B. B. Adeleke
University of Ibadan
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Featured researches published by B. B. Adeleke.
Journal of the Chemical Society, Faraday Transactions | 1976
B. B. Adeleke; J. K. S. Wan
CIDEP in the photoreduction of various quinones by 2,6-di-t-butylphenol in solution was observed. The dependence of polarization on individual hyperfine lines as well as on g factor difference was systematically studied. Experimental facts point to the coexistence of both the radical pair and the phototriplet mechanisms in these quinone systems with the phototriplet mechanism being the major contributor to the observed CIDEP. The isotope effect in the photoreduction supported the phototriplet mechanism.
Food Chemistry | 1985
Rotimi A. Oderinde; A.O. Jiboku; J.A. Faniran; B. B. Adeleke
Abstract Nine different species of mushroom were analysed spectrometrically for their vanadium contents. It was found that some edible species of mushroom, such as Agrocybe and Leutinus , contain vanadium in amounts either comparable with, or higher than, the amounts in some poisonous species. The result suggests that there is no correlation between the vanadium content of the mushroom species examined and their toxicity.
Journal of Physical Chemistry & Biophysics | 2015
Collins U. Ibeji; Isaiah A. Adejoro; B. B. Adeleke
The geometric, thermodynamic, electronic and absorption properties of Pyrrole and some of its derivatives have been carried out using CCSD/6-311++G(d,p)/STO-3G, TD-DFT and DFT/B3LYP/6-31G(d) from monomer to five repeating units. Substitution by a methyl group at C3 and functional groups at C4 cause small changes in atomic distances. The estimated inter-ring bond length based on Badgers rule of 1.41 A indicates that the average structure is about 30% quinoid. The geometries indicates that strong conjugate effects and effective aromatic structure are formed in the order Pyrrole>MPCam>MPC. The oligomers of simulated compounds have been extrapolated to polymer through second-degree polynomial-fit equation with r2 value ranging from 0.96-0.99. Calculated band gap of pyrrole, which is 2.9 eV, significantly correlates with the experimental value which ranges from 2.9-3.2 eV and this corresponds to π-π* transition energies. Natural bond orbitals of polypyrrole reveals that the wavefunctions contain dynamic correlations (single reference), closed shell character while substituted polypyrrole are multireference (static correlation), open shell character.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 1988
A.O. Jiboku; B. B. Adeleke
Abstract 13 C NMR spectra of thiophenol, 4-nitrothiophenol, 4-X-thioanisole (X = NO 2 , NH 2 , SH, H) were examined in CDCl 3 solution. Substituent chemical shift values (additivity parameters) for the −SH and −SCH 3 groups are reported. In para -substituted thioanisoles, while the −NH 2 group caused a deshielding and −NO 2 a shielding of SCH 3 carbon resonance, −SH appeared to have had no effect on the carbon resonance.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 1985
B. B. Adeleke
Abstract Radical intermediates obtained in the photoreduction of 2,6-dimethyl-γ-pyrone, γ-pyrone-2,6-dicarboxylic acid and its anion have been identified by the ESR technique. Persistent secondary radicals were observed in the chelidonic acid system. While carbon centred radicals add to the ethylenic bond of the heterocyclic compounds, organometallic radicals preferentially add to the oxygen of the carbonyl group.
Journal of Coordination Chemistry | 1982
B. B. Adeleke; K.S. Patel
Abstract The ESR spectra of seventeen oxovanadium(IV) β-diketonates in chloroform solution have been examined in order to study the effect of various substituents. Bis[4,4,4-trifluoro-1-(3-pyridyl)-1,3-butanedionato]oxovadium(IV) which is tetrameric in chloroform solution gave an ESR spectrum suggestive of a species with a long rotation correlation time. Both 3-chloro and 3-methyl substituents increase the in-plane ligand field in VO(3-Clacac)2 and VO(3-CH3acac)2 while p-methoxyphenyl substituent which has the highest possible mesomeric interaction among the substituents gave the lowest isotropic splitting factor.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 1985
B. B. Adeleke; Rotimi A. Oderinde; J.A. Faniran
Abstract The addition of PO2−3, CO−2 and SO−4 radicals to the trans—trans muconate anion was studied by electron spin resonance spectroscopy. While CO−2 and SO−4 add exclusively to the terminal carbons of the muconate anion, PO2−3 adds to both C1 and C2 carbon atoms. The preferential addition of free radicals to the terminal carbons is consistent with the higher free valence index of the terminal carbons.
Geochemical Journal | 2007
A. Akinlua; T. R. Ajayi; B. B. Adeleke
Journal of Petroleum Geology | 2005
A. Akinlua; T. R. Ajayi; D. M. Jarvie; B. B. Adeleke
Journal of Petroleum Science and Engineering | 2006
A. Akinlua; T. R. Ajayi; B. B. Adeleke