Phthalocyanines: An Old Dog Can Still Have New (Photo)Tricks!

Schmidt, Andrea; Calvete, Mário J. F.

doi:10.3390/molecules26092823

Cited by 40 publications

(24 citation statements)

References 154 publications

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“…A similar comparison exercise has been reported by us in our recent work on porphyrins ( Kumar et al, 2021b ) and phthalocyanines ( Bhattacharya et al, 2021 ). There have been several NLO reports on novel phthalocyanines but with nanosecond pulses (see, e.g., Schmidt and Calvete, 2021 ), and we have not considered those in this comparison study. Recently a dimeric phthalocyanine zinc complex (bis-[2-hydroxy-9(10), 16(17), 23(24)-tri- tert -butylphthalocyanine]zinc–J-[ OH Pc t Zn] 2 ) was prepared and the NLO properties were investigated using ∼280 fs pulses ( Kazak et al, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

Optical, Electrochemical, Third-Order Nonlinear Optical Investigations of 3,4,5-Trimethoxy Phenyl Substituted Non-Aqueous Phthalocyanines

et al. 2021

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A new series of non-aqueous phthalocyanines having 3,4,5-trimethoxy phenyl group at peripheral positions in which the central cavity possessing Cu(II), Zn(II), and without metals has been synthesized, and its absorption, fluorescence (steady-state and excited state lifetimes), electrochemical, and third-order nonlinear optical (NLO) properties were evaluated. Absorption studies data suggest that all three phthalocyanines obey Beer–Lambert’s law, and the redox properties indicate that both oxidation and reduction reactions are macrocyclic centered. The singlet quantum yields were measured in different solvents and were found to be in the range of 0.2–0.5 in the case of free-base, whereas it was in the range of 0.1–0.5 in zinc derivative, while the time-resolved fluorescence data revealed lifetimes of typically a few ns. The third-order NLO properties were investigated using the Z-scan technique with kilohertz (for retrieving true electronic nonlinearities) and megahertz repetition rate femtosecond pulses at 800 nm. Intensity-dependent Z-scan studies revealed robust NLO coefficients for solutions and thin films (two-photon absorption cross-sections of 9,300–57,000 GM) of these molecules suggesting a strong potential for optical switching, imaging, and optical limiting applications.

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Section: Resultsmentioning

confidence: 99%

Optical, Electrochemical, Third-Order Nonlinear Optical Investigations of 3,4,5-Trimethoxy Phenyl Substituted Non-Aqueous Phthalocyanines

et al. 2021

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“…Herein, we shall investigate the tetranitro Zinc Phthalocyanine variation. Assessing how the tetranitro Zinc structural variations, influence the organic semiconducting dyes aggregation [7,9]. Comparing UV-Vis data against DFT computed data, allowing the type of aggregation occurring between the two tetranitro Zinc Phthalocyanine variation molecules to be deduced as well as supporting the theorised cause of aggregation-caused quenching theory.…”

Section: Introductionmentioning

confidence: 88%

“…Phthalocyanine isn't normally desirable as a solar organic semiconducting dye, theorised to result from this aggregation limiting solar cell efficiencies. Many variations to phthalocyanines structures can be introduced however, to alter its ability to aggregate and thus altering its theorised aggregation-caused quenching [7,8]. Variations can potentially make Phthalocyanine more desirable as a solar organic semiconducting dye.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Zinc (II) Phthalocyanine for Screening Potential Solar Cell Dye Application

Atkinson

2022

J. Mod. Mater.

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Phthalocyanine molecules have the potential to be used in select Dye Sensitized Solar Cells (DSSCs) and Luminescent Solar Concentrators (LSCs), due to UV-Vis absorbance in the 300-450 (nm) Soret Band, corresponding to π HOMO-1 to π* LUMO transition and 550-690 (nm) Q-band, corresponding to π HOMO to π* LUMO transitions. In this study Tetranitro Zinc (II) Phthalocyanine is synthesized via base catalysis before the product is characterized via IR, 1H NMR & UV-Vis analysis. Assessing the desirability of the Tetranitro Zinc (II) Phthalocyanine as a solar organic semiconducting dye in DSSCs and LSCs. The desirability is assessed by novel computational DFT calculations, of the aggregation binding mode to deduce if Aggregation-Caused Quenching (ACQ) is occurring in the aggregated sample. ACQ is known to reduce DSSCs and LSCs generation of useful photo-active current. Aggregation-Caused Quenching (ACQ) is mathematically indicated in Phthalocyanine aggregation and Tetranitro Zinc (II) Phthalocyanine’s desirability is assessed for further use in DSSCs and LSCs.

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“…The direct binding of up to 10 Pc molecules to 1 molecule of recombinant hamster PrP with micromolar affinity was demonstrated by Dee et al [18]. Pcs have been used in various photo-applications, including phototherapy of cancer, bioimaging and the photodynamic inactivation (PDI) of microorganisms [19,20]. Our laboratory was the first to utilize Pc for the PDI of prions [9].…”

Section: Introductionmentioning

confidence: 93%

Prion Strains Differ in Susceptibility to Photodynamic Oxidation

Kostelanská¹,

Holada²

2022

Molecules

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Prion disorders, or transmissible spongiform encephalophaties (TSE), are fatal neurodegenerative diseases affecting mammals. Prion-infectious particles comprise of misfolded pathological prion proteins (PrPTSE). Different TSEs are associated with distinct PrPTSE folds called prion strains. The high resistance of prions to conventional sterilization increases the risk of prion transmission in medical, veterinary and food industry practices. Recently, we have demonstrated the ability of disulfonated hydroxyaluminum phthalocyanine to photodynamically inactivate mouse RML prions by generated singlet oxygen. Herein, we studied the efficiency of three phthalocyanine derivatives in photodynamic treatment of seven mouse adapted prion strains originating from sheep, human, and cow species. We report the different susceptibilities of the strains to photodynamic oxidative elimination of PrPTSE epitopes: RML, A139, Fu-1 > mBSE, mvCJD > ME7, 22L. The efficiency of the phthalocyanine derivatives in the epitope elimination also differed (AlPcOH(SO3)2 > ZnPc(SO3)1–3 > SiPc(OH)2(SO3)1–3) and was not correlated to the yields of generated singlet oxygen. Our data suggest that the structural properties of both the phthalocyanine and the PrPTSE strain may affect the effectiveness of the photodynamic prion inactivation. Our finding provides a new option for the discrimination of prion strains and highlights the necessity of utilizing range of prion strains when validating the photodynamic prion decontamination procedures.

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Phthalocyanines: An Old Dog Can Still Have New (Photo)Tricks!

Cited by 40 publications

References 154 publications

Optical, Electrochemical, Third-Order Nonlinear Optical Investigations of 3,4,5-Trimethoxy Phenyl Substituted Non-Aqueous Phthalocyanines

Optical, Electrochemical, Third-Order Nonlinear Optical Investigations of 3,4,5-Trimethoxy Phenyl Substituted Non-Aqueous Phthalocyanines

Synthesis and Characterization of Zinc (II) Phthalocyanine for Screening Potential Solar Cell Dye Application

Prion Strains Differ in Susceptibility to Photodynamic Oxidation

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