Evaluation of a Direct 1H NMR Method for Determining Log K and Delta H Values for Crown Ether-Alkylammonium Cation Complexation

Abstract

A direct NMR method for determining log K values for crown ether ammonium cation complexation using milligrams of sample was tested and evaluated for accuracy and precision by comparing the results with those obtained using a titration calorimetric method. Log K values for the interactions of a non-chiral crown ether, diketopyridino-18-crown-6 (K2P18C6), with alpha-phenylethylammonium perchlorate in 50%-50% and 90%-10% mixtures of deuterated methanol and deuterated chloroform at four temperatures and, with alpha-naphthyl ethylammonium perchlorate in 50%CD3OD-50%CDCl3 (v/v) at 25 C were determined by a direct NMR method. (JS)

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Document Details

Document Type
Technical Report
Publication Date
Oct 24, 1990
Accession Number
ADA228585

Entities

People

  • C. Y. Zhu
  • J. L. Oscarson
  • J. S. Bradshaw
  • Reed Izatt

Organizations

  • Brigham Young University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Accuracy
  • Agreements
  • Chemical Reactions
  • Chemical Shifts
  • Chemical Synthesis
  • Chemistry
  • Chloroform
  • Crown Ethers
  • Deuterium
  • Enantiomers
  • Equations
  • Hydrogen
  • Military Research
  • Perchlorates
  • Precision
  • Standards
  • Test And Evaluation

Fields of Study

  • Chemistry

Readers

  • Approximation Theory.
  • Organic Chemistry