Spectrophotometric Study of Nitrogen Base Adducts of Nickel(II)-4-methyl-8–quinolinate

Adduct formation constants have been determined by spectrophotometric study of a few typical bases with nickel(II) chelate of 4-methyl-8-quinolinol in chloroform. Bathochromic and hypsochromic shifts were observed in the visible range due to the adduct formation. Monobasic bases like pyridine, methyl substituted anilines and such other bases exhibit 1: 2 stoichiometry giving hexa – coordinated adductds . The dibasic bases such as 1,10-phenanthroline and 2,9- neocuproine exhibit 1 : 1 stoichiometry giving hexacoordinated adducts . The experimental results are discussed in terms of the basicity and steric effects of the various bases

Design, synthesis and biological evaluation of aryl isoxazole incorporated pyrimidin-2-yl)oxazolo[4,5-b]pyridine derivatives as anticancer agents

A new library of Aryl Isoxazole Incorporated Pyrimidin-2-yl)oxazolo[4,5-b]pyridine compounds 11a-j and their structures were characterized by analytical data. Further, the preliminary anticancer activity of the newly prepared compounds 11a-j was examined against four types of human cancer cell lines, breast cancer (MCF-7), lung cancer (A549), colon cancer (Colo-205) and ovarian cancer (A2780) by utilizing the MTT method. Most of the compounds displayed good to moderate activities as compared with the etoposide used as a positive control. Amon, five compounds 11a, 11b, 11h, 11i and 11j exhibited more potent activity than the positive control. Mainly, compound 11h displayed superior anticancer activity

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Not AvailableHeavy metal accumulation in cephalopods has been one of the intricate issues in seafood export scenario in India. In recent years, many export consignments of cephalopods processed in Gujarat region were rejected on account of high levels of cadmium. To elucidate this problem, cephalopods landed at different landing centres and processed by various processing units were monitored during the period 2006-07. Among commercial samples of cephalopods, cuttlefish tentacles (0.52±0.08 ppm), squid tentacles (0.28±0.02 ppm) and frozen octopus (0.59±0.1 ppm) recorded highest accumulation of Cadmium. Organ-specific analysis revealed highest accumulation of Cd in the gut of Sepiella inermis (3.34±0.43 ppm) and Squid Uroteuthis (Photololigo) duvauceli (5.31±0.43 ppm). Similarly, in the Purpleback flying squid Sthenoteuthis oualaniensis, which is now a days landed by multiday fishing trawlers, highest residue level of Cd was observed in the liver (568.5 ±15 ppm), followed by gills, eyes and tentacles. Among different species of Octopus, highest accumulation was recorded in Octopus macropus (2.28± 1.11 ppm), followed by O. membranaceus (1.86 ±0.35 ppm) and O. defilippi (1.72 ±0.82 ppm). In order to find out the source of Cd, simulation studies were carried out by soaking squid muscle in ink, signifying the fact that poor post harvest handing and consequent rupture of ink sac, followed by soaking in ink-mixed water could be a reason behind high levels of Cd accumulation in cephalopods landed in Gujarat coast.Not Availabl

Conductivity and DSC studies of poly(ethylene glycol) and its salt complexes

456-458<span style="font-size: 15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">The temperature response of conductivity of poly(ethylene glycol) (PEG) and its salt complexes like KCI, KBr and KI has been studied in the temperature range 299 to 331 K. Doping of PEG with KCI and KBr increased the conductivity by about 2.5 times for KCI and about 6.25 times for KBr, while doping with KI reduced the conductivity to about 0.05 times its pure component value. This may be due to the presence of dissolved salt in the solid, or alternatively may be due to the changes in the structure of PEG induced by the presence of salt. DSC studies on the samples were carried out wherein a beautiful peak was observed near the melting point. Analysis of DSC results confirms that the reaction is endothermic and the peak shifts towards higher value for different salts as compared to pure PEG. </span

Spectrophotometric Study of Nitrogen Base Adducts of Nickel(II)-4-methyl-8–quinolinate

Adduct formation constants have been determined by spectrophotometric study of a few typical bases with nickel(II) chelate of 4-methyl-8-quinolinol in chloroform. Bathochromic and hypsochromic shifts were observed in the visible range due to the adduct formation. Monobasic bases like pyridine, methyl substituted anilines and such other bases exhibit 1: 2 stoichiometry giving hexa – coordinated adductds . The dibasic bases such as 1,10-phenanthroline and 2,9- neocuproine exhibit 1 : 1 stoichiometry giving hexacoordinated adducts . The experimental results are discussed in terms of the basicity and steric effects of the various bases

Hydrothermal synthesis and characterization of nanostructured nickel vanadate for supercapacitor and photocatalytic applications

We successfully synthesised nickel vanadate (NiVO _3 ) nanocomposite by an inexpensive hydrothermal technique. Several analytical methods have been employed to characterise the synthesised nanocomposite. The crystal structure of NiVO _3 is orthorhombic, and its crystallite size is around 10.3 nm. The NiVO _3 nanocomposite has an optical band gap of 2.62 eV from the absorption spectra analysis. At a current density of 5 Ag ^−1 , the NiVO _3 nanocomposite exhibits a specific capacitance value of 398 Fg ^−1 and a retention rate of almost 90% after 2000 cycles. Furthermore, stability studies show that at a current density of 5 Ag ^−1 , 90% of the capacitance is retained for 4000 cycles. The photocatalytic studies to break down the industrial pollutant Fast Orange Red (F-OR) dye show a 98.7% decolourization rate after 120 min of exposure to UV light irradiation. These features promote the creation of such nanocomposites for practical energy and environmental applications while providing a deeper understanding of the material’s characteristics