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Proceedings Paper

DSC and Raman spectra of α and β-Endosulfan plus 60/40 mixture
Author(s): Walter F. Schmidt; Julie K. Nguyen; Jianwei Qin; Moon S. Kim; Swati Mookherji; Laura L. McConnell; Cathleen J. Hapeman; Kuanglin Chao
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Paper Abstract

The symmetrical β−conformer of endosulfan has the identical chemical composition of the asymmetrical α−conformer, and both have very different melting/boiling points. The α− and β−isomer however have markedly different Raman spectra at each of 50°C, 75°C and 100°C. Moreover, the commercially available Raman spectra of the 60/40 (α−/β−) mixture at the same temperatures is discrete from either a- and b-isomer alone. Previous research demonstrated that at a- boiling point 110°C, β−conformer partially converts to α−. DSC curves of mixtures suggest thermal interactions and conformational changes occurs in BOTH α− and β−isomer at temperatures even 60°C lower than the liquid/gas phase transition.

Paper Details

Date Published: 30 May 2013
PDF: 7 pages
Proc. SPIE 8721, Sensing for Agriculture and Food Quality and Safety V, 87210R (30 May 2013); doi: 10.1117/12.2018615
Show Author Affiliations
Walter F. Schmidt, Agricultural Research Service (United States)
Julie K. Nguyen, Agricultural Research Service (United States)
Jianwei Qin, Agricultural Research Service (United States)
Moon S. Kim, Agricultural Research Service (United States)
Swati Mookherji, Agricultural Research Service (United States)
Laura L. McConnell, Agricultural Research Service (United States)
Cathleen J. Hapeman, Agricultural Research Service (United States)
Kuanglin Chao, Agricultural Research Service (United States)


Published in SPIE Proceedings Vol. 8721:
Sensing for Agriculture and Food Quality and Safety V
Moon S. Kim; Shu-I Tu; Kuanglin Chao, Editor(s)

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