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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 ...

ABSTRACT A simple and sensitive spectrophotometric  method for  the determination of paracetamol was explored, using zirconium(IV)  and vanadium(V)  oxides. The method was based on the oxidation of paracetamol by zirconium(IV) and vanadium(V)   m     alkaline  and  acidic  media  respectively.  The   stoichiometric studies indicated  a mole-ratio of  1: 1   for  the reactions of paracetamol  with both zirconium(IV)  and vanadium(V).  Effects  of other variables like  pH,  temperature and  time   were  determined  and  showed ...

ABSTRACT This work studied the effect of the binary and ternary combinations of pine needle (Pinus pinaster ) dust and bambara nut (Vigna subterranea) chaff with coal dust for briquette production. Briquettes of 100% of the pure coal and the biomass were produced first. The ratios for the blending were as follows 1:1 for the binary combination of each biomass with coal and with themselves, and 1:1:1 for the ternary ...

ABSTRACT The synthesis of N-heteroaryl substituted benzene sulphonamides and evaluation of their biological activities are reported. Synthesis was achieved by the reaction of benzene sulphonyl chloride  and  substituted  amino  heterocycle  in  dry pyridine.  The  structures  of  synthesized compounds were assigned by spectroscopic methods. The eight (8) synthesized compounds were evaluated for antibacterial and antifungal activities. The results showed that some of the new compounds exhibited activities comparable to ciprofloxacin and ...

ABSTRACT Zinc Oxide (ZnO) nanowires with hexagonal structure were successfully synthesized by chemical bath deposition technique. The obtained nanowires were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and spectrophotometer. The SEM micrographs revealed the morphology of ZnO nanowires with diameter between 170.3 and 481nm and showed that the pH of the bath solution, 8.1 is the optimized value to form ZnO nanowires with ...

ABSTRACT The Schiff base ligand, 2-phenyl}imino)methyl]phenol was synthesized by condensing 1,3-diaminobenzene and 2-hydroxybenzaldehyde in absolute ethanol.  Its  Cr(III)  and   Cr(VI)  complexes  were  equally  synthesized.  The  ligand   was characterized via UV, IR and NMR spectroscopy, whereas the complexes were characterized based on UV and IR spectroscopy and conductivity values. Stoichiometric studies indicated 1:1 metal to ligand ratio for both complexes. Cr(III) complex absorbed at 1042.56 cm-1  υ(C-O), 532.37 cm-1 υ(Cr-N) and ...

ABSTRACT The  synthesis  of  new  angular  aza  phenothiazinones,  angular  azaphenoxazines  and  their derivatives are reported. Two key functional intermediates namely 2,6-diamino-4-chloro- pyrimidin-5-thiol and 7-chloro-5,8-quinolinequinone were successfully synthesized from readily available starting materials using such traditional organic methods as nitrosation, nitration, halogenation, reduction, oxidation, direct thiocynation and base-catalyzed hydrolysis. The new angular azaphenothiazinones and angular azaphenoxazinone were prepared by coupling the requisite intermediates. Condensation reaction between 2,6-diamino-4-chloro-pyrimidin-5-thiol or 2-aminothiophenol or 2-aminophenol ...

ABSTRACT Let H  be a real Hilbert  space and  K  a nonempty,  closed and  convex subset  of H.  Let T : K  →  K  be an asymptotically  nonexpansive  map with a nonempty  fixed points  set. n=1   Let {αn}∞ and  {tn}∞ be real sequences in (0,1).  Let {xn} be a sequence generated from an arbitrary x0  ∈ K by n=1         yn = PK ,       n ≥ 0 n=1 ...

ABSTRACT The  synthesis  of  five  mono-  and  five  bis-alkynylated  derivatives  of  quinoline-5,8-diones  is reported.  The  intermediate  6,7-dibromoquinoline-5,8-dione  was  obtained  by  nitrosation  of 8- hydroxyquinoline, followed by reduction and subsequent bromination and oxidation. The coupling reaction  of  6, 7-dibromoquinoline-5 ,8-dione  via  palladium-catalyzed  Sonogashira cross-coupling gave the alkynylated   products.  The chemical structures of the products were confirmed using spectroscopic  methods which include UV-visible spectrophotometry,  Fourier Transform-Infrared (FT-IR)  spectroscopy,   'H   and  'C-NMR  spectroscopy.   ...

ABSTRACT The kinetics and mechanisms of the redox reactions of   µ-oxo-bridged iron(III) complex ion Na4.12H2O denoted as Fe2 O4+, with the thiols-2-mercaptobenzothiazole(MBSH), 2- mercaptophenol(PhSH), 2-mercaptoacetic acid (MSH), and l-cysteine (RSH) have been investigated in  aqueous perchloric   acid medium at =1×10-4  mol dm-,3,I=0.05mol dm-3(NaClO4) and at T =27.0±0.1oC. The reactions were monitored under pseudo-first order condition .The rate of reaction was first-order in reductant and oxidant for all the systems giving ...

ABSTRACT The composition and bleaching properties of Nteje clay in comparison with two commercially available  adsorbents  (activated  carbon  and  fuller’s  earth)     were  investigated  to  study  its competence for use as an alternative to high cost imported adsorbents. The modification of the raw clay sample was carried out by acid activation to enhance the surface area of the clay by exchange of octahedral cations e.g Al3+, Fe3+ and Mg2+   with H+ ...