Volume 129, Issue 34 pp. 10299-10303
Zuschrift

DDT Polymorphism and the Lethality of Crystal Forms

Jingxiang Yang

Jingxiang Yang

Department of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, Room 1001, New York City, NY, 10009 USA

School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 P.R. China

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Dr. C. T. Hu

Dr. C. T. Hu

Department of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, Room 1001, New York City, NY, 10009 USA

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Xiaolong Zhu

Xiaolong Zhu

Department of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, Room 1001, New York City, NY, 10009 USA

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Prof. Dr. Qiang Zhu

Prof. Dr. Qiang Zhu

Department of Physics and Astronomy, High Pressure Science and Engineering Center, University of Nevada, Las Vegas, NV, 89154 USA

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Prof. Dr. Michael D. Ward

Corresponding Author

Prof. Dr. Michael D. Ward

Department of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, Room 1001, New York City, NY, 10009 USA

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Prof. Dr. Bart Kahr

Corresponding Author

Prof. Dr. Bart Kahr

Department of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, Room 1001, New York City, NY, 10009 USA

Department of Advanced Science and Engineering (TWins), Waseda University, 162-0056 Tokyo, Japan

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First published: 13 June 2017
Citations: 27

Abstract

DDT (1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane), a contact insecticide with a rich and controversial history since its activity was discovered in 1939, has long been thought to be monomorphic. Herein we report the discovery and characterization of a second polymorph, designated Form II, which can be isolated as single crystals, but converts very slowly at room temperature to the form reported previously, now designated as Form I. Computations based on an evolutionary algorithm for crystal structure prediction revealed that Forms I and II are among the four lowest energy crystal structures of fifty calculated. A preliminary study of the contact insecticidal activity toward fruit flies (Drosophila melanogaster) indicates that Form II is more active, suggesting opportunities for more effective solid-state formulations that would allow reduced amounts of DDT, thereby minimizing environmental impact.

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