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UID:20250917T132707EDT-5692LTvhgx@132.216.98.100
DTSTAMP:20250917T172707Z
DESCRIPTION: \n\nAbstract:\n\nPhotocages are chemical structures designed t
 o release molecules of interest upon exposure to light. The use of coheren
 t two photon excitation (2PE) using ultra-fast\, high-energy femtosecond l
 aser pulses focused in a femtoliter volume at twice the normal excitation 
 wavelength makes it possible to achieve high temporal and spatial resoluti
 on in 3D\, which is extremely valuable for applications in biology and mat
 erials science. However\, as the total number of molecules excited under t
 hese conditions is extremely small\, applications must rely on ultra-sensi
 tive detection\, such as 2PE fluorescence microscopy where it is possible 
 to detect single photons. This contribution will describe an amplification
  concept based on the use of adiabatic photocages capable of entering a qu
 antum chain reaction where hundreds of product molecules can be obtained f
 rom a single 2PE event. This is demonstrated with a novel adiabatic Dewar 
 benzene photocage where 2PE provides the initiation step for a triplet exc
 iton-enabled quantum chain that releases ca. 400 molecules of 7-hydroxycou
 marin. The latter serve both as 2PE antenna and as a 2PE fluorophore to de
 termine and optimize the experimental parameters needed to construct 3D mi
 croscopy images.\n\n \n\nBio:\n\nMiguel A. García-Garibay received his B.S
 . degree from the University of Michoacan\, Mexico and his Ph.D. from the 
 University of British Columbia with Professor John Scheffer. After his tim
 e as a postdoctoral fellow at Columbia University\, he joined the Departme
 nt of Chemistry and Biochemistry at UCLA\, where he is now Distinguished P
 rofessor. After various leadership positions\, he was appointed Dean of Ph
 ysical Sciences and Senior Dean of the UCLA College. He has served in edit
 orial boards of several American Chemical Society and the Royal Society of
  Chemistry journals and was an associate editor of Journal of the American
  Chemical Society. García-Garibay achieved international reputation for wo
 rk in reactive intermediates\, solid-state chemistry\, photochemistry\, an
 d for the development of amphidynamic crystals as a platform for molecular
  machines. He has authored over 250 articles and delivered over 350 lectur
 es across the globe. Among other honors\, he received the Inter-American P
 hotochemical Society Award\, the ACS Cope Scholar Award\, and the 2025 ACS
  James Flack Norris Award in Physical Organic Chemistry. He was elected fe
 llow of the American Association of the Advancement of Science\, fellow of
  the American Chemical Society\, member of the American Academy of Arts an
 d Sciences\, corresponding member of the Mexican Academy of Sciences\, and
  in 2023\, he was elected to the USA National Academy of Sciences.\n
DTSTART:20250909T170000Z
DTEND:20250909T183000Z
LOCATION:OM 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\, 
 801 rue Sherbrooke Ouest
SUMMARY:Chemical Society Seminar: Miguel A García-Garibay (Tomlinson Lectur
 e) Exciton-Enabled Quantum Chain Amplification in a Crystalline Two-Photon
  Adiabatic Photocage
URL:/chemistry/channels/event/chemical-society-seminar
 -miguel-garcia-garibay-tomlinson-lecture-exciton-enabled-quantum-chain-366
 998
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