E.S.R. spectra of X-irradiated methylene diphosphonic acid |
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| Authors: | M. Geoffroy L. Ginet E.A.C. Lucken |
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| Affiliation: | Department de Chimie Physique , Ecole de Chimie , 30 quai de l'Ecole de Médecine, 1211, Genève, Suisse |
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| Abstract: | X-irradiation of single crystals of methylene diphosphonic acid gives rise to E.S.R. spectra which have been assigned to (OH)2(O)P-?H2 and  The former species is the more abundant of the two and the methylene group undergoes rapid re-orientation about a two-fold axis at room temperature but is stationary at 77 K. The 1H and 31P coupling constants in this radical are very similar to those in Ph3P+CH2, and support the previous conclusions [1] that there is little delocalization of the unpaired electron to the phosphorus atom. |
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