title: Time resolved structural dynamics of butadiyne-linked porphyrin dimers.
abstract: 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 the addition of a ligand, provides conclusive evidence for the twisting motion performed by the porphyrin dimer in solution.
authors.forename: Franco V A
authors.initials: FV
authors.lastname: Camargo
authors.affiliation: School of Chemistry, Norwich Research Park, University of East Anglia , Norwich NR4 7TJ, United Kingdom.
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Hall
authors.affiliation: Department of Chemistry, University of Oxford , Chemistry Research Laboratory, Oxford OX1 3TA, United Kingdom.
authors.forename: Harry L
authors.initials: HL
authors.lastname: Anderson
authors.affiliation: School of Chemistry, Norwich Research Park, University of East Anglia , Norwich NR4 7TJ, United Kingdom.
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Meech
authors.affiliation: School of Chemistry, Norwich Research Park, University of East Anglia , Norwich NR4 7TJ, United Kingdom.
authors.forename: Ismael A
authors.initials: IA
authors.lastname: Heisler