Photochemistry and Photophysics of Coordination Compounds

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164 S. Campagna et al. efficient, which confirms that in this type of artificial antenna metallodendrimer, long-range electron transfer can be quite effective, as in the case of the heptanuclear complex mentioned above [264], and could suggest interesting options to build up integrated donor–antenna–acceptor systems. This discussion leads us directly to the next section. 5.3 Donor–Chromophore–Acceptor Triads Triad systems (Fig. 14) are key components of the early events in artificial photosynthesis: the light energy collected by the chromophore (P) is transformed into chemical (redox) energy by a sequence of electron transfer steps involving electron donor (D) and electron acceptor (A) units, ultimately leading to charge separation [208, 209, 228]. Charge separation is probably the most important photoinduced process on Earth, so it is not surprising that many triads based on Ru(II) complexes have been prepared and studied in the last 20 years [228, 280]. It should be noted that there are literally dozens of dyads based on Ru polypyridine complexes [228, 281]. Only some examples of triads (that is, species where Ru(II) chromophores are simultaneously coupled to electron donor and acceptor units) are discussed here.
Photochemistry and Photophysics of Coordination Compounds: Ruthenium 165 Fig. 14 Schematization of a triad for photoinduced charge separation. P, chromophore; D, donor; A, acceptor; cs, primary charge separation; cr, primary charge recombination; cs ′ , secondary charge separation; cr ′ , final charge recombination Structurally speaking, Ru complexes with tridentate ligands like terpy are ideal systems for molecular triads: indeed, substitution at the 4 position of the central pyridine ring of terpy-like ligands allows a linear arrangement of subunits, with control of geometry and distance. Some of the first ruthenium triads based on such an arrangement are shown in Fig. 15 [282]. Whereas fully developed charge separation, with formation of the D + -P-A – Fig. 15 Structural formulae of Ru(II) terpyridine triads containing acceptor (A) and donor (D) components
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280 Topics in Current Chemistry Edi
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Photochemistry and Photophysics of
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Topics in Current Chemistry Also Av
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X Preface nation Compounds. The ven
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Contents Photochemistry and Photoph
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Subject Index Alkyne bridges 148 An
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Subject Index 273 Rh(III) cyclometa
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