson D. Megiatto Jr ◽  
David I. Schuster
Keyword(s):  
Electron Transfer ◽  
Electron Acceptor ◽  
Zinc Phthalocyanine ◽  
Zinc Porphyrin ◽  
Transfer Processes ◽  
Energy And Electron Transfer ◽  
Donor Acceptor ◽  
Electron Transfer Processes

A new set of [Cu(phen)2]+ based rotaxanes, featuring [60]-fullerene as an electron acceptor and a variety of electron donating moieties, namely zinc porphyrin (ZnP), zinc phthalocyanine (ZnPc) and ferrocene (Fc), has been synthesized and fully characterized.

scholarly journals Taming C60fullerene: tuning intramolecular photoinduced electron transfer process with subphthalocyanines

2015 ◽  
Vol 6 (7) ◽  
pp. 4141-4147 ◽  
Author(s):  
Marc Rudolf ◽  
Olga Trukhina ◽  
Josefina Perles ◽  
Lai Feng ◽  
Takeshi Akasaka ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electron Donor ◽  
Transfer Process ◽  
Photoinduced Electron Transfer ◽  
Electron Transfer Process ◽  
Donor Acceptor

Two subphthalocyanine–C60fullerene electron donor–acceptor conjugates have been prepared from electron deficient subphthalocyanines and C60, with evidence of an ultrafast oxidative electron transfer from C60to the subphthalocyanines.

scholarly journals Spectroscopic and Morphological Studies of Metal-Organic and Metal-Free Dyes onto Titania Films for Dye-Sensitized Solar Cells

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Gabriella Di Carlo ◽  
Daniela Caschera ◽  
Roberta G. Toro ◽  
Cristina Riccucci ◽  
Gabriel M. Ingo ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Transfer Process ◽  
Ruthenium Complex ◽  
Dye Sensitized Solar Cells ◽  
Fluorescence Emission ◽  
Zinc Phthalocyanine ◽  
Electron Transfer Process ◽  
Doctor Blade ◽  
Morphological Studies ◽  
Titania Films

We have investigated the spectroscopic behavior of three different sensitizers adsorbed onto titania thin films in order to gain information both on the electron transfer process from dye to titania and on the anchorage of the chromophore onto the semiconductor. We have examined by UV-Vis and fluorescence spectroscopy the widely used ruthenium complexcis-di(thiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylato)ruthenium(II) (N719), the more recently developed organic molecular 3-(5-(4-(diphenylamino)styryl)thiophen-2-yl)-2-cyanoacrylic acid (D5), and apush-pullzinc phthalocyanine sensitizer (ZnPc). Three type of titania films with different morphology, characterized by SEM and FT-IR measurement, were considered: a mesoporous transparent film deposited by spin-coating (TiMS), a semiopaque film deposited by doctor-blade from mesoporous titania (TiMS_DB) and a semiopaque film deposited by doctor-blade form commercial P25 titania (P25_DB). The use of TiMS is responsible for the adsorption of a higher amount of dye since the mesoporous structure allows increasing the interfacial area between dye and titania. Moreover, the fluorescence emission peak is weaker when the sensitizers are adsorbed onto TiMS. These findings suggest that mesostructured films could be considered the most promising substrates to realize photoanodes with a fast electron transfer process.

Sign in / Sign up

Export Citation Format

Share Document