Spin adducts of group IVB organometallic radicals with Thioketones. an esr study |
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| Authors: | Angelo Albert Francesco Paolo Colonna Maurizio Guerra Bianca F Bonini Germana Mazzanti Zoltàn Dinya Gian Franco Pedulli |
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| Institution: | Instituto dei Composti del Carbonio Contenenti Eteroatomi e loro Applicazioni, Consiglio Nazionale delle Ricerche, Via Tolara di sotto 89,40064 Ozzano Emilia Italy;Instituto di Chimica Organica dell''Università, Viale Risorgimento 4,40136Bologna Italy;Institute of Organic Chemistry, University of Debrecen, H-4010 Debrecen Hungary;Instituto Chimico dell''Università, Via Ospedale 72,09100 Cagliari Italy |
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| Abstract: | The radical adducts resulting from the reaction between group IVB organometallic radicals MR3 (M = Si, Ge, Sn; R = alkyl or aryl) and a number of thioketones of the chromone and flavone series have been investigated by ESR spectroscopy. The spectral parameters obtained for these species have been compared with those of similar adducts of the corresponding ketones. Both classes of radicals adopt an orthogonal conformation, and the differences between the former and the latter paramagnetic species can be accounted for by the different electronegativity of oxygen and sulphur. the effects of substitution of the heterocyclic oxygen with a sulphur or selenium atom on the spin density distribution are likewise explained. INDO calculations have been carried out on the model systems CH2XSiH3 (X = O, S). |
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