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Zeolite-Y immobilized Metallo-ligand complexes: A novel heterogenous catalysts for selective oxidation.

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Title: Zeolite-Y immobilized Metallo-ligand complexes: A novel heterogenous catalysts for selective oxidation.
Authors: Godhani, Dinesh R.1 drgodhani@yahoo.com, Nakum, Haresh D.1, Parmar, Digvijaysinh K.1, Mehta, Jignasu P.1, Desai, Nisheeth C.1
Source: Inorganic Chemistry Communications. Oct2016, Vol. 72, p105-116. 12p.
Subjects: Metal complexes, Transition metals, Copper compounds, Zeolite Y, Oxidation, Cyclohexane
Abstract: Transition metal [M = Co(II), Cu(II)] complexes of H 2 L 1 and H 2 L 2 ligands have been prepared as neat and nanohybrid zeolite-Y immobilized complexes. The various analytical tools such as FTIR, ICP-AES, elemental analysis, UV–vis, Brunauer, Emmett and Teller (BET) surface area analysis, Thermal analysis, scanning electron micrographs, Powder XRD, conductivity, magnetic moment, and AAS were employed for the characterization of the prepared catalysts. Among all catalysts, the [Cu(L 1 )]-Y (heterogeneous) and [Cu(L 1 )] (homogeneous) have offered high activity and selectivity over oxidation of cyclohexene. Moreover, the [Cu(L 1 )] and [Cu(L 1 )]-Y were employed as catalyst over various organic substrates at identical reaction condition. The immobilized catalyst [Cu(L 1 )]-Y is found to be moderate active over oxidation of cyclohexane (75.2%,), benzene (8.21%), phenol (14.5%), styrene (87.5), benzyl alcohol (21.5%), limonene (11.2%), α-pinene (9.15%), and cyclooctane (76.8%) with high TON values (21942-2054). The mechanistic study using UV–vis and FTIR suggests the participation of active metalperoxo species, which is reinforced by its high catalytic activity over limonene (16.3%) in the absence oxidant. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Transition metal [M = Co(II), Cu(II)] complexes of H 2 L 1 and H 2 L 2 ligands have been prepared as neat and nanohybrid zeolite-Y immobilized complexes. The various analytical tools such as FTIR, ICP-AES, elemental analysis, UV–vis, Brunauer, Emmett and Teller (BET) surface area analysis, Thermal analysis, scanning electron micrographs, Powder XRD, conductivity, magnetic moment, and AAS were employed for the characterization of the prepared catalysts. Among all catalysts, the [Cu(L 1 )]-Y (heterogeneous) and [Cu(L 1 )] (homogeneous) have offered high activity and selectivity over oxidation of cyclohexene. Moreover, the [Cu(L 1 )] and [Cu(L 1 )]-Y were employed as catalyst over various organic substrates at identical reaction condition. The immobilized catalyst [Cu(L 1 )]-Y is found to be moderate active over oxidation of cyclohexane (75.2%,), benzene (8.21%), phenol (14.5%), styrene (87.5), benzyl alcohol (21.5%), limonene (11.2%), α-pinene (9.15%), and cyclooctane (76.8%) with high TON values (21942-2054). The mechanistic study using UV–vis and FTIR suggests the participation of active metalperoxo species, which is reinforced by its high catalytic activity over limonene (16.3%) in the absence oxidant. [ABSTRACT FROM AUTHOR]
ISSN:13877003
DOI:10.1016/j.inoche.2016.08.017