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Campos dos Goytacazes, Brazil

Kumar G.,Chemical science Laboratory | Johari R.,Vardhaman College | Devi S.,Vardhaman College
E-Journal of Chemistry | Year: 2012

A Schiff base ligand was synthesized by reacting 5-tert-butl-2-hydroxy-3- (3-phenylpent-3-yl) benzaldehyde and thiodihydrazide (2:1) and a series of metal complexes with this new ligand were synthesized by reaction with Cr (III), Mn (III), and Fe (III) metal salt in methanolic medium. The Schiff base ligand and its complexes have been characterized with the help of elemental analysis, conductance measurements, magnetic measurements and their structure configuration have been determined by various spectroscopic (electronic, IR, 1H NMR, 13C NMR, GCMS) techniques. Electronic and magnetic moments of the complexes indicate that the geometries of the metal centers were octahedral. IR spectral data suggest that ligand behaves as a tetradentate ligand with ONNO donor sequence towards the metal ion. © 2012 Hindawi Publishing Corporation. Source


Kumar G.,Chemical science Laboratory | Devi S.,Vardhman College | Johari R.,Vardhaman College
E-Journal of Chemistry | Year: 2012

M(III) Schiff base macrocyclic complexes of the type [HLMX2] where M = Cr(III), Mn(III), Fe(III) and X = Cl, OAc have been synthesized by condensation of acetylacetone and Thio-carbohydrazide (2:2) in the presence of divalent metal salt in methanolic medium. The complexes have been characterized with the help of elemental analysis, conductance measurements, magnetic measurements and their structural configuration have been determined by various spectroscopic (electronic, IR, 1H NMR, 13C NMR, GCMS) techniques. Electronic and magnetic moments of the complexes indicate that the geometries of the metal centers are octahedral. © 2012 Hindawi Publishing Corporation. Source


Portela R.,CIEMAT | Suarez S.,CIEMAT | Tessinari R.F.,CIEMAT | Tessinari R.F.,Chemical science Laboratory | And 3 more authors.
Applied Catalysis B: Environmental | Year: 2011

A novel versatile tubular reactor that may use both types of radiation, solar and/or artificial, and different types of suspended or immobilized photocatalysts is proposed. The photocatalytic reactor was evaluated for air treatment at laboratory scale and semi-pilot-plant scale. UV-A transparent immobilized photocatalysts were employed, which allowed an efficient use of radiation. Two different types of photocatalytic modules were tested: (a) TiO2-coated PET monoliths and (b) TiO2-coated glass slides, arranged in monolith-like units with the help of especially designed star-shaped polygonal structures. Both types of units were easy to handle and assured the adequate distribution of the photocatalyst inside the tubular reactor. The efficiency of the photocatalytic system with both solar and artificial radiation to oxidize the H2S contained in an air stream was demonstrated at the laboratory roof and in the treatment of real air of a wastewater treatment plant located in Madrid (Spain). As a consequence of the chemical nature of the pollutant, the photocatalytic activity decayed over time due to the accumulation of sulfate on the surface, but easy regeneration of the exhausted photocatalyst was achieved by washing with water. © 2011 Elsevier B.V. Source

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