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Refractometric studies of molecular complexes ofDDT with some compounds of biological interest

Refraktometrische Untersuchungen an Molekülkomplexen von DDT mit einigen biologisch relevanten Verbindungen

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Formation of molecular complexes betweenDDT as acceptor and indole, 2-methylindole, 3-methylindole, benzene and naphthalene as donors have been studied in carbon tetrachloride using refractometric and differential refractometric measurements. Titration techniques through these measurements have indicated11 stoichiometry of these complexes. Equilibrium constants (K 1) and extent of electronic polarization were calculated. Two types of complexes were observed, one association involving primarily the benzhydryltrichloromethyl grouping ofDDT with a polar complexing agents, and the other interaction of theDDT aromatic π-electron system with π-electrons of donors in the complexing molecule. These data support the charge-transfer complex formation hypothesis for the mode of action ofDDT on molecular level.


Es wurde die Bildung von Molekülkomplexen zwischenDDT als Acceptor und Indol, 2-Methyl-indol, 3-Methyl-indol, Benzol und Naphthalin als Donor in CCl4 mittels Refraktometrie und differenzieller Refraktometrie untersucht. Es wurde11-Stöchiometrie der Komplexe festgestellt, Gleichgewichtskonstanten und das Ausmaß der Elektronenpolarisation wurden berechnet. Zwei Typen von Komplexen wurden beobachtet; in einem Fall erfolgt die Assoziation primär über die Benzhydryltrichlormethyl-Gruppierung desDDT, im anderen Fall über π-Elektronenwechselwirkungen. Die Daten unterstützen ein chargetransfer-Modell der Komplexbildung vonDDT mit geeigneten Donormolekülen.

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Sahai, R., Chauhan, M. & Singh, V. Refractometric studies of molecular complexes ofDDT with some compounds of biological interest. Monatshefte für Chemie 112, 935–943 (1981). https://doi.org/10.1007/BF00905065

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  • Charge-transfer complexes
  • DDT
  • Electronic polarization
  • Equilibrium constants
  • Indoles
  • Refractometry