Magnetic and Spectroscopic Investigations of Tetra(4-<i>t</i>-butyl)phthalocyano Complexes of Cobalt(II) and Copper(II)

Heucher, Reimar; Chandramouli, Gadisetti V.R.; Manoharan, P. T.

doi:10.1002/(sici)1099-1409(199807/10)2:4/5<423::aid-jpp116>3.0.co;2-t

Cited by 13 publications

(2 citation statements)

References 12 publications

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“…For the solution forms, the isotropic gfactor (g 0 ), the isotropic hyperfine coupling constant (A 0 ), and the line width coefficients c 0 , c 1 , and c 2 were derived to adjust the amplitude and the line widths of the peaks through the equation L = c 0 + c 1 (m I ) + c 2 (m I ) 2 , [35,36] where L is the line width and m I is the quantum number (m I = − I, − I + 1, . .…”

Section: Epr Studymentioning

confidence: 99%

Oxovanadium(IV) complexes based onS-alkyl-thiosemicarbazidato ligands. Synthesis, characterization, electrochemical, and antioxidant studies

İlhan-Ceylan

Tüzün

Kurt

et al. 2015

Journal of Sulfur Chemistry

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Reaction of VOSO 4 with 2-hydroxy-napthaldeyde-S-R-thiosemicarbazones (R: methyl, ethyl, propyl or allyl) and salicyl aldehyde yielded five-coordinate oxovanadium(IV) complexes having a N 1 ,N 4 -diarylidene-S-R-thiosemicarbazidato structures. The compounds were characterized by elemental analysis, magnetic measurements, electronic, infrared, 1 H-NMR, and electron paramagnetic resonance (EPR) spectra. The X-band EPR signals were recorded from powder forms and also in solution. All the complexes have a single asymmetric line shape and theoretical fit studies prove the presence of axial symmetry around the paramagnetic vanadium ions. A computer simulation of the EPR spectrum of each complex was carried out to derive the related EPR parameters. Cyclic voltammograms of the complexes exhibited two metal-based reversible redox peaks around 500 and − 800 mV corresponding to one electron oxidation/reduction of V IV O/V V O and V IV O/V III O, respectively. The reductive response in the 50-350 mV region was assigned to ligand reduction. Antioxidant activities of the compounds were determined with CUPric Reducing Antioxidant Capacity, 2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid, and 1,1-diphenyl-2-picrylhydrazyl assays. The test results indicated that the antioxidant capacity of the compounds increases with the carbon number of saturated hydrocarbon chain on sulfur atom.

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Section: Epr Studymentioning

confidence: 99%

Oxovanadium(IV) complexes based onS-alkyl-thiosemicarbazidato ligands. Synthesis, characterization, electrochemical, and antioxidant studies

İlhan-Ceylan

Tüzün

Kurt

et al. 2015

Journal of Sulfur Chemistry

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“…The electronic structure of different paramagnetic CoPc complexes has been studied by various spectroscopic means, including electron paramagnetic resonance (EPR) [12][13][14][15][16]. The majority of these investigations were done using continuous wave (CW) EPR and some studies reported conflicting data.…”

Section: Introductionmentioning

confidence: 99%

Solvent effects of cobalt(II) phthalocyanine in sulfuric acid: a continuous wave and pulse EPR study

Finazzo

Doorslaer

Schweiger

2003

J. Porphyrins Phthalocyanines

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Products based on metal phthalocyanines are widely used in industry. In the processing of these materials it is essential to control the conditions of the matrix the metal phthalocyanines are embedded in. Using the example of cobalt(II) phthalocyanine in sulfuric acid we show that continuous wave and pulse electron paramagnetic resonance and electron nuclear double resonance spectroscopy provide excellent tools to monitor the influence of the matrix on paramagnetic phthalocyanines. The g values, the cobalt hyperfine values, and the hyperfine and nuclear quadrupole couplings of the isoindole nitrogens, as well as the hyperfine interactions of the surrounding protons allow for a detailed assessment of the electronic structure of cobalt(II) phthalocyanine in sulfuric acid. Subtle differences between the system under study and related Co(II) porphyrin and corrin systems could be traced.

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Gold(II) Phthalocyanine Revisited: Synthesis and Spectroscopic Properties of Gold(III) Phthalocyanine and an Unprecedented Ring‐Contracted Phthalocyanine Analogue

Wong

Miura

Wright

et al. 2012

Chemistry A European J

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In 1965, gold(II) phthalocyanine (AuPc, 1) was described to be synthesized from unsubstituted 1,3-diiminoisoindoline and gold powder or AuBr. Compound 1 has been regarded as a rare example of a paramagnetic gold(II) complex. However, its chemistry, especially the oxidation state of the central gold ion, has not been previously explored due to the inherent insolubility of 1 caused by its unsubstituted structure. In our attempt to synthesize soluble AuPcs by using 5,6-di-substituted 1,3-diiminoisoindolines, gold(III) phthalocyanine chloride (3) and a gold(III) complex of an unprecedented ring-contracted phthalocyanine analogue ([18]tribenzo-pentaaza-triphyrin(4,1,1), 4) were isolated. With this discrepant result from the original literature in hand, a reinvestigation of the original AuPc synthesis by using unsubstituted 1,3-diiminoisoindoline and various gold salts (including gold powder and AuBr) was performed, finding that only unsubstituted analogues of 3 and 4 or free-base phthalocyanine were obtained. No gold(II)-containing species could be isolated.

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Magnetic and Spectroscopic Investigations of Tetra(4-t-butyl)phthalocyano Complexes of Cobalt(II) and Copper(II)

Cited by 13 publications

References 12 publications

Oxovanadium(IV) complexes based onS-alkyl-thiosemicarbazidato ligands. Synthesis, characterization, electrochemical, and antioxidant studies

Oxovanadium(IV) complexes based onS-alkyl-thiosemicarbazidato ligands. Synthesis, characterization, electrochemical, and antioxidant studies

Solvent effects of cobalt(II) phthalocyanine in sulfuric acid: a continuous wave and pulse EPR study

Gold(II) Phthalocyanine Revisited: Synthesis and Spectroscopic Properties of Gold(III) Phthalocyanine and an Unprecedented Ring‐Contracted Phthalocyanine Analogue

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