A zinc phthalocyanine–benzoperylenetriimide conjugate for solvent dependent ultrafast energy vs. electron transfer

2019 ◽  
Vol 55 (99) ◽  
pp. 14946-14949 ◽  
Author(s):  
Valeria Navarro-Pérez ◽  
Ana M. Gutiérrez-Vílchez ◽  
Javier Ortiz ◽  
Ángela Sastre-Santos ◽  
Fernando Fernández-Lázaro ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Transient Absorption ◽  
Solvent Polarity ◽  
Zinc Phthalocyanine ◽  
Femtosecond Transient Absorption ◽  
Energy And Electron Transfer ◽  
Absorption Technique

Ultrafast energy and electron transfer as a function of solvent polarity has been demonstrated using a femtosecond transient absorption technique in a zinc phthalocyanine–benzoperylenetriimide conjugate.

Photoinduced electron transfer dynamics in dye-sensitized ZnO nanowire photoanodes

2018 ◽  
Vol 32 (19) ◽  
pp. 1840049
Author(s):  
Akihiro Furube ◽  
Takahiro Arai ◽  
Masahiro Okazaki ◽  
Shinichiro Yanagiya ◽  
Liang-Yih Chen ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Transient Absorption ◽  
Low Cost ◽  
Transient Absorption Spectroscopy ◽  
Zno Nanowire ◽  
Dye Sensitized ◽  
Femtosecond Transient Absorption ◽  
State Formula ◽  
Flexible Solar Cell

A photoanode using dye-sensitized ZnO nanowire (NW) is a good candidate for low-cost, colorful, light-weight and flexible solar cell material. We have synthesized a ZnO NW anode and a ZnO nanowire–nanoparticle (NWNP) anode, in which ZnO nanoparticles (NPs) are decollated on the surface of NWs. Photo-induced electron transfer dynamics from the excited state of sensitizer dye (D149) to the conduction band of ZnO NW and ZnO NWNP was clarified using femtosecond transient absorption spectroscopy. The decay of the single excited state ([Formula: see text]) of D149 was faster in ZnO NW than that of ZnO NWNP, indicating that NW is more suitable as an efficient electron acceptor.

Efficient photoinduced electron transfer between C60/C70 and zinc octaethylporphyrin studied by nanosecond laser photolysis method

2000 ◽  
Vol 04 (06) ◽  
pp. 591-598 ◽  
Author(s):  
MOHAMED E. EL-KHOULY ◽  
MAMORU FUJITSUKA ◽  
OSAMU ITO
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Photoinduced Electron Transfer ◽  
Transfer Rate ◽  
Transient Absorption ◽  
Laser Light ◽  
Solvent Polarity ◽  
Nanosecond Laser ◽  
Electron Transfer Rate ◽  
Absorption Bands

Photoinduced electron-transfer processes between C 60 or C 70 and zinc octaethylporphyrin ( ZnOEP ) have been studied in polar solvents with the nanosecond laser flash photolysis method, observing the transient absorption spectra in the visible and near-IR regions. By the predominant excitation of ZnOEP with 532 nm laser light the transient absorption bands of 3 ZnOEP * decayed, accompanied by the appearance of the transient absorption bands of [Formula: see text] and [Formula: see text]. By the predominant excitation of C 60 and C 70 with 610 nm laser light the decays of [Formula: see text] and [Formula: see text] were observed, accompanied by the appearance of [Formula: see text] and [Formula: see text]. The electron transfer rate constants (k et ) and the quantum yields (Φ et ) of [Formula: see text] and [Formula: see text] formation via 3 ZnOEP * and [Formula: see text] or [Formula: see text] have been evaluated. These values increase with the solvent polarity; in polar benzonitrile these values are higher than for other porphyrins such as zinc tetraphenylporphyrin. The back electron transfer rate constants were evaluated from the decays of [Formula: see text] and [Formula: see text], which also show a solvent polarity dependence.

scholarly journals Solvent-dependent photo-induced dynamics in a non-rigidly linked zinc phthalocyanine–perylenediimide dyad probed using ultrafast spectroscopy

2017 ◽  
Vol 19 (31) ◽  
pp. 21078-21089 ◽  
Author(s):  
Bryan Kudisch ◽  
Margherita Maiuri ◽  
Vicente M. Blas-Ferrando ◽  
Javier Ortiz ◽  
Ángela Sastre-Santos ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Dynamic System ◽  
Ultrafast Spectroscopy ◽  
Light Harvesting ◽  
Zinc Phthalocyanine ◽  
Artificial Light ◽  
Pump Probe ◽  
Energy And Electron Transfer

A solvent dependent pump–probe study on an artificial light harvesting dyad reveals static and dynamic system-bath interactions observed in ultrafast photoinduced energy and electron transfer.

Femtosecond Transient Absorption and Nonlinear Optical Studies of a Novel Zinc Phthalocyanine

2019 ◽  
Author(s):  
Somdatta Bhattacharya ◽  
Chinmoy Biswas ◽  
Sai Santosh Kumar Raavi ◽  
Giribabu Lingamallu ◽  
Venugopal Rao Soma
Keyword(s):  
Nonlinear Optical ◽  
Transient Absorption ◽  
Zinc Phthalocyanine ◽  
Optical Studies ◽  
Femtosecond Transient Absorption

Real-time observation of ultrafast electron injection at graphene–Zn porphyrin interfaces

2015 ◽  
Vol 17 (14) ◽  
pp. 9015-9019 ◽  
Author(s):  
Dilshad Masih ◽  
Shawkat M. Aly ◽  
Anwar Usman ◽  
Erkki Alarousu ◽  
Omar F. Mohammed
Keyword(s):  
Electron Transfer ◽  
Real Time ◽  
Absorption Spectra ◽  
Transient Absorption ◽  
Ion Pairs ◽  
Electron Injection ◽  
Transient Absorption Spectra ◽  
Femtosecond Transient Absorption ◽  
Time Observation ◽  
Real Time Observation

Femtosecond transient absorption spectra of zinc(ii) porphyrin in the presence of graphene carboxylate (GC) reveal ultrafast electron transfer from the singlet excited ZnTMPyP* to GC, forming ZnTMPyP˙+ and GC˙− radical ion pairs.

Synthesis and photophysical studies of a low-symmetry tribenzoisothiazoloporphyrazine

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1090-1097
Author(s):  
Desiré Molina ◽  
Mohamed E. El-Khouly ◽  
Savvas Ioannou ◽  
Andreas S. Kalogirou ◽  
Panayiotis A. Koutentis ◽  
...  
Keyword(s):  
Transient Absorption ◽  
High Resolution Mass Spectrometry ◽  
Molecular Orbital Calculation ◽  
Zinc Phthalocyanine ◽  
H Nmr ◽  
Femtosecond Transient Absorption ◽  
Photophysical Behavior ◽  
Photophysical Studies ◽  
Steady State Absorption ◽  
Low Symmetry

A new low-symmetry tetraazaporphyrin has been synthesized and characterized by 1H NMR, electronic spectroscopies and high resolution mass spectrometry. The photophysical behavior of the newly synthesized low-symmetry zinc tetraazaporphyrin ZnPz 1 has been examined and compared with that of the symmetrical tert-octylphenoxy zinc phthalocyanine ZnPc 2, by using steady-state absorption and fluorescence, cyclic voltammetry, molecular orbital calculation, and femtosecond transient absorption techniques.

Excited state electron transfer in A2 and A2B2 functionalized zinc porphyrins carrying rigid and flexible β-pyrrole π-extended substituents

2020 ◽  
Vol 24 (05n07) ◽  
pp. 904-919
Author(s):  
Michael B. Thomas ◽  
Siddhartha Kumar ◽  
Timothy Esquivel ◽  
Hong Wang ◽  
Francis D’Souza
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Transient Absorption ◽  
Binding Constants ◽  
Free Energy Calculations ◽  
Stable Complex ◽  
State Electron ◽  
Femtosecond Transient Absorption ◽  
Absorption Studies ◽  
Zinc Porphyrins

Optical absorption and emission, electrochemical, and photochemical properties of peripherally functionalized with flexible and rigid [Formula: see text]-extended substituents on A2 and A2B2 type zinc porphyrins is investigated. The significance of rigid [Formula: see text]-substituents over flexible ones in governing the spectral properties is unraveled. Flexible [Formula: see text]-substituents on the porphyrin ring caused appreciable spectral broadening compared to porphyrin carrying rigid [Formula: see text]-substituents. Further, supramolecular dyads are formed by coordinating phenyl imidazole functionalized fullerene, C[Formula: see text]Im. The calculated binding constants for the 1:1 complexes is in the order of 2–7 × 105 M[Formula: see text] suggesting stable complex formation. Free-energy calculations performed according to the Rehm–Weller approach suggested possibility of excited state electron transfer in these dyads. Femtosecond transient absorption studies of the dyads performed in [Formula: see text]-dichlorobenzene showed evidence of occurrence of electron transfer from the singlet-excited state that was in competition with the intersystem crossing process to populate the triplet-excited state of porphyrins.

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.

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