II. “Spectroscopic Investigation of Charge Transfer Complexes of Osazone Intermediates Prepared From certain monosaccharides” |
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Authors: | Sobhy M El Adl Afaf Abul-Kheir Saied Belal Magda Ayad |
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Institution: | Department of Pharmaceutical Chemistry, Faculty of Pharmacy , Zagazig University , Zagazig , Egypt |
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Abstract: | Monosaccharide osazones are utilized in the spectrophotometric determination of their parent compounds through charge transfer complexes (CTC) formation with three-electron acceptor reagents. These acceptors indlude iodine (as -π-acceptor) and chloranil (tetrachloro P-benzoquinone) & TCNE (tetracyano ethylene) as π-acceptors. The presence of two phenylhydrazone moieties in the osazone molecule imparts electron-donating properties toward electron-accepting reagents, yielding spectrophotometrically measurable complexes. However, the reaction of osazone intermediates with TCNE reagent gave tricyanovinyl derivative rather than CTC formation. The above complexes together with their corresponding intermediates were subjected to structure elucidation studies to confirm the results and conclusions obtained. These studies include IR, Raman spectra, H1, C13-NMR, MS, ESR (electron spin resonance spectra) and microanalysis. |
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Keywords: | Uv/Vis IR H1 C13 - NMR MS ESR microanalysis osazones monosaccharides iodine cholranil TCNE charge transfer complexes (CTC) |
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