Ultrasonic Absorption Kinetic Studies of the Complexation of Aqueous Potassium and Cesium Ions by 18-crown-6.

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Abstract:

Reaction rate constants for a rapid conformational rearrangement of aqueous 18-crown-6 1,4,7,10,13,16-hexaoxacyclooctadecane and its slower complexation of potassium ions at 25C in aqueous solutions have been determined from ultrasonic absorption data covering the 9-340 MHz frequency range. A concentration independent absorption with a maximum at about 100 MHz occurs in aqueous solutions of 18-crown-6 with no alkali metal cations present. This relaxation was attributed to a conformational rearrangement of the crown ether. Complexation of aqueous potassium ion by the polyether was then investigated kinetically at various polyether and potassium ion concentrations. These data, together with the conformational rearrangement data, were analyzed in terms of two step mechanism.

Author(s):
Liesegang, Gerard W. ; Farrow, Michael M. ; Purdie, Neil ; Eyring, Edward M.
Author Organization(s):
UTAH UNIV SALT LAKE CITY DEPT OF CHEMISTRY
Descriptive Note:
Technical rept.,
Pagination:
0030

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-5
Contract/Grant Number(s):
N00014-75-C-0796
Project Number(s):
NR-051-556
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*COMPLEX COMPOUNDS, REACTION KINETICS, SOLUTIONS(MIXTURES), CESIUM, MOLECULAR STRUCTURE, POTASSIUM, ULTRASONIC PROPERTIES
Field(s)/Group(s):
Atomic and Molecular Physics and Spectroscopy
Keyword(s):
Molecular conformations, Ultrasonic spectroscopy
Report Date:
1975 Sep 10