Alkali metal, alkaline earth metal, and ammonium ion selectivities of dibenzo-16-crown-5 compounds with functional side arms in ion-selective electrodes

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Analytical Chemistry (Washington); (United States)

DOI:https://doi.org/10.1021/ac00095a033· OSTI ID:6737061

Ohki, Akira; Lu, J P; Huang, X; Bartsch, R A ^[1]

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1. Texas Tech Univ., Lubbock, TX (United States)

Potentiometric selectivities of 11 dibenzo-16-crown-5 compounds for alkali metal, alkaline earth metal, and ammonium ions have been determined in solvent polymeric membrane electrodes. The ionophores bear one or two pendent groups on the central carbon of the three-carbon bridge in the polyether ring. Side-arm variation includes OCH[sub 3], OCH[sub 2]CH[sub 2]OCH[sub 3], OCH[sub 2]CO[sub 2]C[sub 2]H[sub 5], OCH[sub 2]C(O)N(C[sub 2]H[sub 5])[sub 2], and OCH[sub 2]C(O)N(C[sub 5]H[sub 11])[sub 2] units. Attachment of a propyl group to the ring carbon that bears an extended, oxygen-containing side arm increases the selectivity for Na[sup +] relative to larger alkali metal and alkaline earth metal cations. For a given side arm, a linear relationship is obtained when the enhancement in Na[sup +] selectivity produced by attachment of a geminal propyl group is plotted against the diameter of the interference ion. Potentiometric responses of the dibenzo-16-crown-5 compounds are rationalized in terms of the crown ether ring size and the oxygen basicity, conformational positioning, and rigidity of the side arm. 22 refs., 3 figs., 2 tabs.

• DOE Contract Number: FG03-94ER14416
• OSTI ID: 6737061
• Journal Information: Analytical Chemistry (Washington); (United States), Journal Name: Analytical Chemistry (Washington); (United States) Vol. 66:23; ISSN 0003-2700; ISSN ANCHAM
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400105* -- Separation Procedures
400201 -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AMMONIUM COMPOUNDS
AROMATICS
CHARGED PARTICLES
CHLORINATED ALIPHATIC HYDROCARBONS
COMPILED DATA
CROWN ETHERS
DATA
ELECTRODES
ETHERS
EXTRACTION
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
ION-SELECTIVE ELECTRODES
IONS
MAGNETIC RESONANCE
MEMBRANES
MOLECULAR STRUCTURE
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYVINYLS
POTENTIOMETRY
PVC
RESONANCE
SEPARATION PROCESSES
TITRATION