Syntheses and investigation of the effects of position and nature of substituent on the spectral, electrochemical and spectroelectrochemical properties of new cobalt phthalocyanine complexes

Akinbulu, Isaac Adebayo; Nyokong, Tebello

doi:10.1016/j.poly.2010.01.004

Cited by 52 publications

(9 citation statements)

References 15 publications

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“…The oxidation system was further examined by UV–visible spectroscopy during the processes in order to investigate the catalytic mechanism for the Co‐catalyzed cyclohexene oxidation. The spectra of cobalt(II) phthalocyanines has been the subject of several reports . The spectrum of metal–phthalocyanine (MPc) complexes is well known and consists of an intense band, called the Q band, in the visible region .…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and catalytic activity of peripherally tetra‐substituted Co(II) phthalocyanines for cyclohexene oxidation

Saka

Bıyıklıoğlu

Kanteki̇n

et al. 2012

Applied Organom Chemis

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New 3,3-diphenylpropoxyphthalonitrile (5) was obtained from 3,3-diphenylpropanol (3) and 4-nitrophthalonitrile (4) with K 2 CO 3 in DMF at 50 C. The novel cobalt(II) phthalocyanine complexes, tetrakis- [2-(1,4-dioxa-8-azaspiro[4.5]dec-8-yl)ethoxy] phthalocyaninato cobalt(II) (2) and tetrakis-(3,3-diphenylpropoxy)phthalocyaninato cobalt(II) (6) were prepared by the reaction of the phthalonitrile derivatives 1 and 5 with CoCl 2 by microwave irradiation in 2-(dimethylamino)ethanol for at 175 C, 350 W for 7 and 10 min, respectively. These new cobalt(II)phthalocyanine complexes were characterized by spectroscopic methods (IR, UV-visible and mass spectroscopy) as well as elemental analysis. Complexes 2 and 6 are employed as catalyst for the oxidation of cyclohexene using tert-butyl hydroperoxide (TBHP), m-chloroperoxybenzoic acid (m-CPBA), aerobic oxygen and hydrogen peroxide (H 2 O 2 ) as oxidant. It is observed that both complexes can selectively oxidize cyclohexene to give 2-cyclohexene-1-ol as major product, and 2-cyclohexen-1-one and cyclohexene oxide as minor products. TBHP was found to be the best oxidant since minimal destruction of the catalyst, higher selectivity and conversion were observed in the products. a 2-Cyclohexen-1-ol. b 2-Cyclohexen-1-one. c Cyclolohexene oxide. d TON, moles of product/moles of catalyst. e TOF, moles of product/moles of catalyst Â time.

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Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and catalytic activity of peripherally tetra‐substituted Co(II) phthalocyanines for cyclohexene oxidation

Saka

Bıyıklıoğlu

Kanteki̇n

et al. 2012

Applied Organom Chemis

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“…Akinbulu et al. reported the electrochemical responce of cobalt phthalocyanine substitued diethylaminoethanethio [21]. When the redox responses of the CoPc and 1,3‐diethoxy‐2‐propanol substitued CoPc are compared (as shown in Table), minor differences were observed in the value peak potential.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization and Investigation of Electrochemical and Spectroelectrochemical Properties of Peripherally Tetra Diethoxypropan Substituted Phthalocyanines

2020

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In this study novel peripherally tetra 1,3‐diethoxy‐2‐propanol substituted Co(II), Cu(II), Mg(II), Ni(II) Zn(II) phthalocyanine derivatives were prepared. The characterization of the novel compounds was made by FT‐IR, 1H‐NMR, UV‐vis and MALDI‐TOF mass. Electrochemical, in‐situ spectroelectrochemical and electrocolorimetric measurements have been carried out with the aim to determine the redox properties, to illuminate reaction mechanism and the effect of substituent and metal center. Moreover, the color properties and aggregation tendency of compounds were also investigated.

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“…Metallophthalocyanines display typical electronic spectra with two strong absorption regions, one in the UV region at about 300–350 nm (B band) and the other in the visible region at 600–700 nm (Q band) . The electronic absorption spectra of the cobalt and iron phthalocyanines 4 and 5 , in chloroform at room temperature, are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Co(II) and Fe(II) phthalocyanines: synthesis, investigation of their catalytic activity towards phenolic compounds and electrochemical behaviour

Saka

Bıyıklıoğlu

2015

Applied Organom Chemis

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-[(1-Benzylpiperidin-4-yl)oxy]-substituted cobalt(II) and iron(II) phthalocyanine complexes were synthesized and their catalytic activity towards various phenolic compounds was investigated. Converting from environmentally harmful phenolic compounds into less harmful oxidation products using phthalocyanines makes this study attractive. This catalysis is feasible and timesaving in terms of procedure and the best oxidation conditions determined. Electrochemical studies were also carried out using cyclic voltammetry and square wave voltammetry techniques. Voltammetric analyses of the synthesized phthalocyanine complexes supported their proposed structures.

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Syntheses and investigation of the effects of position and nature of substituent on the spectral, electrochemical and spectroelectrochemical properties of new cobalt phthalocyanine complexes

Cited by 52 publications

References 15 publications

Synthesis, characterization and catalytic activity of peripherally tetra‐substituted Co(II) phthalocyanines for cyclohexene oxidation

Synthesis, characterization and catalytic activity of peripherally tetra‐substituted Co(II) phthalocyanines for cyclohexene oxidation

Synthesis, Characterization and Investigation of Electrochemical and Spectroelectrochemical Properties of Peripherally Tetra Diethoxypropan Substituted Phthalocyanines

Co(II) and Fe(II) phthalocyanines: synthesis, investigation of their catalytic activity towards phenolic compounds and electrochemical behaviour

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