Efficient Convergent Energy Transfer in a Stereoisomerically Pure Heptanuclear Luminescent Terpyridine-Based Ru(II)–Os(II) Dendrimer
Résumé
The stereoisomerically pure synthesis of a novel heptanuclear
Ru(II)−Os(II) antenna bearing multitopic terpyridine ligands is reported. An
unambiguous structural characterization was obtained by 1H NMR spectroscopy
and ion mobility spectrometry (IMS-MS). The heptanuclear complex
exhibits large molar absorption coefficients (77900 M−1 cm−1 at 497 nm) and
undergoes unitary, downhill, convergent energy transfer from the peripheral
Ru(II) subunits to the central Os(II) that displays photoluminescence with a
lifetime (τ = 161 ns) competent for diffusional excited-state electron transfer
reactivity in solution.