Silica was isolated by pyrolysis and chemical treatment with NaOH from rice husk. Thus obtained silica was calcinated at different temperatures under different atmospheres. Highest surface area was recorded for the sample calcinated at 600oC under nitrogen atmosphere. This sample was labelled as RHSiO2. To increase basic sites on RHSiO2, amine impregnation was done by using MEA, DEA and PEI. On all these samples characterization studies like surface area, Pore size distribution, XRD, FT-IR, SEM were carried out. Infrared spectra of the silica is recorded by FT-IR spectrometer and the major chemical groups of silica are identified. The textural features of the amorphous silica observed by scanning electron microscopy (SEM) which clearly shows that amorphous silica has porous and multifaceted particle shape and size. CO2 adsorption capacities are increased with increase in wt. % of amines like MEA, DEA and PEI. However 25 wt.% PEI shows more adsorption capacities at high pressures, as it contains more number of basic or nitrogen containing groups on the surface matrix.
Complexes of the type [M(DTC)2 (H2O)2] where M=Ru and La and Nacs2 L= sodium salt of histamine dithiocarbomate ligands have been synthesised and characterised by physico chemical (elemental analysis, conductance magnetic susceptibility measurements) and spectral techniques Infrared spectroscopy, magnetic susceptibility, ultraviolet and Atomic absorption spectroscopy, 1HNMR spectroscopy. The FT-IR spectra of the complex indicate that ligand behave as a abidentate manner coordinating via nitrogen and sulphur for their structures and studied for structure activity relationship with complexes the anionic metal ligand complexes exhibit octahedral geometry. Thermal behaviour of these chealates show hydrated complexes losses water molecules of hydration in the first step. In thermogravitic analysis first step followed immediately by decomposition of the coordinated water, anions and ligands is the subsequent steps.
In Present work, the Reduction of ethyl 2-(4-phenyl substituted)-4-methylthiazole-5-carboxylate(1) by Lithium Aluminium hydride in diethyl ether Solvent yield (2-(4-phenyl substituted)-4-methylthiazol-5-yl) methanol (2) followed by Oxidation using IBX in the DMSO solvent, to yield 2-(4-phenyl substituted)-4- methylthiazole-5-carbaldehyde(3) which on further reaction with2-(4-phenyl substituted)-4-methylthiazole-5- carbohydrazide(4) in the presence of conc. sulphuric acid in ethanol solvent to yield N-((2-(4-phenyl substituted)- 4-methylthiazol-5-yl)methylene)-4-methyl-2-(phenyl substituted)thiazole-5-carbohydrazide(5) which further cyclisation with mercaptoacetic acid in presence of zinc chloride catalyst in DMF Solvent afforded series of thiazolidin-4-one derivatives namely N-(2-(2-(4-phenyl substituted)-4-methylthiazol-5-yl)-4-oxothiazolidin-3-yl)- 2-(4-phenyl substituted)-4-methyl thiazole-5-carboxamide(6a-h). The structure of all the synthesized compounds was characterized by FT-IR, 1H NMR, DIP MS data. Furthermore, compounds (6a-h) were screened for their antibacterial activity against gram negative (E. coli and P. aeruginosa) and gram positive (S. aureus and B. subtilis) bacteria, antifungal activity against pathogenic fungal strains and anti-inflammatory activities. Some of the compounds exhibited promising antibacterial, antifungal and anti-inflammatory activities.