This study reports the synthesis of metal complexes of mixed ligands p-Chlorophenyl-, p-Bromophenyl-dithiocarbamates. The spectral properties of the metal complexes [Zn(II), Cd(II), Hg(II), Cu(II), Co(II) and Ni(II)] were obtained using the FTIR and UV/Vis spectroscopic techniques. Their antibacterial studies revealed that these complexes as well as the ligands could serve as possible antibacterial agents against pathogens. Melting point and solubility measurements were also carried out. It was observed that these complexes were non-toxic, non-electrolytic and stable solids.

Sulfadiazine Schiff base and Phenyl dithiocarbamate mixed ligand metal complexes have been synthesized and characterized. The characterization of metal complexes is based on the results of the solubility, colour, melting points and elemental analysis as well as the spectroscopic studies. The results obtained from the spectroscopic spectra revealed from the UV-visible showed the presence of chromophoric groups while the FTIR results confirmed that the metals coordinated through the two nitrogen atoms of Sulfadiazine Schiff base and sulphur atom of the N-phenyl dithiocarbamate. Also the antimicrobial activities of the metal complexes proved that the metal complexes are more active than the parent ligands.

Synthesis, Characterization and Antimicrobial Properties of Pd(II), Cr(III), Ni(II) and Co(II) Metal Complexes of Aniline and Sulphadiazine Schiff Bases as mixed Ligands.Novel Pd(II), Cr(III), Ni(II) and Co(II) metal complexes of Schiff bases were synthesized from the condensation reaction between salicylaldehyde and aniline (L1) and sulphadiazine (L2).They were characterized using FTIR and UV-Visible spectroscopy and subjected to conductivity, melting point and solubility measurements.The complexes are non-toxic, non-electrolytic and stable solids.The involvement of the azomethine nitrogen in coordination with the metals was confirmed by the IR and UV results.They showed good inhibitory activities against various microorganisms.

Zn(II), Cd(II) and Hg(II) complexes of N-hexyl dithiocarbamate was synthesized and characterized using elemental analysis, thermogravimetric analysis; UV-Vis, FTIR and 1 H-and 13 C-NMR spectroscopy. The metal complexes were thermolysed at 180 degrees C to prepare hexadecylamine capped metal sulphide nanoparticles and their corresponding metal sulphide nanoparticles/poly(methyl methacrylate) nanocomposites. The optical properties of the nanoparticles and PMMA/nanocomposites were studied by absorption and photoluminescence spectroscopy. The structural studies were carried out with powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and FTIR. The TEM images shows nanoparticles with particles sizes that varied between 3.37-5-89 nm for ZnS and 10.15-37.25 nm for CdS and 9.49-15.60 nm for HgS nanoparticles respectively. The EDS results from the SEM determinations of the different metal sulphide nanoparticles/PMMA nanocomposite materials confirmed the presence of the nanoparticles in the polymer matrix and the broadening of diffraction peaks observed in the XRD of the nanocomposites also confirmed their formation.

Synthesis, characterization and antimicrobial activities of mixed ligand metal complexes of N-Phenyl dithiocarbamate with schiff base of Mn(II), Fe(II), and Pb(II),Co(II),Ni (II),Cu (II),Zn(II) and Cd (II) metal ions were carried out in this study. The ligands and their respective metal complexes were characterized by FTIR, UV spectroscopy, and elemental analysis. The data from the elemental analysis suggest a good agreement between the calculated and the experimental values for the elements viz; C, H, N and S. Also, the UV-Visible and FTIR spectroscopic data revealed that the metal complexes coordinate through the nitrogen and oxygen atoms of the alanine Schiff base and via the two sulphur atoms of the N-Phenyl dithiocarbamate ligands which serve as bidentate sites for the ligand.The antimicrobial l studies revealed that the synthesized ligands and their metal complexes recorded strong potency against the pathogens being investigated, suggesting that they could serve as good antimicrobial agents against the selected pathogens.

Nove l cobalt(II) diphenylamine complexes have been synthesized in water-methanol medium and characterized on the basis of their elemental analysis, melting points, solubility tests, conductivity tests, UV-Visible and IR spectral studies. The antimicrobial activities of the cobalt (II) complexes were screened against Enterohaemorragic coli, Staphylococcus aureus, Clostridium tetani, Neisseria gonorrheae and Streptococcus pyogeus bacteria and Mucor, Rhizomucor, Aspergillus fumigates, Rhizopus, Sporothrix schenckii, Aspergillus flavus, Aspergillus terreus, Absidia, Aspergillus niger and Candida spp pathogenic fungi. The melting points or decomposition temperatures of the metal complexes fell between 89-101 degrees C. The colors of the metal complexes range from blue to purple. The spectral results suggest the binding of diphenylamine( ligand) through the nitrogen atom to the cobalt( II) ions. The absorption bands observed in the Uv-Visible region are presumed to be due to charge transfer or intra-ligand transitions from the ligands or d-d transition from the metal ions. The metal complexes displayed proactive activities against the tested bacteria and fungi pathogens.

Assessment of spring water from Ikare-Akoko, a rural setting in southwest, Nigeria for microbial and chemical contaminants was carried out. Total heterotrophic bacteria count of 4.0 x 10 6 CFU/mL was highest during the peak of the rainy season in Omi-idu spring (Igbede community) while the lowest population of 0.14 x10 6 CFU/mL was in Agadagidi spring (Ishakunmi community). The highest coliform population of 2.8 x 10 6 CFU/mL was at Isunpaiye (Oyinmo community), while the lowest value of 0.19 x10 6 CFU/mL was recorded at Agadagidi (Ishakunmi). The multiple tube fermentation technique was employed to determine the most probable number (MPN) of coliforms per 100 mL of water sample. The highest MPN/100 mL value of 76 ± 2.1 for coliforms was recorded at Isunpaiye while the lowest value of 5.1 ± 2.1 was in Agadagidi spring. Physico-chemical properties of the spring waters were mostly within the WHO benchmark for potable water. Arae had the highest total dissolved solids (TDS) value of 969 mgL -1 (benchmark, 500 mg/L), total hardness values were normal except at Arae (260 mg/L). Heavy metals levels in the spring water were generally low except in Omi-idu spring. Key words: Rural setting, spring water, heterotrophic bacteria, coliform bacteria, physico-chemical properties, heavy metals.

Zn(II), Cd(II) and Hg(II) dithiocarbamate complexes have been synthesized and characterized by elemental analysis, thermogravimetric analysis, UV-Vis, FTIR, H-1- and C-13 NMR spectroscopy. The complexes were thermolysed at 180 degrees C and used as single molecule precursors for the synthesis of HDA capped ZnS, CdS and HgS nanoparticles and polymethylmethacrylate (PMMA) nanocomposites. The optical and structural properties of the nanoparticles and nanocomposites were studied by UV-Vis, PL, XRD and SEM. The crystallites sizes of the nanoparticles varied between 3.03 and 23.45 nm. SEM and EDX analyses of the nanocomposites confirmed the presence of the nanoparticles in the polymer matrix. (C) 2013 Elsevier B.V. All rights reserved.

The asymmetric unit of the title compound, C(18)H(20)N(2)S(4), contains one half-mol-ecule, the complete molecule being generated by a twofold rotation axis. The plane through the NCS(2) group [maximum deviation = 0.01 (7) Å] is orthogonal to the phenyl ring, forming a dihedral angle of 89.4 (3)°. The crystal structure is stabilized by inter-molecular C-H⋯π inter-actions.

The seasonal trends and partitioning behavior of polycyclic aromatic hydrocarbons (PAHs) in sediments and their corresponding porewater were investigated in Ondo coastal region, Nigeria. The mean total PAH concentrations varied from 0.16 to 8.88 μg g−1 in sediments and from below limits of detection to 2.95 μg L−1 in porewaters during both seasons. Levels were dominated by phenanthrene and anthracene. The in situ sediment-porewater partition coefficients (K oc’s) of PAHs increased with the organic carbon content (R 2 = 0.85) and even more strongly with the amount of clay and silt (R 2 = 0.87) during both seasons and significantly correlated with their octanol–water partition coefficients (logK ow, with R 2 ≥ 0.74) when logK ow values were less than 6.0. Linear relationships were observed between in situ logK oc and those predicted from reviewed papers, suggesting heterogeneity within the sediment organic carbon matrices. This partition coefficient is helpful to predict the PAHs distributions in the river sediments in order to better understand their fate and assess their potential environmental risks.

The asymmetric unit of the title compound, C18H20N2S4, contains one half-molecule, the complete molecule being generated by a twofold rotation axis. The plane through the NCS2 group [maximum deviation = 0.01 (7)angstrom] is orthogonal to the phenyl ring, forming a dihedral angle of 89.4 (3)degrees. The crystal structure is stabilized by intermolecular C-H center dot center dot center dot pi interactions.

The bioconcentration levels of 3 non-essential elements (Pb, Cd and Ni) have been investigated in three different seafoods; Fish (Tilapia zilli), Crab (Callinectes sapidus) and periwinkle (Littorina littorea), to investigate the ecosystem health status in Ondo oil-polluted coastal region, Nigeria. The seafood samples were chosen based on their popularity as a food source and the potential of the species to contain high levels of metals based on past research results. Metal concentrations in the biota showed marked interspecific differences with C. sapidus recording the highest concentrations of all the metals. The bioconcentration factor (BCF) showed that C. sapidus and T. zilli have the greatest potential to concentrate Cd (BCF = 3-10) and Pb (BCF = 11-84) respectively. Lead uptake from both water and sediment (BCF ≈ BSAF: 0.003-0.018) were abysmally low in L. littorea as compared with other organisms. The high concentrations of Pb in fish species, effective bioaccumulation of Cd in species of crab and periwinkles, as well as very high BSAF of Ni found in species of crab indicated a strong influence from anthropogenic pollutant source on the biotic community. Oil pollution appears to be a major source of bioavailable metal contaminants for the selected biota. The study shows that C. sapidus and L. littorea can effectively compartmentalize potentially toxic metals such as Cd, Pb and Ni within their tissues. In terms of toxicity, C. sapidus had Cd concentrations greater than the 3,000 ng/g limit set by the Commission of the European Communities while Pb concentration exceeded their limits in both C. sapidus and T. zilli. All levels of Ni were below the U.S. Food and Drug Administration action levels for these metals in fish, crustaceans and shellfish. The study revealed anthropogenic enrichment of the metals studied which can possibly pose potential threats to the ecology of the area.

Virtually, all parts of the calabash (Crescentia cujete) tree have been found to be useful; the wood for tool handles, ribs in boat building, cattle yokes, and the gourd is used for cups, containers and musical instruments. The calabash (C. cujete) fruit was studied for its chemical constituents-proximate and mineral composition as well as phytochemical properties. The sugar content, energy content, electrical conductivity and pH of the fruit were also determined. The value of the fat, protein, nitrogen, crude fibre, moisture content, sucrose, fructose, galactose and energy content are quite high viz; 1.13, 8.35, 1.34, 4.28, 84.92, 59.86, 25.09, 18.24 and 88.69%, respectively. The pH of the fruit falls within the acidic range (4.80) and the mean value recorded for the electrical conductivity was 163.24 mu S/cm. The results obtained for the mineral elements show that sodium and phosphorus have high mean concentrations, while low mean concentrations were recorded for others. Also, the results show relatively low mean concentrations for the heavy metals; but high mean concentrations for manganese, iron, zinc and copper. The presence of phytochemicals like saponins, flavonoid, cardenolides, tannins and phenol as well as the presence of hydrogen cyanide were observed in the fruit sample. The findings on the phytochemical constituents, mineral composition and proximate composition of the C. cujete suggest that the fruit can make useful contribution to both human and animal nutrition and possesses medicinal values.

The need to control and ultimately eradicate the scourge of metal corrosion has become necessary given the high incidence of deaths and loss of property resulting from it. The choice of π-conjugated organic systems has been justified in that they are easier to produce and their modes and rates of adsorption are very superb, a consequence of the π-electrons. In this work, a Schiff base of the reaction of aniline and salicyaldehyde was applied as corrosion inhibitor on mild steel via weight loss techniques (at different inhibitor concentrations and at different temperatures) from which the corrosion rate (Cr), degree of surface coverage (θ) and the percentage inhibition efficiency (%IE) were calculated. The molecule was modelled and optimized using Density functional theory (DFT) with B3LYP correlation and 6-31G* and 6-31+G* basis sets to obtain the electronic properties like the frontier molecular orbitals energies (EHOMO and ELUMO), energy band gap (Eg), dipole moment (μ) and the reactivity descriptors like chemical hardness (η), softness (δ), global electrophilicity index (ω) and fraction of electrons transferred (ΔN). The Cr increased with increase in temperature and decreased as the inhibitor concentration increases while the %IE followed a reverse pattern. From the R2 values, the molecule’s adsorption obeyed the Freundlich adsorption isotherm. ΔG values which turned negative confirmed that the reactions are exothermic and spontaneous. The results obtained are consistent with available experimental data.