MSE Colloquium, Francis Spano

  • Starts: 3:00 pm on Friday, September 28, 2018
  • Ends: 4:00 pm on Friday, September 28, 2018

Francis Spano

Temple University


Faculty Host: Sahar Sharifzadeh

Student Host:Aliya Mukazhanova

Refreshments at 2:45 PM

Expanded Theory of H- and J-Molecular Aggregates


The aggregated and crystalline phases of π-conjugated molecules and polymers continue to receive widespread attention as semiconducting materials for field effect transistors, light emitting diodes and solar cells. However, despite the more than five decades of intensive experimental and theoretical research following Kasha's pioneering work on H- and J-aggregates there remain important questions regarding the nature of the photo-excitations in molecular assemblies and how their spectral signatures are related to crystal packing and morphology. In this talk we show how vibronic signatures are often superior to signatures based on spectral shifts in identifying J- and H-aggregates. We further show how the theory of Kasha can be extended to account for intermolecular charge transfer. Applications are made to aggregated rylenes which have been intensively investigated as dye pigments and electron-transporting materials.


Frank C. Spano received an Associates in Science degree from Middlesex County College in 1980 and a B.S. in Engineering Physics from Lehigh University in 1982. He pursued Chemistry at Princeton University receiving a PhD in 1988 under the advisement of Warren S. Warren. He worked as a postdoctoral fellow for Shaul Mukamel at the University of Rochester from 1988-1990. He is currently a professor in the Department of Chemistry at Temple University.

15 Saint Mary's Street, Room 105

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