Energy transfer studies on ruthenium polypyridines using transient absorption spectroscopy

ALEJANDRO CADRANEL

Sarasota

Conferencia; Inter American Photochemical Society Winter Meeting; 2019

Inter American Photochemical Society

Photoinduced energy transfer processes are essential steps for energy conversion in biological systems and technological devices. Supramolecular donor-acceptor systems are attractive to model such processes, since their geometrical and electronic properties can be tailored by synthetic design. Using ultrafast transient absorption spectroscopy, we have studied energy transfers using ruthenium polypyridines as energy donors, and hexacyanochromate as the energy acceptor, in a variety of cyanide-bridged, multimetallic coordination complexes. Two cases will be discussed in detail: on one hand, trimetallic systems that contain a {Ru(py)4} chromophore, which is able to transfer the energy although ligand field states play a major role.[1,2] On the other hand, an asymmetric trimetallic complex where coexisting MLCT excited states present differentiated energy transfer activity depending on their symmetry.[3-5][1] Cadranel et al., Inorg. Chem. 2018, 57, 3042. [2] Cadranel et al., Dalton Trans. 2016, 45, 5464. [3] Cadranel et al., Chem. Sci. 2017, 8, 7434.[4] Oviedo et al., submitted to J Phys Chem C[5] Oviedo et al., in preparation.