Science, Technologies, Engineering,
& Mathematics (STEM) Academy

 

Chemistry Department Seminar Series &

STEM ACADEMY

Presents
Dr. Wayne E. Jones Jr.
State University of New York at Binghamton

Fluorescent Conjugated Polymer Chemosensors for the Environment Based on Inorganic-Organic Hybrid Structures

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 polymer chemosensors 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 transition 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.

Friday, February 7th, 2014
Time: 1:00 PM
Location: M-136

The event is sponsored by CSTEP Club, Chemistry Club, Biology Club, STEM Research Club, Science Research Alliance Club and Haitian Club

All are invited to attend, QCC ID Required.
Light refreshment will be served after the seminar.