Microwave-assisted synthesis and characterization of Co(II) phthalocyanine and investigation of its catalytic activity on 4-nitrophenol oxidation

Abstract

Abstract:In this study, new cobalt phthalocyanine containing a 2-(2-benzothiazolylthio)ethoxy group at peripheral positions has been synthesized and characterized by spectroscopic methods (IR, UV-Vis elemental analysis, and mass spectroscopies). Catalytic activity of Co(II) phthalocyanine has been investigated in the presence of oxidants such as tert-buthylhydroperoxide, m-chloroperoxybenzoic acid, and H 2 O 2 . Co(II) phthalocyanine shows catalytically activity and product conversion under mild conditions. To find the optimal conditions in the oxidation process, substrate ratio, oxidant ratio, temperature, and oxidant type were examined over 3 h. The results exhibit the best optimum reaction conditions in this catalytic system.

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

“…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.…”

New phthalonitrile/metal phthalocyanine–gold nanoparticle conjugates for biological applications

“…The π-π* transitions from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO) result in a Q-band around 700 nm; however, π-π* transitions from deeper π-orbitals to the LUMO lead to the appearance of a B-band around 350 nm. [23][24][25][26][27][28][29][30][31][32] Two-dimensional (2D) phthalocyanine rings can be associated and form dimers, trimers, or oligomers. This occurrence is termed aggregation, and affects the solubility, bioavailability, in vivo distribution, and optical properties of phthalocyanines.…”

“…These modifications increase the distance between the Pc rings and decrease the π-stacking interactions, which in turn improves the phthalocyanines' solubility. [23][24][25][26][27][28][29][30][31][32] Also, structural alterations of the phthalocyanines lead to changes in their chemical, physical, and electronic features. Generally, substituted phthalocyanines are prepared by the cyclotetramerization of mono-, di-, or tetra-substituted phthalonitrile derivatives in the absence or presence of metal salts in a high-boiling organic solvent that is made sufficiently basic by the addition of a strong base (1,5-diazabicyclo[4.3.0] non-5-ene (DBN) or 1,8-diazabicyclo [5.4.0]undec-7-ene (DBU)).…”

Synthesis and computational studies of new metallo-phthalocyanines bearing dibenzoxanthenes and evaluation of their optical properties in solution and solid PMMA/ZnPc/Al nanocomposite films

“…1 Recently, Pc complexes have been investigated in diverse fields such as solar cells, 2 photovoltaic cells, 3 semiconductor devices, 4 electrochromic displays, 5 photodynamic therapy (PDT), 6,7 optical disks, 8 gas sensors, 9 chemical sensors, 10 liquid crystals, 11 film materials, 12 laser dye, 13 nonlinear optics, 14 and various catalytic processes. 15,16 Stability and solubility are the main key factors to determine the functionality of a dye. Recently, synthesis of dye-based black matrix (BM), a component of LCD color filters, has been attracting extensive interest.…”