Time resolved structural dynamics of butadiyne-linked porphyrin dimers

Franco V. A. Camargo, Christopher R. Hall, Harry L. Anderson, Stephen R. Meech, Ismael A. Heisler

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In this work the timescales and mechanisms associated with the structural dynamics of butadiyne-linked porphyrin dimers are investigated through time resolved narrowband pump / broadband probe transient absorption spectroscopy. Our results confirm previous findings that the broadening is partly due to a distribution of structures with different (dihedral) angular conformations. Comparison of measurements with excitations on the red and blue sides of the Q-band unravel the ground and excited state conformational re-equilibration timescales. Further comparison to a planarized dimer, through addition of a ligand, provide conclusive evidence for the twisting motion performed by the porphyrin dimer in solution.
Original languageEnglish
Article number023608
Number of pages12
JournalStructural Dynamics
Early online date14 Jan 2016
Publication statusPublished - Mar 2016

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