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In a series of complexes [(ttp)Ru{tpy(C6H4)ntpy}]2+, the Ru–tpy type chromophore and the free tpy site are separated by a variable number (n= 0–2) of phenylene spacers [tpy = 2,2′:6′,2″-terpyridine, ttp = 4′-(p-tolyl)-2,2′:6′,2″-terpyridine]; for the complex with n= 0, modulation of the luminescence properties of the Ru-based chromophore can be performed by protonation at the free tpy site suggesting a new approach for affording long-lived excited species of the basic Ru–tpy type unit.
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Barigelletti et al. (1996) studied this question.
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