Synthesis and Photophysical Properties of Two Dual Oligothiophene-Fullerene Linkage Molecules as Photoinduced Long-Distance Charge Separation Systems

2006 ◽  
Vol 71 (5) ◽  
pp. 1761-1768 ◽  
Author(s):  
Masashi Narutaki ◽  
Kazuo Takimiya ◽  
Tetsuo Otsubo ◽  
Yutaka Harima ◽  
Huimin Zhang ◽  
...  
Keyword(s):  
Charge Separation ◽  
Photophysical Properties ◽  
Long Distance ◽  
Separation Systems

scholarly journals Charge separation and energy transfer in multicomponent porphyrinic arrays

2001 ◽  
Vol 73 (3) ◽  
pp. 421-424 ◽  
Author(s):  
Lucia Flamigni
Keyword(s):  
Energy Transfer ◽  
Charge Separation ◽  
Photophysical Properties ◽  
Photoinduced Charge Separation ◽  
Recent Activity ◽  
Photoinduced Charge

An overview of the recent activity of the laboratory in the determination of the photophysical properties of porphyrinic arrays, with emphasis on the theme of photoinduced charge separation, is presented.

Photophysical Properties of Squaraine Derivatives:  Evidence for Charge Separation

1997 ◽  
Vol 101 (50) ◽  
pp. 9673-9677 ◽  
Author(s):  
Claudia Cornelissen-Gude ◽  
Wolfgang Rettig ◽  
René Lapouyade
Keyword(s):  
Charge Separation ◽  
Photophysical Properties

Short- and long-distance porphyrin heterodimers in bulk aqueous solution and nanowells

2004 ◽  
Vol 08 (02) ◽  
pp. 120-124 ◽  
Author(s):  
Jürgen-Hinrich Fuhrhop ◽  
Tianyu Wang ◽  
Sheshanath Bhosale ◽  
Sidhanath Bhosale
Keyword(s):  
Aqueous Solution ◽  
Charge Transfer ◽  
Fluorescence Quenching ◽  
Charge Separation ◽  
Short Distance ◽  
Molecular Complexes ◽  
Separation Process ◽  
Redox Systems ◽  
Long Distance ◽  
Acceptor Molecules

Short-distance porphyrin heterodimers may be used for very efficient titrations in water measuring fluorescence quenching in 1:1 molecular complexes between diamagnetic and paramagnetic metalloporphyrins. Radical dimers produce strong charge transfer bands near 900 nm. Long-distance heterodimers, e.g. chlorophyll-ubiquinone, play a central role in the charge separation process of biological photosynthesis. Attempts to model such dimers in form-stable nanowells are discussed and compared with corresponding molecular complexes and covalent redox systems. Heterodimers may, of course, not only be made of two porphyrins. Other acceptor molecules, which fit exactly in the nanowells, e.g. large quinones may also be applied.

scholarly journals Photophysical Properties of Donor-Acceptor Stenhouse Adducts and Their Inclusion Complexes with Cyclodextrins and Cucurbit[7]uril

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4928
Author(s):  
Liam Payne ◽  
Jason D. Josephson ◽  
R. Scott Murphy ◽  
Brian D. Wagner
Keyword(s):  
Aqueous Solution ◽  
Fluorescence Spectroscopy ◽  
Inclusion Complex ◽  
Charge Separation ◽  
Photophysical Properties ◽  
Protic Solvents ◽  
Mechanistic Insight ◽  
Donor Acceptor ◽  
Strong Inclusion ◽  
Supramolecular Complexation

Donor-acceptor Stenhouse adducts (DASAs) are a novel class of solvatochromic photoswitches with increasing importance in photochemistry. Known for their reversibility between open triene and closed cyclized states, these push-pull molecules are applicable in a suite of light-controlled applications. Recent works have sought to understand the DASA photoswitching mechanism and reactive state, as DASAs are vulnerable to irreversible “dark switching” in polar protic solvents. Despite the utility of fluorescence spectroscopy for providing information regarding the electronic structure of organic compounds and gaining mechanistic insight, there have been few studies of DASA fluorescence. Herein, we characterize various photophysical properties of two common DASAs based on Meldrum’s acid and dimethylbarbituric acid by fluorescence spectroscopy. This approach is applied in tandem with complexation by cyclodextrins and cucurbiturils to reveal the zwitterionic charge separation of these photoswitches in aqueous solution and the protective nature of supramolecular complexation against degradative dark switching. DASA-M, for example, was found to form a weak host-guest inclusion complex with (2-hydroxypropyl)-γ-cyclodextrin, with a binding constant K = 60 M−1, but a very strong inclusion complex with cucurbit[7]uril, with K = 27,000 M−1. This complexation within the host cavity was found to increase the half-life of both DASAs in aqueous solution, indicating the significant and potentially useful stabilization of these DASAs by host encapsulation.

Synthesis and comparative charge transfer studies in porphyrin–fullerene dyads: mode of attachment effect

2017 ◽  
Vol 41 (22) ◽  
pp. 13276-13286 ◽  
Author(s):  
Neha Gupta ◽  
Chhavi Sharma ◽  
Mahesh Kumar ◽  
Rachana Kumar
Keyword(s):  
Electrical Conductivity ◽  
Charge Transfer ◽  
Charge Separation ◽  
Photophysical Properties ◽  
Electronic Devices ◽  
Potential Candidate ◽  
Organic Electronic Devices ◽  
Organic Electronic ◽  
Thermally Activated ◽  
Mode Of Attachment

Two types of dyads having different modes of attachment i.e. cyclopropanation vs. pyrrolidine type in porphyrin–fullerene linked systems are compared for their photophysical properties. Dyad II with pyrrolidine type of linkage shows faster charge separation and generation of long lived charge separated states. It also shows a new property of thermally activated electrical conductivity which makes it potential candidate for organic electronic devices.

Photodecomposition of H2S to H2 over Cu2+ Doped Cd0.3In2S4-Zn0.7In2S4 Composite Photocatalysts

2012 ◽  
Vol 486 ◽  
pp. 174-180
Author(s):  
Xue Feng Bai ◽  
Wen Yan Shan
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Charge Separation ◽  
Separation Efficiency ◽  
Photophysical Properties ◽  
H2 Evolution ◽  
Composite Photocatalyst ◽  
Long Wavelength ◽  
Composite Photocatalysts ◽  
Charge Separation Efficiency

The Cd0.3In2S4-Zn0.7In2S4 composite photocatalyst doped with transition metal Cu2+ has been synthesized by hydrothermal method. The physical and photophysical properties of the above-prepared photocatalysts were characterized by XRD, UV-Vis, SPS, SEM and XPS. The XRD peaks of Cu2+ doped Cd0.3In2S4-Zn0.7In2S4 were almost the same as the crystal structure of Cd0.3In2S4-Zn0.7In2S4. The UV-Vis absorption edge of Cu2+ doped Cd0.3In2S4-Zn0.7In2S4 shifted monotonically to long wavelength. The photocatalytic activity of Cu2+ doped photocatalysts had been improved as a result of the enhancement of the charge separation efficiency. The results indicated that the photocatalyst of Cu2+(2wt %)-Cd0.3In2S4/Zn0.7In2S4 exhibited the highest photocatalytic activity with the rate of H2 evolution to be 1141 μmol/(h·g) under visible light irradiation.

Intramolecular charge separation and recombination in non-polar environments via long-distance electron transfer through saturated hydrocarbon barriers

1993 ◽  
Vol 170 (3) ◽  
pp. 359-380 ◽  
Author(s):  
John M. Warman ◽  
Kenneth J. Smit ◽  
Stephan A. Jonker ◽  
Jan W. Verhoeven ◽  
Henk Oevering ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Charge Separation ◽  
Saturated Hydrocarbon ◽  
Long Distance
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