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Discovery and Characterization of Tetraalkylammonium Polybromides with Raman Spectroscopy
In this webinar we will discuss how Raman spectroscopy was employed to discover and characterize a series of previously unknown polybromides, and how Raman results were combined with ab initio calculation to shed light on their molecular structures.
A large number of polyhalides, especially polyiodides, have been discovered and studied, but definitive studies on polybromides remain scarce. Tribromide is the only monovalent polybromide with a known structure. Higher-order monovalent polybromide anions have been proposed but not structurally confirmed as discrete species. In this study tetraalkylammonium polybromides with molecular formulas R4NBr2x+1 (R = ethyl; x = 1, 2, 3, 4) were prepared by reacting tetraalkylammonium monobromide or tribromide salts with gas-phase bromine. Distinct and characteristic Raman spectra were obtained from the solid polybromides in the spectral range between 100 and 400 cm-1. Experimental Raman spectra were compared to ab initio calculations to deduce the structure of these polybromide anions. General agreement between experimental and theoretical results was observed.
This study demonstrates that Raman spectroscopy is a sensitive technique to probe the structure of discrete monovalent polybromides.
AIR DATE: July 15, 2010
Name: Dr. Shawn Chen
Title: Senior Chemist
Company: Dow Chemical