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Title: Coordination polymers based on bridging methylene group as catalysts for the liquid phase hydroxylation of phenol
Authors: Maurya, Mannar Ram
Jain I.
Titinchi S.J.J.
Published in: Applied Catalysis A: General
Abstract: Reaction between 5,5′-methylene bis(salicylaldehyde) and 1,2-diaminoethane or 1,3-diaminopropane in equimolar ratio leads to the formation of new polymeric chelating ligands abbreviated herein as [-CH 2H2(salen)-]n (I) and [-CH2H 2(salpn)-]n (II). These ligands react with acetates of copper(II), nickel(II) and cobalt(II) to give coordination polymers of the types [-CH2{M(salen)·X DMF}-]n/[-CH 2{M(salpn)·X DMF}-]n [when ligand = I: X = 0, M = Cu (1); X = 0, M = Ni (2); X = 2, M = Co (3) and when ligand = II: X = 0, M = Cu (5); X = 2, M = Ni (6); X = 2, M = Co (7)]. Treatment of [MoO 2(acac)2] with these ligands gives dioxomolybdenum(VI) complexes [-CH2{MoO2(salen)}-]n (4) and [-CH2{MoO2(salpn)}-]n (8). All these complexes are insoluble in most coordinating and non-coordinating solvents. The nickel(II) complex [-CH2{Ni(salen)}-]n and both molybdenum complexes are diamagnetic while others are paramagnetic. IR spectral data confirm the coordination of ligands through the azomethine nitrogen and the phenolic oxygen atoms to the metal ions. Electronic spectral data suggest an octahedral structure for each repeating unit in 3, 4, 6, 7 and 8 while square planar for each repeating unit in 1, 2 and 5. All these complexes, except molybdenum ones, exhibit good catalytic activity towards the hydroxylation of phenol into a mixture of catechol and hydroquinone using H2O 2 as an oxidant. Various parameters such as concentration of substrate, catalyst and oxidant, reaction time and volume of the solvent have been taken into consideration for the maximum hydroxylation of phenol. © 2003 Elsevier Science B.V. All rights reserved.
Citation: Applied Catalysis A: General, 249(1): 139-149
Issue Date: 2003
Keywords: Catechol
Coordination polymers
Phenol hydroxylation
ISSN: 0926860X
Author Scopus IDs: 7005255411
Author Affiliations: Maurya, M.R., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Jain, I., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Titinchi, S.J.J., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Funding Details: Authors are thankful to Dr. Shri Chand and Ms. Hanna S. Abbo of Chemical Engineering Department of our institute for help in carrying out catalytic activities. MRM is also thankful to Council of Scientific and Industrial Research, New Delhi for financial support of the work. Council of Scientific and Industrial Research, India, CSIR
Corresponding Author: Maurya, M.R.; Department of Chemistry, , Roorkee 247 667, India; email:
Appears in Collections:Journal Publications [CY]

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