Encapsulated oxo-bridged organometallic cluster catalyst and a process for the preparation thereof
AssigneeCouncil of Scientific and Industrial Research
InventorsDarbha Srinivas, Suhas Arunkumar Chavan, Paul Ratnasamy
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Abstract
The present invention relates to a novel encapsulated organometallic cluster complex catalyst and to a process for the preparation thereof. The oxo-bridged organometallic cluster complex of the invention has at least one atom of cobalt and manganese encapsulated in micro and mesoporous porous solids like aluminosilicate zeolites, aluminophosphates, carbon molecular sieves, silica and is particularly effective for oxidation of aromatic alkyl groups to the carboxyl groups in high yields.
Claims15
An encapsulated organometallic cluster complex catalyst wherein the organometallic cluster is of formula [MM′2(μ3-O)(RCOO)mLm′]L′n, wherein M and M′ are 3d or mid to late transition metal ions, R is selected from the group consisting of alkyl containing 1 to 5 carbon atoms, aryl, substituted alkyl and substituted aryl group;
- m is in the range of from 3 to 6, L is selected from the group consisting of RCOO, pyridine, nitrogen-containing organic bases, H2O, and organic solvents;
- L′ is a halide ion or halide containing ion and m′ and n are in the range of 0 to 3, said complex being encapsulated in a porous material.
A process for the preparation of the encapsulated organometallic cluster complex of formula, [MM′2(μ3-O)(RCOO)mLm′]L′n, wherein M and M′ are 3d or mid to late transition metal ions R is selected from the group consisting of alkyl containing 1 to 5 carbon atoms, aryl substituted alkyl or substituted aryl group, m is in range of from 3 to 6, L is selected from the group consisting of RCOO, pyridine, nitrogen containing organic bases, H2O, and organic solvents, L′ is a halide ion or halide containing ion and m′ and n are each in the range of 0 to 3, said process comprising interacting an encapsulant with a mixture of solutions of sources of transition metal ions at a temperature in the range of 298° K to 358° K under constant stirring to obtain a solid product, washing and drying the solid product thoroughly at 390 to 410° K, and then adding to it an organic carboxylic acid, pyridine, salt of alkali metal and water, under constant agitation and pumping oxygen or air into the mixture for 2 to 4 h at 298° K and separating and drying the encapsulated complex at 298° K under vacuum to obtain the encapsulated oxo-bridged organometallic cluster catalyst.
Dependencies are inferred from the claim text.