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  1. 1 Acta Physica Polonica A

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  1. 1 1996

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  1. 1 Giannotti C.

  2. 1 Radzki S.

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Photochemical Reduction and Oxidation of Cerium(IV) Porphyrin Sandwich Complexes

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Radzki S., Giannotti C.
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Irradiation of cerium(IV) complex of octaethyl bisporphyrin Ce[OEP(-2]_{2} with visible light, in the presence of CCl]_{4} as an electron acceptor, leads to their photooxidation and π cation radical formation. The process was followed using electron absorption and magnetic circular dichroism spectroscopy. Electronic configuration in neutral mono- and bisporphyrin (sandwich) complexes were compared to the one of the neutral species. Photoirradiation of sandwich octaethyl- and tetraphenyl bisporphyrins, in the presence of an electron donor (triethylamine) results in their photoreduction on different pathways. Formation of the [Ce(III)(TPP)(-2)TPP(-2)]¯ and [Ce(III)(OEP)(-1)(OEP)(-2)] complexes was followed by absorption and electron spin resonance spectroscopy.
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