PHOTOPRODUCTION OF HYDROGEN FROM LINKED CHROMOPHORES |
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| Authors: | I I CREASER A HAMMERSHØI A LAUNIKONIS A W-H MAU † A M SARGESON † W H F SASSE |
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| Institution: | Research School of Chemistry, Australian National University, Canberra, Australia;H. C. Ørsted Institute, University of Copenhagen, Denmark;CSIRO, Division of Applied Organic Chemistry, Melbourne, Australia |
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| Abstract: | Abstract On irradiation of solutions of anthryl-substituted cobalt(III) cage complexes, (l-(anthryl-9-methylamino)-8-methyl-3,6,10,13,16,19-hexaazabicyclo 6.6.6] eicosane) cobalt(III)]3+ or (l-(4-an-thryl-9)-3-aza-butyl-l-amino)-8-methyl-3,6,10,13,16,19-hexaazabicyclo 6.6.6] eicosane)cobalt (III)]3* in the presence of ethylenediaminetetraacetic acid and platinum catalysts hydrogen was produced. These complexes act as coupled photosensitizers (anthracene moiety) and electron relays (cobalt cage) to produce H2 via energy trapping and intramolecular electron transfer initially. The intensity of fluorescence and the photochemical reactivity favour the latter complex and the excited singlet state of the anthracene chromophore is invoked as the intermediate state leading to the reduction of Co(III) to Co(II). |
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