Determination of rotational dynamics at the air/ D2O interface by time resolved second harmonic generation

CHED 1389

Krystal Brown, brownkry@ccsu.edu1, Kenneth B. Eisenthal, kbe1@columbia.edu2, and Eric McArthur2. (1) Central Connecticut State University, 1615 Stanley Street, New Britain, CT 06050, (2) Department of Chemistry, Columbia University, 3000 Broadway, Mail Code 3107, New York, NY 10027
Molecular behavior at liquid interfaces is of interest to many areas of research, including cell membrane and drug behavior. Because of the asymmetric nature of forces at the interface, rotational motions here differ significantly from those in the bulk. Second harmonic generation (SHG) provides a surface selective method that allows interfacial phenomenon to be distinguished from the bulk liquid. Using SHG, the out-of-plane and in-plane reorientation time of the dye coumarin 314 (C314) at the air/H2O interface have been previously found to be 336 ± 6ps and 275 ± 12ps, respectively. We are presently extending this work by investigating isotope effects on C314 reorientation via the air/D2O interface.
 

Undergraduate Research Poster Session: Physical Chemistry
2:00 PM-4:00 PM, Monday, March 26, 2007 Hyatt Regency Chicago -- Riverside Center, Poster

Division of Chemical Education

The 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007