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Dive into the research topics where B. B. Adeleke is active.

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Featured researches published by B. B. Adeleke.


Journal of the Chemical Society, Faraday Transactions | 1976

Chemically induced dynamic electron polarization. Part 8.—Simultaneous operations of the radical-pair and photoexcited triplet mechanisms in the photolysis of substituted benzoquinone, naphthoquinone and anthraquinone

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

A spectroscopic study of vanadium in mushroom

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

A Benchmark Study on the Properties of Unsubstituted and Some Substituted Polypyrroles

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

13C nuclear magnetic resonance studies of some substituted thiols and thioanisoles

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 SCH 3 carbon resonance, −SH appeared to have had no effect on the carbon resonance.


Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 1985

Electron spin resonance study of the photoreduction and organometallic adducts of some substituted γ-pyrones

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

ELECTRON SPIN RESONANCE STUDY OF SUBSTITUENT EFFECTS IN OXOVANADIUM(IV) β-DIKETONATES

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

ESR study of radical addition reaction of the trans-trans muconate anion

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

Organic and inorganic geochemistry of northwestern Niger Delta oils

A. Akinlua; T. R. Ajayi; B. B. Adeleke


Journal of Petroleum Geology | 2005

A RE‐APPRAISAL OF THE APPLICATION OF ROCK‐EVAL PYROLYSIS TO SOURCE ROCK STUDIES IN THE NIGER DELTA

A. Akinlua; T. R. Ajayi; D. M. Jarvie; B. B. Adeleke


Journal of Petroleum Science and Engineering | 2006

Niger Delta oil geochemistry: Insight from light hydrocarbons

A. Akinlua; T. R. Ajayi; B. B. Adeleke

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A. Akinlua

Obafemi Awolowo University

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T. R. Ajayi

Obafemi Awolowo University

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