Synthesis of Styrene-Allylchloride Copolymer Supported Cobalt(II) Schiff Base Complex and Its Catalytic Activity

Abstract

N,N 0 -bis(acetylacetone)o-phenylenediamine cobalt (II) Schiff base complex and its polymer bound analogue have been prepared and characterized for their structure and catalytic activity. To prepare heterogenized analogue of the cobalt (II) complex, a new crosslinked functional polymeric beads were prepared by suspension copolymerization of styrene (48.97 mmol, 5.1 g), allylchloride (48.97 mmol, 3.746 g) and divinylbenzene (1.50 mmol, 0.195 g) in the presence of azobisisobutyronitrile (9.0 £ 10 24 mmol, 0.15 g) as initiator at 25^0.18C under inert atmosphere. The beads of variable crosslinked densities were prepared by varying the amount of divinylbenzene in a reaction mixture from 0.80 -2.00 mmol. The beads prepared with 1.5 mmol of divinylbenzene contained 4.90 mmol (0.367 g) of allylchloride as found with the chlorine content in the beads. These beads have shown optimum degree of swelling (4.83%) and maximum attachment of N,N 0 -bis(acetylacetone)o-phenylenediamine Schiff base (1.96 mmol g 21 of beads). These beads have also shown maximum loading of cobalt (II) ions on polymer anchored Schiff base (1.37 mmol g 21 of beads). The spectral and magnetic measurements have suggested a square planar structure for cobalt (II) complex both in homogeneous and heterogeneous state. The heterogenized cobalt (II) complex has shown an enhanced rate of decomposition of hydrogen peroxide with low activation energy (42.37 kJ mol 21 ) in comparison to a homogenized complex (63.59 kJ mol 21 ). The rate of decomposition has been found to be directly 475 proportional to the concentration of hydrogen peroxide and cobalt (II) complex. A suitable rate expression has been derived for the decomposition of hydrogen peroxide.

Schiff base‐substituted polyphenol: synthesis, characterisation and non‐isothermal degradation kinetics

“…Thus, differential thermal analysis (DTA) and other thermo‐analytical methods are used to determine kinetic parameters of their thermal decomposition such as activation energy, enthalpy and entropy. Several studies dealing with the thermal properties of polymers have been published during the last decade 11–14. The thermal decomposition behaviours of some oligomer–metal complexes were studied by El‐Shekeil et al 15 and Kaya and Bilici 16.…”

<b>Synthesis, characterization, thermal degradation and electrical conductivity of poly-4-[(pyridin-2-yl-imino)methyl]benzene-1,3-diol and polymer-metal complexes</b>

“…Polymer metal complex compounds have useful properties such as catalytic activity, thermal stability, ion selectivity, conductivity and anti-microbial properties. Catalytic activity of a styrene-allylchloride copolymer supported Co(II) Schiff base complex compound was studied by Gupta et al [14]. The thermal and conductivity properties of Zn(II), Ni(II), Th(II), Cd(II), Mg(II) complex compounds of poly (8-acryloxyquinoline) were studied by Kaliyappan et al [15].…”

Synthesis, Characterization and Thermal Degradation of Oligo‐2‐[(4‐hydroxyphenyl) Imino Methyl]‐1‐naphtol and Oligomer‐Metal Complexes

“…Polymer metal complex compounds have useful properties such as catalytic activity, thermal stability, ion selectivity, conductivity and anti-microbial properties. Catalytic activity of a styrene-allylchloride copolymer supported cobalt (II) Schiff base complex compound was studied by Gupta et al (6). The thermal and conductivity properties of Zn (II), Ni (II), Th (II), Cd (II), Mg (II) complex compounds of poly(8-acryloxyquinoline) were studied by Kaliyappan et al (7).…”