Applied Chemistry

The present work is concerned with the synthesis and the structural elucidation of the two ligands, viz., 2-thio picolinamide (TPA) and 2-N-benzyl TPA. The isolated solid complexes are subjected to characterised by Wet chemical analysis (N, S, metal), Conductivity measurements, Infrared including far infrared spectral measurements and H¹ NMR, and Mass spectral measurements.

Wool fabric samples were dyed with the natural dye sambucus nigra, then post-mordanted with three different mordants individually: alum, chrome and ferrous. Thermal analysis of the undyed (blank), dyed and dyed mordanted samples is applied to study the thermal stability of the samples under investigation using thermogravimetry (TG) and differential scanning calorimetry (DSC) techniques. TG tested results indicate that the thermal stability of dyed wool mordanted with ferrous is enhanced than the blank (undyed) and other dyed mordanted samples. The relative TG results show that char residue of the wool samples after 600 °C is higher than the blank one, meaning lesser volatile hazardous components. DSC measurements show remarkable variation in the thermal behavior according to the type of mordant. Also, there is a change in the char yield and the temperature of decomposition. Fastness properties of the examined dyed wool fabrics were also examined and reported.

The industrial effluents have been recommended as potential source of irrigation water and nutrient sources for commercial cropping system. However, the high nutrient loads and presence of some growth retarding substances in industrial effluent may cause severe impact on plant germination and gross productivity of a commercial crop. Prior to field application the industrial effluent should be tested for its ecotoxicity using seed bioassay test. The of this study was to investigate the toxicity of distillery effluent (DE) using seeds of moong (Vigna radiata), guar (Cyamopsis tetragonoloba), Makai (Zea mays) and gehu (Triticum aestivum). For lab trial, a total of a total of five different concentrations of distillery effluents (20, 40, 60, 80 and 100%) were prepared by adding required quantity of distilled water. Seed germination, root length, shoot length, root weight, shoot weight and chlorophyll level etc. were measured in experimental set-ups. Result suggested 40% DE strength suitable for plants: C. Tetragonoloba (67.7%), T. aestivum (64%) and Z. Mays (92.3%) except in V.radiate (98% germination with 60% DE). The high DE indicates a toxic impact on seed germinations. The seedling growth and biomass also showed a close relationship with strength of DE in treatment set-up. In majority of set-ups, set-up with 20 – 60 % DE strength showed the better results of plant groths. The biochemical stress of high DE strength on seedling was also observed in this study. The study clearly support the utility of DE for plant production but after proper dilutions of the effluent.

Chemometrics is the application of statistical and mathematical methods, in particular multivariate methods, to handle chemical or process data. In this study, the global and reactivity descriptors with multivariate methods have been utilized as a potential tool for grouping of cyanuric acid. The global and reactivity descriptors of cyanuric acid tautomers were analyzed using Principal component analysis (PCA) and hierarchical cluster analysis (HCA) in different solvents. The tautomers constitute groups are similar in three solvents namely THF, DMF and water, but in ethanol solvent show different groups. In three solvents (THF,DMF and water), five tautomers, CA2, CA4, CA5, CA6 and CA7 constitute one group, but CA4, CA5, CA6 and CA7 unique well distinguished from the rest. The CA8, CA9 and CA1 tautomers constitute second group and CA10, CA11 and CA3 constitute a cluster of three tautomer types. In ethanol solvent , three tautomers, CA5, CA6 and CA7 constitute one group, the CA8, CA9 and CA1 tautomers constitute second group and CA10 and CA11 constitute a third group and CA2,CA3 and CA4 constitute a fourth group. The HCA results are very similar to those obtained with the PCA results.

Nickel (II) complexes and Copper (II) complexes with the two ligands TPA and 2-N-benzyl TPA with nitrate anion are prepared. The isolated solid complexes are subjected to various physical measurements, such as conductivity measurements, and spectral behaviour apart from the chemical analysis.

The elastic properties of mantle minerals are important for the interpretation of the structure and composition of the lower mantle and also in seismic studies. The elastic properties of minerals depend on its composition, crystal structure, temperature and the level of defect. In the present work we have calculated the elastic parameters such as bulk modulus, shear modulus, seismic velocities, and Debye temperatures of some garnets such as Pyrope garnet (Mg3Al2Si3O12) and Grossular garnet (Ca3Al2Si3O12) at different temperature ranges by using Hill's averaging method and other methods of thermodynamics.

Ab initio and Density functional theory with three basis sets have been used to study seventeen isomers comprising of six thioaldehydes and eleven thioketones, relative stabilities of the isomers and electronic properties of the molecules are reported. The results revealed that there is an increase in C=S bond length as the number of carbon atoms increases, although C=S bond lengths for thioaldehydes are shorter than that of the corresponding thioketones analogues. Generally, thioketone isomers are more thermodynamically stable than that of the corresponding thioaldehydes. The rearrangement of thioaldehydes to thioketones would be feasible and exothermic since both ?G? and ?H? have negative values. 13C NMR of thiocarbonyl carbon atoms and UV-visible absorption (?max) showed similar trend when plotted against C=S bond length, thus the electronic properties and chemical reactivities of the molecules would be predominantly governed by C=S group.

Terminalia spinosa species have very high durability and could survive for long while in use, even in areas prone to attack by termites or fungi. Extractives have been found to have different inhibition rates against fungi. Wood extractives play an important role in the natural durability. The objective of this study was to investigate the durability of Terminalia spinosa when exposed to wood decay fungi. Three brown-rot and three white-rot wood decay fungi were screened for their capacity to degrade T. spinosa .Samples were evaluated for decay by weight loss measurements using a modified E7-93 standard (AWPA) for block test method, growth inhibition by solvent extract of T. spinosa was also tested. Brown rot fungi P. placenta and C. puteana caused the highest weight losses of 16% and 15% on heartwood extracted with dichloromethane and acetone, respectively. P. sanguines a member of white rot fungi was the most aggressive in reducing weight by 24% on toluene/ethanol extracted heartwood. The later was comparable to weight loss of P. patula wood which was used as a positive control. All the test fungi species caused negligible weight loss of less than 2% on un-extracted heartwood of T. spinosa implying that extractives in the heartwood played an important role in preventing fungal infestation and hence damage. Efficacy of extracts increased with increase in concentration.

A novel and selective method for the fast determination of trace amounts of Co(II) ions in water samples has been developed. The procedure is based on the selective formation of Co(II) ions using mesoporous organo-silicas mesoporous silica at different pH followed by elution with organic eluents and determination by atomic absorption spectrometry The preconcentration factor was 100 (1 ml elution volume) for a 100 ml sample volume. The limit of detection of the proposed method is 1.0 ng ml?1. The maximum sorption capacity of sorbent under optimum conditions has been found to be 5mg of Co per gram of sorbent. The relative standard deviation under optimum conditions was 3.0% (n = 10). Accuracy and application of the method was estimated by using test samples of natural and synthetic water spiked with different amounts of Co(II) ion.

An experimental investigation of applying a magnetic field and a radiation source horizontally with the direction of alloy once and vertically in another, current range passing through alloy is (1-3) AMP. Alloy conductivity increase with magnetic field strength in the case of applying a magnetic field horizontally with the electrons movement direction once and vertically in another. Alloy electrical conductivity decreases with irradiation time when applying a magnetic field horizontally with the electrons movement direction once and vertically in another. Alloy conducutivity decreases with irradiation time by applying a magnetic field and a radiation source horizontally with the direction of alloy once and vertically in another. Magnetic field intensity increases with temperature when applying a magnetic field and a radiation source horizontally with the electrons direction in the alloy once and vertically in another.