30 May 2013 DSC and Raman spectra of α and β-Endosulfan plus 60/40 mixture
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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.
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Walter F. Schmidt, Walter F. Schmidt, Julie K. Nguyen, Julie K. Nguyen, Jianwei Qin, Jianwei Qin, Moon S. Kim, Moon S. Kim, Swati Mookherji, Swati Mookherji, Laura L. McConnell, Laura L. McConnell, Cathleen J. Hapeman, Cathleen J. Hapeman, Kuanglin Chao, Kuanglin Chao, "DSC and Raman spectra of α and β-Endosulfan plus 60/40 mixture", Proc. SPIE 8721, Sensing for Agriculture and Food Quality and Safety V, 87210R (30 May 2013); doi: 10.1117/12.2018615; https://doi.org/10.1117/12.2018615

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