scholarly journals Ultrafast photoinduced charge transport in Pt(ii) donor–acceptor assembly bearing naphthalimide electron acceptor and phenothiazine electron donor

2014 ◽  
Vol 16 (47) ◽  
pp. 25775-25788 ◽  
Author(s):  
Igor V. Sazanovich ◽  
Jonathan Best ◽  
Paul A. Scattergood ◽  
Michael Towrie ◽  
Sergei A. Tikhomirov ◽  
...  
Keyword(s):  
Charge Transport ◽  
Electron Donor ◽  
Electron Acceptor ◽  
Charge Separation ◽  
Charge Recombination ◽  
Photoinduced Charge Separation ◽  
Donor Acceptor ◽  
Photoinduced Charge

The Pt(ii)-based molecular triad engages in step-wise photoinduced charge-separation; the charge recombination occurs through-space via two distinct pathways.

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.

Axially Substituted Silicon Phthalocyanine as Electron Donor in a Dyad and Triad with Azafullerene as Electron Acceptor for Photoinduced Charge Separation

2016 ◽  
Vol 22 (42) ◽  
pp. 15137-15143 ◽  
Author(s):  
Georgios Rotas ◽  
Luis Martín-Gomis ◽  
Kei Ohkubo ◽  
Fernando Fernández-Lázaro ◽  
Shunichi Fukuzumi ◽  
...  
Keyword(s):  
Electron Donor ◽  
Electron Acceptor ◽  
Charge Separation ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge ◽  
Silicon Phthalocyanine

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.

Inter versus intra-molecular photoinduced charge separation in solid films of donor–acceptor molecules

2008 ◽  
pp. 4915 ◽  
Author(s):  
Safa Shoaee ◽  
Mattias P. Eng ◽  
Zesheng An ◽  
Xuan Zhang ◽  
Stephen Barlow ◽  
...  
Keyword(s):  
Charge Separation ◽  
Solid Films ◽  
Photoinduced Charge Separation ◽  
Donor Acceptor ◽  
Photoinduced Charge ◽  
Acceptor Molecules
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