Picosecond time-resolved observation of photoinduced charge separation from the singlet excited state of porphyrin-quinone model systems

1981 ◽  
Vol 84 (2) ◽  
pp. 263-266 ◽  
Author(s):  
Masahito Migita ◽  
Tadashi Okada ◽  
Noboru Magata ◽  
Shinji Nishitani ◽  
Nobuyuki Kurata ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Separation ◽  
Model Systems ◽  
Singlet Excited State ◽  
Time Resolved ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

Linking optical spectra to free charges in donor/acceptor heterojunctions: cross-correlation of transient microwave and optical spectroscopy

2021 ◽  
Author(s):  
Hyun Suk Kang ◽  
Samuel Peurifoy ◽  
Boyuan Zhang ◽  
Andrew J. Ferguson ◽  
Obadiah G. Reid ◽  
...  
Keyword(s):  
Optical Spectroscopy ◽  
Charge Separation ◽  
Cross Correlation ◽  
Optical Spectra ◽  
Time Resolved ◽  
Near Ir ◽  
Photoinduced Charge Separation ◽  
Donor Acceptor ◽  
Photoinduced Charge

Quantitative cross-correlation of time-resolved spectroscopies in the visible/near-IR and microwave regions provides deeper understanding of photoinduced charge separation across donor/acceptor heterojunctions than either technique alone.

scholarly journals Sc3N@Ih-C80 based donor–acceptor conjugate: role of thiophene spacer in promoting ultrafast excited state charge separation

RSC Advances ◽  
2020 ◽  
Vol 10 (34) ◽  
pp. 19861-19866
Author(s):  
Rubén Caballero ◽  
Luis David Servián ◽  
Habtom B. Gobeze ◽  
Olivia Fernandez-Delgado ◽  
Luis Echegoyen ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Separation ◽  
Charge Recombination ◽  
Photoinduced Charge Separation ◽  
Donor Acceptor ◽  
Photoinduced Charge ◽  
State Charge

Photoinduced charge separation and dark charge recombination occurring within picoseconds is observed in newly synthesized triphenylamine–thiophene-Sc3N@Ih-C80 and triphenylamine–thiophene-C60 conjugates.

Photoinduced charge separation in a PtII acetylide donor–acceptor triad based on 2-(1-pyrazole)-pyridine modified with naphthalene mono-imide electron acceptor

2013 ◽  
Vol 85 (7) ◽  
pp. 1331-1348 ◽  
Author(s):  
Igor V. Sazanovich ◽  
Mohammed A. H. Alamiry ◽  
Anthony J. H. M. Meijer ◽  
Michael Towrie ◽  
E. Stephen Davies ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Electron Acceptor ◽  
Charge Separation ◽  
Transient Absorption ◽  
Initial Population ◽  
Large Shift ◽  
Photoinduced Charge Separation ◽  
Donor Acceptor ◽  
Photoinduced Charge

A class of molecular electron transfer cascades—those based on PtII complexes of 2-(1-pyrazole)-pyridine (pzpy) ligands—are reported. The synthesis of a new electron-acceptor imide-modified pzpy ligands is reported, and their application to transition-metal chemistry demonstrated by the synthesis of the PtII chloride and acetylide complexes. These donor–acceptor assemblies are promising models for investigation of photoinduced charge separation. Accordingly, picosecond time-resolved infrared (TRIR) and femtosecond transient absorption (TA) studies have been undertaken to elucidate the nature and dynamics of the lowest excited states in Pt(NAP-pyr-pyrazole)(–CC–Ph–C7H15)2. It has been established that the initial population of an MLL'CT excited state in the chromophoric [Pt(pyridine-pyrazole)(acetylide)] core is followed by an electron transfer to the naphthalimide (NAP) acceptor, forming a charge-separated state. This state is characterized by a large shift in ν(CO) vibrations of the NAP acceptor, as well as by a very intense and broad [×10 times in comparison to ν(CO)] asymmetric acetylide stretch which incorporates –CC–Pt–CC– framework and occurs at approximately 300 cm–1 lower in energy than its ground-state counterpart. In CH2Cl2 at room temperature, the charge-separated state with the lifetime of 150 ps collapses into an almost isoenergetic NAP-localized triplet state; the rate of this transformation changes upon decreasing the temperature to 263 K. This final excited state, 3NAP-(pyr-pyrazole)Pt(–CC–Ph–C7H15)2, has an unusually long, for PtII complexes, excited-state lifetime of tens of microseconds. The work demonstrates the possibility of tuning excited-state properties in this new class of PtII chromophores designed for electron-transfer cascades.

Anionic Fluorinated Zn-porphyrin Combined with Cationic Endohedral Li-fullerene for Long-Lived Photoinduced Charge Separation with Low Energy Loss

2021 ◽  
Vol 125 (3) ◽  
pp. 918-925
Author(s):  
Kazuhira Miwa ◽  
Shinobu Aoyagi ◽  
Takahiro Sasamori ◽  
Hiroshi Ueno ◽  
Hiroshi Okada ◽  
...  
Keyword(s):  
Energy Loss ◽  
Charge Separation ◽  
Low Energy ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

Photoinduced charge separation in microporous and mesoporous materials

2011 ◽  
Vol 89 (3) ◽  
pp. 257-265 ◽  
Author(s):  
Ranjit T. Koodali
Keyword(s):  
Mesoporous Materials ◽  
Charge Separation ◽  
Organic Molecules ◽  
Microporous Materials ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge ◽  
Mcm 41

A review of photoinduced charge separation of organic molecules in microporous and mesoporous materials is presented. In particular, the photoionization of N-alkylphenothiazine (PCn), N,N,N′,N′-tetramethylbenzidine (TMB), and porphyrin in microporous materials, such as zeolites, aluminophosphates (AlPOs), silicoaluminophosphates (SAPOs), and mesoporous materials, such as MCM-41, MCM-48, and SBA-15, is discussed.

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