Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 16: Femtosecond Spectroscopy II
MO 16.5: Talk
Thursday, March 12, 2020, 15:00–15:15, f102
Understanding ring-closing and ring-opening reaction of photochromic molecule fulgide in bulk crystal — •Soumyajit Mitra1, Simon.F Bittmann1, Scott Murphy2, Ajay Jha1, and R.J.Dwayne Miller1,3 — 1Atomically Resolved Dynamics Group, Max Planck Institute for the Structure and Dynamics of Matter, CFEL, Luruper Chaussee 149, 22761, Hamburg, Germany — 2Department of Chemistry and Biochemistry, Research and Innovation Centre, University of Regina, 3737, Wascana Parkway, Regina, SK S4S 0A2, Canada — 3Departments of Chemistry and Physics, University of Toronto, 80 St. George Street, Toronto, ON M5S3H6, Canada
Coupling of resonant light field with photochromic molecules (also known as molecular photoswitches) changes the orientation within the molecular structure, which gets manifested in differential optical or mechanical properties. The structural understanding of this photoswitching process holds the key to the rational design of next generation molecules. In this work, we are employing ultrafast transient absorption measurements in fulgide crystals to study complex interplay of different electronic states due to the presence of two possible reaction pathways: isomerization and electrocyclization. The role of lattice phonons in directing localized chemical reactions will be discussed. Our work pave the way towards understanding and thereby controlling of reaction pathways in complex molecules with multi-photoswitching centers.