Photoperoxidation of a Diamino Zinc Porphyrazine to the <i>seco</i>-Zinc Porphyrazine:  Suicide or Murder?

Montalbán, Antonio; Meunier, H.; Ostler, R. B.; Barrett, Anthony G. M.; Hoffman, Brian M.; Rumbles, Garry

doi:10.1021/jp9905068

Cited by 55 publications

(26 citation statements)

References 13 publications

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“…Fluorescence quantum yields (F F ), were determined by the comparative method [38,39], Equation (9), using chlorophyll a in ether (F F = 0.32 [40]), as the reference.…”

Section: Photophysical and Photochemical Parametersmentioning

confidence: 99%

Protonation of some non-transition metal phthalocyanines — spectral and photophysicochemical consequences

Ogunsipe

Idowu

Ogunbayo

et al. 2012

J. Porphyrins Phthalocyanines

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The photophysics and photochemistry of phthalocyanine complexes of magnesium (MgPc), aluminum chloride (ClAlPc) and zinc (ZnPc) are studied in N, N′-dimethylformamide (DMF). The values obtained for the photophysical and photochemical parameters are normal for simple metallophthalocyanine (MPc) complexes. Protonation of the azomethine bridges reduced the photoactivities of the complexes considerably; however the excited triplet states of the protonated species are more stable towards ground state oxygen. The interaction of the non-protonated MPcs with ground state oxygen is shown to be diffusion-assisted, with bimolecular rate constant values of the order of 10 10 M -1 .s -1 . MgPc could not be protonated; it was easily demetalated by the protonating acid. The kinetics of the demetalation yielded the rate equation: Rate = 0.1[MgPc][H + ] 2/3 .

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“…Fluorescence quantum yields (F F ), were determined by the comparative method [38,39], Equation (9), using chlorophyll a in ether (F F = 0.32 [40]), as the reference.…”

Section: Photophysical and Photochemical Parametersmentioning

confidence: 99%

Protonation of some non-transition metal phthalocyanines — spectral and photophysicochemical consequences

Ogunsipe

Idowu

Ogunbayo

et al. 2012

J. Porphyrins Phthalocyanines

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“…Fluorescence quantum yields (ΦF) were determined by the comparative method, 19,20 Eq. (1), using chlorophyll a in ether (ΦF=0.32) 21 as the reference.…”

Section: Fluorescence Quantum Yieldsmentioning

confidence: 99%

Solvent Effects on the Photophysicochemical Properties of Tetra(tert-butylphenoxy)phthalocyaninato Zinc(II)

Abimbola¹,

P.M.B²,

Nyokong

2011

Acta Physico-Chimica Sinica

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The solvent viscosity dependence of the photophysical and photochemical properties of tetra(tert-butylphenoxy)phthalocyaninato zinc(II) (ZnTBPPc) is presented. The fluorescence quantum yields (ΦF) and Stern-Volmer′ s constant (KSV) for ZnTBPPc fluorescence quenching by benzoquinone in all the solutions followed a semi-empirical law that depends only on the solvent viscosity. ΦF values vary between 0.08 in tetrahydrofuran (THF) and 0.14 in dimethylsulphoxide (DMSO). Triplet quantum yields (ΦT) and lifetimes (τT) also exhibit clear solvent viscosity dependence with the values being higher in the most viscous solvents. The interaction of the ZnTBPPc triplet state with oxygen was found to be diffusioncontrolled, but higher rate constants were observed in low-viscosity solvents like THF and toluene. Absolute values of singlet oxygen quantum yields (ΦΔ) were determined, and the values are comparable in all the solvents, which is attributed to the proximity of the ZnTBPPc triplet energies in different solvents.

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“…11,12 Solvent polymeric membrane sensors based on porphyrin and phthtalocyanine systems have been investigated for a broad range of mono-and di-valent cations. 13 Porphyrazines substituted in the periphery have myriad potential applications as photosensitizers for photodynamic therapy of cancer, 14 gas and metal ion sensors, 15 molecular conductors 16 and non-linear optical materials. 17 Phthalocyanines, while interacting with a Lewis acid (e.g.…”

Section: Introductionmentioning

confidence: 99%

Potential Aluminium(III)- and Gallium(III)-selective Optical Sensors Based on Porphyrazines

et al. 2011

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Porphyrazines possessing non-coordinating alkyl (propyl) and aralkyl (4-tert-butylphenyl) groups in the periphery were studied as optical sensors for a set of mono-, di-and trivalent cations. Investigated porphyrazines in the UV-Vis monitored titrations revealed significant responses towards aluminium and gallium cations, unlike other metal ions studied. Additionally, porphyrazine possessing 4-tert-butylphenyl peripheral substituents showed sensor property towards ruthenium cation and was chosen for further investigation. The presence of isosbestic points in absorption spectra for its titration with aluminium, gallium and ruthenium cations, accompanied by a linear Benesi-Hildebrand plot, proved complex formation. The continuous variation method was used to determine binding stoichiometry in 1:1 porphyrazine-metal ratio. X-Ray studies and density functional theory calculations were employed to investigate octa(4-tert-butylphenyl)-porphyrazine structure. The results helped to explain the observed selectivity towards certain ions. Interaction between ion and porphyrazine meso nitrogen in a Lewis acid-Lewis base manner is proposed.

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Photoperoxidation of a Diamino Zinc Porphyrazine to the seco-Zinc Porphyrazine: Suicide or Murder?

Cited by 55 publications

References 13 publications

Protonation of some non-transition metal phthalocyanines — spectral and photophysicochemical consequences

Protonation of some non-transition metal phthalocyanines — spectral and photophysicochemical consequences

Solvent Effects on the Photophysicochemical Properties of Tetra(tert-butylphenoxy)phthalocyaninato Zinc(II)

Potential Aluminium(III)- and Gallium(III)-selective Optical Sensors Based on Porphyrazines

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