Archives: Downloads

ABSTRACT The  divalent metal chelates of  Mg,Co,Cu and Zn  with 4-acetyl (hpmap), 4- benzoyl(hpmbp),4-butyryl(hpmbup),4-capyroyl(hpmcp),4-propiony (hpmprp)   and   4-palmitoyl(hpmpp)   derivatives   of   1-phenyl   -3-methyl pyrazol-5-one have been  synthesized  and characterized by  UV ,IR,    and conductivity  measurements.  It  is  shown  that  the  ligands  behaved  like bidentate enols, all forming neutral chelates  with  the  metal ions , bonding through oxygen of the enolic hydroxyl group and  /or the  oxygen  atom of the carbonyl group of ...

ABSTRACT Dried and pulverised leaves of A. boonei De Wild (Apocynacea) were extracted using methanol for 48 h. The methanol  extract  obtained  was defatted  using  n-hexane  and  fractionated  using ethylacetate.   The  ethyl   acetate   fraction  of  the  extract   was   subjected   to  vacuum   liquid chromatography (VLC) in silica gel using gradients of hexane-ethyl acetate. The VLC fractions were further separated on Sephadex LH-20. A total of 10 compounds were successfully isolated and ...

CHAPTER 1 1.0       INTRODUCTION Ink is a liquid or paste that contains pigments and or/ dyes and is used to colour a surface to produce an image,  text or design.  Ink is used for drawing and / or writing with pen,  brush,  or quill. Thicker inks, in paste form, are used extensively in letter press and lithographic printing. Chemists  view it  as a colloidal system of fine pigment  particles  dispersed ...

ABSTRACT Zeolite crystals were synthesized by mixing sodium silicate and sodium aluminate to obtain aluminosilicate gel which was further treated hydrothermally to obtain the final product. The zeolite crystals were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD result identified the synthesized crystals as zeolite z; additional evidence was provided by the SEM images which showed that the zeolite crystals were disc-shaped and the particle sizes ...

ABSTRACT The inhibitive effects of bamboo leaves extracts (BLE) on the corrosion of aluminum in 1M HCl were studied using weight loss, adsorption, thermodynamics  and kinetic  studies. The phytochemical  constituents  of the  BLE  were  tannins,  polyphenols,  flavonols,  terpenoids, sterols and alkaloids.  BLE was noted to contain  more of the  polyphenols  and terpenoids which were largely responsible for the inhibitive action of the extracts. Results obtained from the experiments carried out ...

ABSTRACT 2-phenyl] iminomethyl]pheno 1   was synthesized from the condensation reaction of 1,3-diaminobenzene and 2-hydroxyzaldehyde  m dimethylformaldehyde  (DMF).  Its  coordination  characteristic  with  vanadium(III)  and vanadium(V)    complexes    was   studied    via,   UV/Visible,    IR   and   NMR    spectroscopy; stoichiometric,  melting  point  and  conductivity  determinations.  The  analytical  data  of these complexes  and the mode of bonding  show that, the ligand acted as a tetradentate  ligand via coordination through the two azomethine nitrogen and the two hydroxylic ...

ABSTRACT Five  species  of  Mushroom  namely  Termitomyces   robustus,  Agaricus  bisporus, Pleurotus tuber-regium, Amanita phalaoides and Amanita verosa were collected from eleven  locations  in  Uke,  Abatete,  Ideani,  Nnobi,  Nnewi  (Okpuno-egbu),  Nnewi (Umudim) and Ozubulu between 2009 and 2012 in Anambra State, Nigeria.   They were  kept  in  clean  collection  bags  and  identified  by a taxonomist.  Some  of the mushroom samples were later oven dried at 75 0 C for 4 hours and ...

ABSTRACT Concentrations of 16 priority polycyclic Aromatic Hydrocarbons (PAHs) were determined in 30 brands of Nigerian and imported pastas in Nigerian market. The pasta samples were categorised into (1) noodles (2) spaghetti and (3) macaroni. Analysis were performed by GC – MS after soxhlet extraction of the sample and clean up of the extract. The concentration of Σ16 PAHs in both the Nigerian and imported brands are in the range ...

ABSTRACT Synthesis   of twelve   O-arylated   diazabenzophenoxazine-5-one  and  its carbocyclic  analogue  is reported  in 46  -  99  % yields.    The  intermediates were  prepared  by  anhydrous  base  catalyzed  reaction  of 2,3-dichloro-1,4- naphthoquinone  with  4,5-diamino-6-hydroxyl-2-mercaptopyrimidine  and 2- aminophenol.   The  O-arylation   process   occurred   smoothly   in  non-polar solvent,   toluene    with   the   inexpensive    base,   KPO,   at    110C.    The intermediates  were combined with a variety of electron-deficient, electrically neutral and electron-rich phenols in the presence of a ...

ABSTRACT This project work present the alkylating reaction  of    with boronic acid alkylating agents.The reactivity of the metalloligand with the boron-functionalized alkylating agents BrCH2(C6H4)B(OR)2  (R = H or C(CH3)2) was investigated by electrospray ionization mass spectrometry (ESI-MS) in real time using the pressurized sample infusion (PSI). The macroscopic reaction of with  one  mole   equivalent of alkylating agents BrCH2(C6H4)B{OC(CH3)2}2and BrCH2(C6H4)B(OH)2   gave the dinuclear  monocationic  µ-sulfide thiolate  complexes +              and          .  ...

Abstract This  project  report  deals with  the  class of asymptotically  demicontractive mappings  in Hilbert spaces. We noted some historical aspects concerning the concept of asymptotically demicontractivity and  studied  a regularized  variant of the  Krasnoselskii-Mann  iteration scheme, which ensured the strong convergence of the generated sequence towards the least norm element of the set of fixed points of asymptotically  demicontractive mapping. Chapter  1 Introduction 1.1     General Introduction For the past  30 ...

ABSTRACT The efficacy of silica obtained from our local sand as a carrier in synthesis of Nickel-Silica catalyst  was  investigated.  Six  samples  of  soil  were  collected  from  two  different  sites (comprising five white coloured samples collected from Iva valley,  lower part of Milliken hill,   namely: pottery 2 (P2), down iva (DI), run-off iva (ROI),  pottery rock (POR), white chalk (WTC) and one brown coloured sample (UdS) collected from Udi Siding) ...

ABSTRACT A simple and sensitive spectrophotometric method is described for the assay of the drugs; niacin, glibenclamide, erythromycin, thiamine and 4-aminobenzoic acid.  The method is based on charge transfer complexation (CT) reaction of niacin, glibenclamide, erythromycin,  thiamine  and  4-aminobenzoic  acid  as  n-electron  donors  with  2,3- dichloro-5,6-dicyno-1,4-benzoquinone(DDQ) as л-electron acceptor in methanol. Intensely coloured charge transfer complexes with niacin (reddish brown, max ;464 nm; εmax, 1.02x103 dm3mol-1cm-1) thiamine (reddish brown ,max ...

ABSTRACT The  azo-ligand,   1,5-dimethyl-2-phenyl-4-- 1,2-dihydro-3H-pyrazol-3-one   (H3L)  and  its  Zn(II)  and  Cd(II)  complexes   have   been synthesized  and characterized  based on stoichiometric,  molar conductance,  electronic  and infra-red spectral studies. The results showed that H3L reacted with the metals in 2:1 ratio. H3L coordination was through the hydroxyl, azo and carbonyl groups to form 2+ and 2+  respectively.  Solvent  extraction  studies on Zn(II) and Cd(II) using  1,5- dimethyl-2-phenyl-4--1,2-dihydro-3H-pyrazol-3-one were carried out with  CHCl3. ...

ABSTRACT The groundwater quality indices of 12 randomly selected boreholes in Enugu North Senatorial  District  in  Enugu  State,  south-east  Nigeria  have  been  studied.  Using standard  methods by American  Public Health Association,  American  Water Works Association;   World   Environmental   Federation   (APHA-AWWA-WEF)    and   the Association of Official Analytical Chemists (AOAC), 22 physicochemical parameters were determined in triplicates at monthly intervals for three months in dry season and then  repeated  in rainy  season.  The ...

Abstract These  findings  documented  the  physical,   chemical  and  heavy  metal contents  in  leachate,  borehole water,  surface  stream,  treated  water and  soil  samples  around the  municipal  solid  waste  dumpsite  at Uyo metropolis,  Akwa-lbom State,  Nigeria.  Samples  were collected  during the wet and dry seasons  2010/2011.  The sam pies were analysed  for the following parameters:  heavy metals (Fe, Cu, Mn, Zn, Cr, Cd, Pb), anions (PO,SO~CI,  NO,,   NH',-N),  essential   metals  (Na,  K, ...

ABSTRACT Let H be a real Hilbert space and K a nonempty, closed convex subset of H.Let T : K → K be Lipschitz  pseudo-contractive map  with a nonempty  fixed points  set.  We introduce  a modified Ishikawa  iterative  algorithm  for Lipschitz  pseudo-contractive maps  and  prove that  our new iterative  algorithm  converges strongly  to a fixed point of T in real Hilbert space. Chapter  1 Introduction 1.1     General Introduction The  contribution ...

ABSTRACT Dyes from Pterocarpus osun Craib and Lawsonia inermis Linn. were extracted using ethanol and methanol respectively. The extracted dyes were subsequently purified using chromatographic methods. Purified pigments were characterized using Ultra-Violet Visible Spectrophotometer, Fourtier Transform Infrared Spectrophotometer and Lovibond Tintometer. The UV spectra of the dyes in petrol,  kerosene  and  diesel  showed  presence  of  chromophores.  The  FTIR spectra of the dyes showed presence of phenolic O-H stretching and C=C ...

ABSTRACT The syntheses of benzoxazinophenothiazine was thoroughly explored. Condensation of   2,3- dichloro-1,4-naphthoquinone with  2-amino-4-nitrophenol, 4,5-diamino-6-hydroxypyrimidin-2- thiol and 2-amino-6-chlorophenol, respectively in alkaline medium yielded the  intermediates: 6- chloro-10-nitrobenzophenoxazin-5-one(136), 11-amino-6-chloro-9-thiol-8,9- diazabenzophenoxazin-5-one (148) and 6,8-dichlorobenzophenoxazin-5-one (160). Further treatment of the intermediates with 2-aminothiophenol and 3-amino-6-methoxypyridin-2-thiol gave the complex derivatives: 14-nitrobenzobenzoxazinophenothiazine (137), 15- amino-13-thiol-12,14-diazabenzobenzoxazinophenothiazine (149) and 12-chloro- 9-methoxy-8-azabenzobenzoxazinophenothiazine (161). The compounds were characterized by UV/Visible, FT-IR, (1H and 13C-NMR) spectroscopy and elemental analysis. The ...