Synthesis, electrochemical and photochemical properties of unsymmetrically substituted zinc phthalocyanine complexes

Matlaba, Pulane; Nyokong, Tebello

doi:10.1016/s0277-5387(02)01226-3

Cited by 109 publications

(54 citation statements)

References 24 publications

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“…Moreover, the shoulder of Q-band at 638 nm decreases in intensity, while the B-band intensity at 312 nm increases slightly. The bands at 438 and 468 nm and shifting of the Q-band indicate the formation of the [Co(I)Pc(-2)] 1-species, confirming the CV assignment of couple III to [Co(II) Pc(-2)]/[Co(I)Pc(-2)] 1-couple [50][51][52][53][54][55][56]. Decrease in the broadening of the Q-band and observation of split bands at 438 and 468 nm shows the aggregation-disaggregation equilibrium of the species.…”

Section: Voltammetric and Spectroelectrochemical Measurementssupporting

confidence: 53%

“…The in situ UV-Vis changes of 4 during constant applied potentials of the redox processes, as a representative of the complexes having ring-based redox processes, are seen in (Fig. 5c) [50][51][52][53][54][55]. This process occurred with clear isosbestic points at 296, 332, 402, 593 and 710 nm in the spectra.…”

Section: Voltammetric and Spectroelectrochemical Measurementsmentioning

confidence: 99%

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Synthesis, electrochemistry and in situ spectroelectrochemistry of water-soluble phthalocyanines

Atsay

Koca

Koçak

2009

Transition Met Chem

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The synthesis, characterization and voltammetric and spectroelectrochemical properties of newly synthesized metal-free and metallo phthalocyanines (M = Co, Cu, Zn) containing four dialkylaminophenoxy or trialkylammoniumphenoxy substituents on peripheral positions have been presented in this work. The new compounds have been characterized by using elemental analysis, UV-Vis, FT-IR, 1 H NMR and MS spectroscopic data. Phthalocyanines with trialkylammoniumphenoxy substituents are soluble in aqueous solution over a wide pH range, and these compounds are present as aggregated species in solution as confirmed by the blue shift of Q-bands in their electronic spectra. The electrochemical behavior of the phthalocyanines was investigated by cyclic voltammetry and differential pulse voltammetry on a platinum-working electrode in DCM and DMSO. The voltammetric and spectroelectrochemical measurements of the complexes show that while cobalt phthalocyanine gives both ligand-and metal-based redox processes, metal-free, zinc and copper phthalocyanine complexes give only ligandbased processes in harmony with common phthalocyanine complexes.

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Section: Voltammetric and Spectroelectrochemical Measurementssupporting

confidence: 53%

Section: Voltammetric and Spectroelectrochemical Measurementsmentioning

confidence: 99%

Synthesis, electrochemistry and in situ spectroelectrochemistry of water-soluble phthalocyanines

Atsay

Koca

Koçak

2009

Transition Met Chem

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“…The spectra of metal phthalocyanines were affected by π-π* excitation process of π orbital on the phthalocyanine rings. In the case of flat type of metal phthalocyanines using ZnPc [8,20], CuPc [21] and FePc [22], strong absorptions near 590 nm were identified to be excitation process from HOMO to LUMO or LUMO+1 and LUMO+2. In the case of shuttle cock types of phthalocyanine using TiOPc, VOPc and PbPc [23], first peak of absorption was originated from excitation process from HOMO to LUMO and LUMO+1.…”

Section: Resultsmentioning

confidence: 99%

Electronic structures and magnetic/optical properties of metal phthalocyanine complexes

Baba¹,

Suzuki²,

Oku³

2016

AIP Conference Proceedings

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Ground state electronic structures and spectra of zinc complexes of porphyrin, tetraazaporphyrin, tetrabenzoporphyrin, and phthalocyanine: A density functional theory study Abstract. Electronic structures and magnetic / optical properties of metal phthalocyanine complexes were studied by quantum calculations using density functional theory. Effects of central metal and expansion of π orbital on aromatic ring as conjugation system on the electronic structures, magnetic, optical properties and vibration modes of infrared and Raman spectra of metal phthalocyanines were investigated. Electron and charge density distribution and energy levels near frontier orbital and excited states were influenced by the deformed structures varied with central metal and charge. The magnetic parameters of chemical shifts in 13 C-nuclear magnetic resonance ( 13 C-NMR), principle g-tensor, A-tensor, V-tensor of electric field gradient and asymmetry parameters derived from the deformed structures with magnetic interaction of nuclear quadruple interaction based on electron and charge density distribution with a bias of charge near ligand under crystal field.

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“…In situ spectroelectrochemical (UV-Vis) measurements, carried out during the controlledpotential electrolysis of 5 in DMSO/TBAP solution at suitable potentials corresponding to its first reduction and first oxidation processes to perform the assignment of the relevant redox processes are shown in a The potential at which the current density reaches to 0.100 mA cm -2 was taken as the onset potential shift is typical of a metal-based oxidation in CoPc complexes, and thus confirms the CV assignment of the first oxidation couple (O1) of 5 to Co(II)Pc(-2)/[Co(III)Pc (-2)] ? process [38][39][40][41][42][43]. On the basis of the well-known electrochemical behavior of MPcs, the second reduction couple of 5 can be easily assigned to one-electron ringbased process [37].…”

Section: Methodsmentioning

confidence: 99%

Electrocatalytic Performances of Carbon Supported Metallophthalocyanine and Pt/Metallophthalocyanine Catalysts Towards Dioxygen Reduction in Acidic Medium

et al. 2009

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Electrocatalytic performances of phthalocyanines (Pcs) involving N-benzyl-4-phenyloxyacetamide moieties, dispersed on a high-surface area carbon substrate, Vulcan XC-72 (VC) and Nafion (Nf), towards oxygen reduction in acidic medium were determined and compared. The VC/Nf/CoPc(5) catalyst showed much higher catalytic activity than those of the other Pc(1-4)-based catalysts (H 2 Pc 1, ZnPc 2, NiPc 3 and CuPc 4) and that of unsubstituted CoPc-based one. The comparison of the performance of VC/Nf/Pt-5 dual catalyst with that of VC/ Nf/Pt one indicated that the former can be a good alternative to the latter as a cathode catalyst both in direct methanol and H 2 /O 2 fuel cell applications.

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Synthesis, electrochemical and photochemical properties of unsymmetrically substituted zinc phthalocyanine complexes

Cited by 109 publications

References 24 publications

Synthesis, electrochemistry and in situ spectroelectrochemistry of water-soluble phthalocyanines

Synthesis, electrochemistry and in situ spectroelectrochemistry of water-soluble phthalocyanines

Electronic structures and magnetic/optical properties of metal phthalocyanine complexes

Electrocatalytic Performances of Carbon Supported Metallophthalocyanine and Pt/Metallophthalocyanine Catalysts Towards Dioxygen Reduction in Acidic Medium

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