Photo-induced intramolecular electron transfer in phenoxazine-phthalocyanine donor-acceptor systems

Srivishnu, K. S.; Naresh, Madarapu; Rao, J. Laxmikanth; Giribabu, Lingamallu

doi:10.1142/s1088424622500080

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…aSolvent: CH 2 Cl 2 , error limits: λ max , ±1 nm, log ε , ±10%.bSolvent: CH 2 Cl 2 , error limits: λ ex , ±2 nm; ϕ , ±10%; quantum yields were measured with reference to tert -butyl phthalocyanine. 34 cError limits of τ ∼ 10%, values in the parentheses are relative amplitudes of the corresponding decay components.d E 0–0 was determined from the intersection of normalized absorption and emission spectra.eThe oxidation potentials of dyes were measured in THF with 0.1 M tetrabutylammoniumhexafluorophosphate (TBAPF6) with a scan rate of 50 mV s −1 ( vs . NHE).fError limits: ±0.1 V.g was determined as E OX − E 0–0 .…”

Section: Resultsmentioning

confidence: 99%

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Novel phosphorus(v) tetrabenzotriazacorroles: synthesis, characterization, optical, electrochemical, and femtosecond nonlinear optical studies

et al. 2022

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Section: Resultsmentioning

confidence: 99%

“…bSolvent: CH 2 Cl 2 , error limits: λ ex , ±2 nm; ϕ , ±10%; quantum yields were measured with reference to tert -butyl phthalocyanine. 34 …”

Section: Resultsmentioning

confidence: 99%

Novel phosphorus(v) tetrabenzotriazacorroles: synthesis, characterization, optical, electrochemical, and femtosecond nonlinear optical studies

et al. 2022

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Light-induced energy and electron transfer occurring in tandem in tetra (bis(4′-tert-butylbiphenyl-4-yl)aniline)-zinc(II) porphyrin-fullerene supramolecular conjugates

Gangada¹,

Jain²,

Anjaiah³

et al. 2022

J. Porphyrins Phthalocyanines

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[Formula: see text]-bis (4′-tert-butylbiphenyl-4-yl)aniline) tethered zinc porphyrins, (BBA)4- ZnP, (BBA- Ph)4- ZnP, and (BBA- OEtOPh)4- ZnP with varied spacer distances have been synthesized and photosynthetic antenna-reaction center models were constructed via axial co-ordination with fulleropyrrolidines, C60Im and C70Im. Selective excitation of the BBA moiety in the porphyrins at 355 nm resulted in the quenching of the emission intensity of the BBA followed by the concomitant appearance of the ZnP emission at 600–640 nm indicating the occurrence of the photoinduced energy transfer from 1BBA* to ZnP. When the zinc porphyrins are titrated with C60Im and C70Im, supramolecular complexes of the type, (BBA)4-ZnP:[Formula: see text]Im/[Formula: see text]Im are formed and the complex formation was monitored by UV-visible spectroscopic studies. Steady-state fluorescence studies involving the excitation of the ZnP at 550 nm displayed the diminished fluorescence intensity of the ZnP emission indicating the photoinduced electron transfer from 1ZnP* to fullerenes. More interestingly, when the BBA moiety is excited in the supramolecular complexes, the emission of both the BBA and ZnP were decreased gradually indicating the occurrence of PEnT from 1BBA* to ZnP followed by a sequential electron transfer from 1ZnP* to C60Im or C70Im indicating the formation of a charge-separated state in these complexes.

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Thermally stable dopant-free soluble phthalocyanines as hole transporting materials for Perovskite solar cells

Srivishnu,

Palacharala,

Giribabu

2023

J. Porphyrins Phthalocyanines

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In enhancing the durability and photovoltaic performance of Perovskite solar cells, Hole transport Materials (HTMs) play the key role. In search of new HTMs, in this work, we have designed, synthesized and characterized 3,4,5 trimethoxy phenoxy substituent free-base soluble phthalocyanine (H2-TmPc) along with their metallo derivates with Cu(II) (Cu-TmPc) and Zn(II) (Zn-TmPc) derivatives and applied them as HTMs for PSC. All three HTMs were characterized by optical, electrochemical, thermal and impedance studies. Absorption spectra in chlorobenzene revealed two Q bands and a soret band whereas metallo derivatives showed a single Q and soret band. Electrochemical studies revealed that these HTMs are capable of extracting holes from the Perovskite layer. Impedance studies showed that Cu-TmPc showed high specific conductance of 1.78 × 10[Formula: see text] when compared to other derivatives. Based on these data PSCs were fabricated with these Pc series as HTMs and SnO2 as ETL layer and noticed that Cu-TmPc gave a power conversion efficiency of 5.7%.

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Photo-induced intramolecular electron transfer in phenoxazine-phthalocyanine donor-acceptor systems

Cited by 4 publications

References 36 publications

Novel phosphorus(v) tetrabenzotriazacorroles: synthesis, characterization, optical, electrochemical, and femtosecond nonlinear optical studies

Novel phosphorus(v) tetrabenzotriazacorroles: synthesis, characterization, optical, electrochemical, and femtosecond nonlinear optical studies

Light-induced energy and electron transfer occurring in tandem in tetra (bis(4′-tert-butylbiphenyl-4-yl)aniline)-zinc(II) porphyrin-fullerene supramolecular conjugates

Thermally stable dopant-free soluble phthalocyanines as hole transporting materials for Perovskite solar cells

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