A simple
and direct pathway to synthesize heterogeneous catalyst
by covalently immobilizing a cobalt Schiff base complex on the surface
of amino functionalized graphene oxide for the cross coupling of aryl
halides and arylboronic acids is reported. The as synthesized samples
were characterized using various spectroscopic techniques and thermal
analysis to attain their structural and functional features. The analysis
confirmed that the Co bounded to the ligand using bi(N, O) linkage
and the Co Schiff base complex immobilized onto the functionalized
graphene oxide through its amino moiety. The catalytic investigation
confirmed the product yield up to 96.5% for the Suzuki cross coupling
using gas chromatography. ICP analysis shows that the central active
metal is 85% in its catalyst even after the fifth iteration. High
product yield, environmentally benign, easy workup, easy filtration
of catalyst, and mild reaction conditions are the main facets of this
catalyst.
Transition metal Schiff base complexes covalently immobilized on the surface of amino functionalized graphene sheet to catalyze C-C coupling reaction is reported. Graphene sheet which synthesized using mechanical exfoliation and then by differential oxidative reduction phenomenon of graphite. The schiff base ligand is prepared using aldehyde and amino groups containing compounds which further treated with metal salts to form metal complexes. The as-synthesized metal complexes was then incorporated into amino functionalized nanosheets which are characterized using different spectrochemical techniques. The catalytic investigation of the as-prepared catalyst were done by the cross coupling of aryl halides and aryl boronic acids to form biaryls as product in C-C cross coupling reaction. The yield of the products were high and selective which were analyzed using Gas chromatography technique. The advantage of this catalyst is high stability, recyclability easy recovery of catalyst, environmentally benign and mild reaction condition.
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