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UID:20250819T072712EDT-8534SAudFj@132.216.98.100
DTSTAMP:20250819T112712Z
DESCRIPTION:Electronic and optoelectronic devices based on soft organic and
  biological polymers may change the way we maintain our environment\, gene
 rate energy and treat otherwise incurable health conditions\, for example\
 , brain trauma. The rational design of such devices is hindered because th
 e relationship between morphology and electronic and optoelectronic behavi
 ours of conjugated or biological polymers is\, in general\, poorly underst
 ood. In this talk\, I will describe two of our recent results that offer h
 elpful insights into this complex relationship: (1) We have demonstrated t
 heoretically that torsional disorder in substituted polythiophenes can pol
 arize the excited electron-hole pairs (excitons)\, and observed this effec
 t directly using single-molecule spectroscopy experiments in a\n	(theory-dr
 iven) collaborative effort. Of particular practical interest is our findin
 g that exciton polarization in conjugated polymers can be controlled with 
 non-bonding interactions\, for example\, with strategically chosen side-ch
 ains\; this insight may help manipulate the mechanism of exciton diffusion
  and charge-separation in organic photovoltaics\; (2) We have developed a 
 minimal theoretical framework\, which captures in a crude but cost-effecti
 ve and intuitive way the effects of morphology on fluorescence brightness 
 in a class of fluorescent proteins (Tsien's Class 2). The goal of this wor
 k is to guide the rational design of fluorescent bio-sensors\, which can d
 etect rearrangements of target proteins via interdomain allostery. As an a
 pplication\, we used this framework to propose a consistent mechanism of a
  genetically encoded voltage indicator ArcLight\, whose mechanism is curre
 ntly under debate.\n
DTSTART:20180419T170000Z
DTEND:20180419T183000Z
LOCATION:Room 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\
 , 801 rue Sherbrooke Ouest
SUMMARY:Special Chemistry Seminar: Lena Simine - Relating morphology and op
 tical response in soft optoelectronic materials
URL:/chemistry/channels/event/special-chemistry-semina
 r-lena-simine-relating-morphology-and-optical-response-soft-optoelectronic
 -286623
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