Muthana A. Shanshal

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The vibration spectra of polyaromatic hydrocarbon cations gain increasing importance due to their presence in interstellar spaces and their expected ecological importance. Efforts were made to study their spectra both experimentally and theoretically. As for the phenanthrene radical cation, Hudgins and Allamandola [1] studied its vibration spectrum,(More)
Electrochemical polarographic measurements done for mixtures of the ubiquinone,0 (Ub,0) and Ubiquinone,10 (Ub,10) in their monomeric form (c < 10−5 mol/l) with nucleosides and nucleic acid bases show that their half wave potentials, E1/2, as well as limited diffusion currents, id, decrease as functions of the concentrations of the added components. The(More)
The in teract ion of the quinol ine der iva t ives wi th CoQio is s tudied b o t h exper imenta l ly , using Polarographie a n d spec t ropho tomet r i c techniques , a n d theoret ical ly, app ly ing the p e r t u r b a t i o n molecular orbi ta l theory . The Ei /z po ten t i a l s of a series of 1 :1 solution mix tures of quinoline der iva t ives wi th(More)
Crystalline coenzyme Q (CoQ) was obtained from Leishmania donovani promastigotes by extraction of the unsaponifiable material with hexane, chromatography on a Florisil column and crystallization from ethanol. Crystalline CoQ in ethanol revealed an ultraviolet-peak, at 275 nm, which disappeared upon reduction with NaBH4. Polarographic and mass(More)
UV spectrophotometric measurements were done on mixtures of the ubiquinones Ub,0 and Ub,10 in their monomeric form (c < 10−5 mol/l) with the nucleosides; adenosine, cytidine, 2′-desoxyadenosine, 2′-desoxy-quanosine, guanosine and thymidine, as well as the nucleic acid bases; adenine, cytosine, hypoxanthine, thymine and uracil. Applying the Liptay method, it(More)
The molecular orbital energies of some conjugated cyclopropyl derivatives are evaluated using 2nd order perturbation. The basis includes the Hiickel MOs of the conjugated segment and the Walsh MOs of cyclopropane. The obtained MO sequence is used to discuss the UV absorption spectra of the molecules. It is found that the absorption bands of most of these(More)
MINDO/3-FORCES calculations were carried out for the radical ions of benz[a]anthracene. Both ions exhibit Cs symmetry with C-C bond alternation in all four rings. The obtained equilibrium geometry was applied for the calculation of all 3N −6 vibration frequencies of each ion, and for the analysis of their normal coordinates. The so calculated frequencies of(More)
B3LYP density functional treatment is reported for the [3]to [6]-radialene. For the first two molecules the corresponding Dnh symmetry resulted from the treatment. For the [5]-radialene, the completely planar D5h structure was found energetically a non-minimal configuration showing two imaginary vibrations. An almost planar C1 structure of [5]-radialene(More)
The structure of the title compound, [CrCl2(C2H6OS)4]Cl·C2H6OS, consists of a Cr(III) ion coordinated by four O atoms of dimethyl sulfoxide (DMSO) ligands and two chloride ions in cis positions, forming a distorted CrCl2O4 octa-hedron. An isolated Cl(-) counter-anion and a positionally disordered DMSO mol-ecule [occupancy ratio 0.654 (4):0.346 (4)] are also(More)
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