Phenanthroline-polyoxometalate hybrid compounds and the observation of intramolecular charge transfer |
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Authors: | Bar-Nahum Itsik Narasimhulu K V Weiner Lev Neumann Ronny |
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Institution: | Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel 76100. |
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Abstract: | A phenanthroline ligand has been covalently modified at the 2 and 9 positions by an aminophenylhexamolybdate substituent. The 1H NMR spectrum indicated a strong electron-withdrawing effect of the hexamolybdate (Mo6O19(2-)) moiety on the phenanthroline ligand. UV-vis and cyclic voltammetry showed extended conjugation of the hybrid phenanthroline-polyoxometalate compound and the possibility of easy oxidation of the extended phenanathroline ligand. Further EPR experiments provided strong evidence for an intramolecular charge-transfer process with the formation of a phenanthroline cation radical and a reduced hexamolybdate. |
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