L202
Multifunctional Transition Metal Complexes: from Photoactive Molecular-scale Wires to Photochemical Cation Sensing
Raymond Ziessel
Universit Louis Pasteur
We describe compelling experimental evidence that polyacetylene spacers operate as extremely effective molecular-scale wires for conducting electronic charge between photoactives terminals. We consider various synthetic strategies for the engineering of systems that retain the favorable electronic properties of polyacetylenes and include a relay or an insulator in the bridging moiety. By careful design of the system we have introduce directionality and selectivity into the photoactive dyads and we were able to modulate the rate of triplet energy transfer by 3 to 4 order of magnitude. Similar effects can be obtained with polycyclic hydrocarbons built into the acetylenic wire and, in such cases, the energetics of the bridge can also be tuned over an inordinately wide range by varying the extent of conjugation inherent to the aromatic nucleus. A special case is identified in which the polycycle itself possesses vacant coordination sites since the energy of the bridge can be further modulated by external complexation of adventitious cations.
In the present presentation we will focus on recent progress made in our laboratory regarding to the assembly of photoactive multicomponent systems comprising a short polyacetylenic bridge containing adventitious structural units for information transfer under external stimulation.
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