Comparative Charge Transfer Studies of Porphyrin-Fullerene Dyads: Substituents Effect

2020 ◽  
Vol 20 (6) ◽  
pp. 3437-3447 ◽  
Author(s):  
Neha Gupta ◽  
Samya Naqvi ◽  
Nikita Vasistha ◽  
Mahesh Kumar ◽  
Rachana Kumar
Keyword(s):  
Charge Transfer ◽  
Transient Absorption ◽  
Separation Efficiency ◽  
Photophysical Properties ◽  
Conductivity Measurement ◽  
Transient Absorption Spectroscopy ◽  
Electrical Conductivity Measurement ◽  
Conductivity Enhancement ◽  
Quenching Efficiency ◽  
Electron Donating Groups

The present study deals with the study of charge transfer and photophysical properties of synthesized non-metallated fullerene-porphyrin dyad-III (H2P3-C60) via Prato reaction. The porphyrin has been substituted with electron donating groups (3,5-di-tert-butylbenzene) at meso positions facilitating the effective charge transfer for the formation of long lived charge-separated states in dyad molecule. The photophysical and thermal activated conducting properties of dyad was comprehensively studied to establish the effect of substituents and also by comparing with our reported dyad II having only meso-phenyl groups. The charge separation efficiency in dyad III has been calculated in solution as well as in films showing 62% and ˜99% quenching efficiency respectively suggesting faster photoinduced charge transfer from porphyrin to fullerene moiety. Transient absorption spectroscopy (TAS) showed formation of longer lived charge separated states in solution as well as in films compared to dyad-II. The thermal activated electrical conductivity measurement of dyad-III showed conductivity enhancement on increasing temperature. The activation energy for conduction was also found lower than dyad-II suggesting a substantial effect of electron-donating groups present on porphyrin ring in conducting behavior of dyad-III. Through this study with a very simple dyad structure we established that the presence of electron donating groups in dayds, highly influence photophysical and electronic properties. This special characteristic further makes them potential material to be used in various opto-electronic applications.

Metal-to-Ligand Charge Transfer Excited States in π-Conjugated Systems

2001 ◽  
Vol 665 ◽  
Author(s):  
Yiting Li ◽  
C. Ed Whittle ◽  
Keith A. Walters ◽  
Kevin D. Ley ◽  
Kirk S. Schanze
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Excited States ◽  
Transition Metal Complexes ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Transient Absorption Spectroscopy ◽  
Conjugated Oligomers ◽  
Conjugated Systems ◽  
Ligand Charge Transfer

ABSTRACTThis paper overviews recent work that examined the optical properties of mono-disperse, PPE-based π-conjugated oligomers that contain a 2,2-bipyridine-5,5'-diyl metal coordinating unit. The photophysical properties of the free oligomers and metallated oligomers that contain the -Ru(bpy)22+ and -Re(CO)3Cl transition metal complexes coordinated to the bpy-diyl unit have been characterized by absorption, photoluminescence and transient absorption spectroscopy. In addition, we report the photophysics of a novel organometallic “square” that features “sides” consisting of a PPE-type π-conjugated oligomer and “corners” that consist of (dbubpy)PtII(acetylide)2 units (where dbubpy = 4,4'-di-tert-butyl-2,2'-bipyridine).

Charge-Transfer Dynamics at Ag/Ni-MOF/Cu2O heterostructure in Photoelectrochemical NH3 production

2021 ◽  
Author(s):  
Ying Liu ◽  
Jianmin Lu ◽  
Qianxiao Zhang ◽  
Yajie Bai ◽  
Xuliang Pang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Yield Rate ◽  
Ultrafast Transient Absorption ◽  
Charge Transfer Dynamics ◽  
Ultrafast Transient Absorption Spectroscopy

Decoration of Ag-ultrathin Ni-MOF onside Cu2O was firstly fabricated. The charge-transfer dynamics at heterostructure was in-depth revealed by ultrafast transient absorption spectroscopy. NH3 yield rate (4.63 μg h-1 cm-2) with...

Bulbous gold–carbon nanodot hybrid nanoclusters for cancer therapy

2017 ◽  
Vol 5 (43) ◽  
pp. 8591-8599 ◽  
Author(s):  
Dominik H. Hasenöhrl ◽  
Avishek Saha ◽  
Volker Strauss ◽  
Leonie Wibmer ◽  
Stefanie Klein ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Cancer Therapy ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Gold Nanoclusters ◽  
Transient Absorption Spectroscopy ◽  
Carbon Nanodots

Carbon nanodots are used to stabilize gold-nanoclusters. Charge-transfer interactions between carbon nanodots and gold were detected by transient absorption spectroscopy.

Synthesis, characterization and photophysical properties of ferrocenyl and mixed sandwich cobaltocenyl ester linked meso-triaryl corrole dyads

2017 ◽  
Vol 21 (10) ◽  
pp. 646-657 ◽  
Author(s):  
B. Shivaprasad Achary ◽  
A. R. Ramya ◽  
Rajiv Trivedi ◽  
P. R. Bangal ◽  
L. Giribabu
Keyword(s):  
Transient Absorption ◽  
Photophysical Properties ◽  
Heavy Atom ◽  
Parent Compound ◽  
Fluorescence Emission ◽  
Soret Band ◽  
Transient Absorption Spectroscopy ◽  
Ferrocene Derivatives ◽  
Time Resolved ◽  
Design And Synthesis

We report here the design and synthesis of corrole-metallocene dyads consisting of a metallocene (either ferrocene (Dyad 1) or mixed sandwich [Formula: see text]-[C[Formula: see text]H[Formula: see text](COOH)]Co([Formula: see text]-C[Formula: see text]Ph[Formula: see text] (Dyad 2)) connected via an ester linkage at meso phenyl position. Both the dyads were characterized by [Formula: see text]H NMR, MALDI-TOF, UV-visible, fluorescence spectroscopies (steady-state, picosecond time-resolved), femtosecond transient absorption spectroscopy (fs-TA) and electrochemical methods. The absorption spectra of these dyads showed slight broadening and splitting of the Soret band that indicates a weak ground state interaction between the corrole macrocycle and metallocene part of the present donor–acceptor (D–A) system. However, in both the dyad systems, fluorescence emission of the corrole was quenched in polar solvents as compared to its parent compound 10-(4-hydroxyphenyl)-5,15-bis-(pentafluorophenyl ) corrole (Ph-Corr). The quenching was more pronounced in ferrocene derivatives than in cobaltocenyl derivatives. Transient absorption studies confirm the absence of photoinduced electron transfer from metallocene to correl for these dyad systems and the quenching of singlet state of corrole is found to enhance intersystem crossing due to heavy atom effect.

scholarly journals Identification of different pathways of electron injection in dye-sensitised solar cells of electrodeposited ZnO using an indoline sensitiser

2016 ◽  
Vol 18 (13) ◽  
pp. 8938-8944 ◽  
Author(s):  
Iulia Minda ◽  
Essraa Ahmed ◽  
Vivien Sleziona ◽  
Christoph Richter ◽  
Max Beu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Electron Injection ◽  
Transient Absorption Spectroscopy ◽  
Ultrafast Transient Absorption ◽  
Charge Transfer Dynamics ◽  
Ultrafast Transient Absorption Spectroscopy

Charge transfer dynamics in fully operational dye sensitised solar cells as observed using ultrafast transient absorption spectroscopy.

Sign in / Sign up

Export Citation Format

Share Document