Investigation of spin lattice relaxation (T1) of n-propyl benzoate in various solvents

CHED 289

Elise Serembus, elise.serembus@wilkes.edu, Faith Wydra, Kate Willis, Samantha Payne, and Donald E. Mencer, mencer@wilkes.edu. Department of Chemistry, Wilkes University, 84 West South Street, Wilkes-Barre, PA 18766
Spin lattice relaxation times (T1) were obtained for solutions of n-proply benzoate, 14.25 – 100 mol percent, with various solvents such as deuterated acetone (Ac-d6) and deuterated chloroform (CDCl3), by using the inversion recovery pulse sequence technique on a 60 MHz NMR. The T1 relaxation time represents how the Z component of magnetization (MZ) returns to its equilibrium value. Both 1H and 13C relaxation times were collected with adequate signal to noise (S/N) ratios. Proton spectra are more uniform in reproducibility with one another and were therefore more easily interpreted than the carbon spectra. Three factors that influence relaxation times were found: sample concentration, viscosity and dielectric values. As the concentration of the compound was increased the relaxation time was increased in the carbon spectra; however, T1 decreased in the proton spectra. The reasoning for this behavior is currently being explored.
 

Undergraduate Research Poster Session: Analytical Chemistry
11:00 AM-1:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Poster

Division of Chemical Education

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008