title: Metallogel templated synthesis and stabilization of silver-particles and its application in catalytic reduction of nitro-arene.
abstract: Metallogel of iron-carboxylates was obtained from trans-1,2-cyclohexanedicarboxylic acid in dimethylformamide (DMF) at basic condition. Spectroscopic and SEM morphology study of the iron-metallogel revealed that the iron complex with dicarboxylic acid was linked together via carboxylates and led to a supramolecular helical like architecture. The synthesized metallogel served as an excellent template for in-situ reduction of silver ion to silver particles micro to nano scale range. Variation of AgNO3concentration shepherd to change the morphology of the Ag-particles. AgNO3concentration was found to affect the shape and size of silver particles. On going from lower to higher concentration shape of silver particles changed from spherical to large agglomerated particles. Cubic shape Ag-particles were found on treatment of 0.05M AgNO3solution with metallogel. Cubical shape silver particles were found to be effective catalyst for nitro-arene reduction in presence of NaBH4. Density functional theory (DFT) calculations were performed to rationalize the role of Ag-particles in catalytic reduction of 4-nitrophenol to 4-aminophenol. Based on DFT study, we proposed that catalytic reduction occurred via Ag-hydride complex formation. Since metallogels as well as the 4-aminophenol are finding large application in pharmaceuticals industries therefore the current work can provide an alternatives path in production of 4-aminophenols. In addition to this, the synthesis of Ag-nanomaterials using metallogel as template can pave a new direction in the development of nanotechnology and might find wide applications in catalytic industrial processes.
authors.affiliation: Department of Chemical Sciences, Tezpur University, Assam 784028, India.
authors.forename: Mukesh
authors.initials: M
authors.lastname: Sharma
authors.affiliation: Department of Chemical Sciences, Tezpur University, Assam 784028, India.
authors.forename: Plaban Jyoti
authors.initials: PJ
authors.lastname: Sarma
authors.affiliation: Department of Chemistry, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam 781014, India.
authors.forename: Manash Jyoti
authors.initials: MJ
authors.lastname: Goswami
authors.affiliation: Department of Chemical Sciences, Tezpur University, Assam 784028, India. Electronic address: kusum@tezu.ernet.in.
authors.forename: Kusum K
authors.initials: KK
authors.lastname: Bania
mesh_terms: D000627:Aminophenols / Q000737:chemistry*; D002384:Catalysis; D003509:Cyclohexanecarboxylic Acids / Q000737:chemistry*; D003998:Dicarboxylic Acids / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D058085:Iron Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008958:Models, Molecular; D009596:Nitrophenols / Q000737:chemistry*; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry*
chemical_list: D000627:Aminophenols; D003509:Cyclohexanecarboxylic Acids; D003998:Dicarboxylic Acids; D005782:Gels; D058085:Iron Compounds; D009596:Nitrophenols; C534517:cyclohexane-1,2-dicarboxylic acid; D012834:Silver; C026729:4-aminophenol; C024836:4-nitrophenol
keywords: DFT; Fe-metallogel; Reduction of 4-nitrophenol; Silver particles; trans-1,2-Cyclohexanedicarboxylic