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DDT Polymorphism and the Lethality of Crystal Forms

Journal Article · · Angewandte Chemie
 [1];  [2];  [2];  [3];  [2];  [4]
  1. 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
  2. Department of Chemistry and Molecular Design Institute New York University 100 Washington Square East, Room 1001 New York City NY 10009 USA
  3. Department of Physics and Astronomy, High Pressure Science and Engineering Center University of Nevada Las Vegas NV 89154 USA
  4. 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

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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; NA0001982
OSTI ID:
1374466
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 34 Vol. 129; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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