Volume-1 ~ Issue-6

Paper Type	:	Research Paper
Title	:	Characterisation and Thermal Decomposition of Lanthanide Complexes with 5-C-Prenylgallacatophenone
Country	:	India
Authors	:	Onkar Singh and M.L. Dhar
	:	10.9790/5736-0160104

Abstract: Solid complexes of 5-C-prenylgallacatophenone having general formula [M (C13H15O4)3] {Where M = La(III), Pr(III), Nd(III) & Tb(III)} are prepared and characterized by elemental analyses, I R., diffuse reflectance spectra, 1HNMR and thermal decomposition studies. They are found to have octahedral geometries. The complexes undergo thermal decomposition involving random nucleation mechanism. The evaluation of thermal kinetic parameters (E&Z) by using non isothermal method is reported.
Key words: Characterization, kinetic parameters, decomposition, complexes.

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Paper Type	:	Resaerch Paper
Title	:	Synthesis of Tribromomethyl substituted cyclo propanes via Dehalogenation Recation
Country	:	India
Authors	:	Ravi Ga, Prof Ravinder Nath Aa, Bhagya Laxmi Bb, Damodhar S
	:	10.9790/5736-0160508

Abstract :A two-step process for the synthesis of tribromomethyl-substituted cyclopropanes is described.
Halothane, an anesthetic agent, is added to olefins in a ruthenium-catalyzed reaction. The resulting 1,3-
dihalides are converted into cyclopropanes by dehalogenation with magnesium. This procedure represents an
alternative to metal-catalyzed cyclopropanations involving tribromomethyl diazomethane.

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Paper Type	:	Resaerch Paper
Title	:	Trace Metals Speciation in Floodplain Soil in Enugu Metropolis, Nigeria
Country	:	Nigeria
Authors	:	L.O. Ajala, V.I.Onwukeme
	:	10.9790/5736-0160913

Abstract: Soil samples were collected from floodplain sediment in Enugu Urban, Nigeria to investigate the speciation and bioavailability of some trace metals, namely; iron, manganese, copper, zinc, lead, nickel and cadmium. Extracts from the soil were obtained by sequential extraction as described by Horowitz et al. The metals occurred with the following percentage bioavailability: Fe(67.00%), Mn(65.10%), Cu(44.70%), Zn(52.90%), Pb(53.80%), Ni(53.90%) and Cd(8.30%). Exchangeable metals and metals bound to carbonates accounted for over 50% of the total fractions. Metals bound to Fe-Mn oxides and humic materials accumulated 4.50% and 7.96% respectively, while residual metals bounded 34.93% of the sediment fraction. Lead had the highest distribution in exchangeable, carbonate and residual fractions while zinc was partitioned mostly in reducible and oxidizable forms. The high concentration of lead in both the carbonate and exchangeable forms depict its greater mobility tendency in the soil and consequently, bioavailable to biota. The results of the finding indicated that these trace metals with exception of cadmium were readily bioavailable in this urban soil, therefore, phytoremediation is advocated.
Keywords: Speciation; Trace metals; Floodplain sediments; Bioavailability; Pollution.

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Paper Type	:	Resaerch Paper
Title	:	Studies of Influence of Ionic strengths of Cu (II) metal ion complex with Rubeanic acid by PH - metric technique.
Country	:	India
Authors	:	Quazi Syed Azharuddin
	:	10.9790/5736-0161416

Abstract: The interaction of Cu (II) metal ion complex with Rubeanic acid has been studied at various ionic strengths PH - metrically. The values of Pk [Proton - Ligand stability constant] and log k [Metal - Ligand stability constant] are utilised to estimate the thermodynamic stability constant at zero ionic strength and to know the exact nature of complexation equilibria. Pk/log k values are found to be increasing with decreasing the values of ionic strengths. Key words: Cu (II), Dithio-oxamide [Rubeanic acid] Ethanol.

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