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Abstract
Developing
chemosensory devices selective for transition metals and other pollutants
represents a critical need for the environmental community. Fluorescent
conjugated polymer chemosensors have several advantages over small molecule
sensors due to their high sensitivity, processibility, and ease of
modification. Previously, our group has synthesized a series of fluorescent
polymerchemosensors with a
poly[p-(phenyleneethylene)-alt-(thienyleneethynylene)](PPETE) conjugated
backbone. The transition metal loading dependence of these materials provides
fundamental information regarding the role of energy transfer in the
fluorescent chemosensor quenching mechanism. Recently, this work has been extended
by addition of a N,N,N’-trimethylethylenediamino receptor group which undergoes
photoinduced electron transfer (PET) to the polymer exciton. Upon binding to
analytes such as protons or some transtion metal cations, the PET process is
disabled and the emission from the polymer is enhanced. This system has been
found to be particularly sensitive to Hg2+ ions that cause the fluorescence of
the polymer to increase by a factor of ~ 2.7. Synthesis, characterization and
photophysical behavior of this polymer will be discussed as well as its
application to future “Turn-on” sensor designs.
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Meeting
Location: Ecolab Schuman Research Center, 655 Lone Oak Dr, Eagan, MN. Downloadable Maps and Directions
available at www.mnacs.org. Please note the meeting entrance will
be the door serviced by the 1st stairway as you enter the
northern section of the parking lot.
There is a “Bldg. E” sign at the service road – this is the proper
entrance. You will need to sign in
at the Security Desk before being admitted. No walk-in admissions will be allowed; you must have
an RSVP!
Meeting
Schedule:
Executive
Meeting: 5:30-6:30 pm in Cafeteria “Horseshoe”
Dinner:
6:30 pm -7:30 pm in the Cafeteria
Presentation:
7:30 pm - 8:30 pm in the Cafeteria
Dinner/cost:
Whiskey
Sirloin with Roasted Garlic Sauce, or vegetarian option, roasted red potatoes,
fresh hot vegetables, green salad with assorted dressings, assorted pie,
coffee, water, soda, milk. Cost of
dinner is $20, payable at the door, or pay only $18 by pre-paying online by the
October 8th deadline at http://www.mnacs.org/meetings/nextmeeting.html.
Reservations: Register online below, or leave a detailed message at
651-795-6615 by COB October 8th.
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