Kinetic Studies of Complexation of Divalent Strontium, Barium, Lead, and Mercury Cations by Aqueous 15-Crown-5 and 18-Crown-6.

Abstract

The rates of complexation-decomplexation of the 15-crown-5 (1,4,7,10,13-pentaoxacyclopentadecane) and 18-crown-6 (1,4,7,10,13,16-hexaoxacyclooctadecane) complexes of the aqueous cations Sr(2+), Ba(2+), Pb(2+), and Hg(2+) have been determined from ultrasonic absorption measurements covering the 15-205 MHz frequency range at 25 degree. As in the case of previously reported studies of complexation of monovalent cations by these crown ethers, the data have been fitted to a two-step mechanism. Diffusion has been ruled out as the rate limiting step in the complexation. Loss of coordinated water from the ions is proposed as the rate determining step. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 31, 1977
Accession Number
ADA041501

Entities

People

  • Edward M. Eyring
  • Gerard W. Liesegang
  • Licesio J. Rodriguez
  • Michael M. Farrow
  • Neil Purdie

Organizations

  • University of Utah

Tags

DTIC Thesaurus Topics

  • Absorption
  • Amplitude
  • Argon Lasers
  • Arrhenius Equation
  • Buildings And Structures
  • Chemistry
  • Contracts
  • Crown Ethers
  • Diffusion
  • Ethers
  • Frequency
  • Measurement
  • Metals
  • Military Research
  • Strontium
  • Transducers
  • Transition Metals

Fields of Study

  • Chemistry

Readers

  • Materials Science and Engineering.
  • Organic Chemistry