11 Ion Analysis




  • Product code
    B020  Bis(benzo-15-crown-5)
  • CAS No.
  • Chemical name
  • MW
Unit size Price Item Code
100 m $176.00 B020-10
100 m
Quantity may be adjusted within the cart.


Product Description
Bis(benzo-15-crown-5) is a potassium selective ionophore. Its potassium ion selectivity is almost equal to that of valinomycin, which is a well known neutral carrier for the potassium ion in nature. This reagent, combined with NPOE as a plasticizer, is the most recommended ionophore for potassium-selective PVC membrane electrodes. This ionophore also forms a thallium complex, so it can be used for thallium sensors.

Chemical Structure

Ion selectivity: LogKt(K/Na):-3.6, LogKpot(K/Rb):-0.7, LogKpot(K/NH4):-2.0, LogKpot(K/Cs):-2.0
Formulation: Ionophore: 2.7%, NPOE: 70%, TFPB: 50 mol% of ionophore/PVC, THF


Open References

1. H. Tamura, K. Kimura and T. Shono, "Thallium(I)-selective PVC Membrane Electrodes Based on Bis(crown ether)s", J. Electroanal. Chem., 1980, 115, 115.
2. H. Tsukube, K. Takagi, T. Higashiyama, T. Iwachido and N. Hayama, "Biomimetic Application of Natural Valinomycin and Nonactine Ionophores to Artificial Transport of Amino Acid Salts", Bull. Chem. Soc. Jpn., 1986, 59, 2021.
3. Y. Yamashoji, M. Tanaka, S. Nagamune, M. Ouchi, T. Hakushi and T. Shono, "Polymer Membrane Thallium(I)-selective Electrodes Based on Dibenzo-crown-6 Ethers", Anal. Sci., 1991, 7, 485.

Handling and storage condition

Appearance: White powder
Purity (HPLC): ≧ 98.0 %
Solubility in Tetrahydrofuran: To pass test (clear, colorless or almost colorless)
IR spectrum: Authentic
NMR spectrum: Authentic
Handling and storage condition
Ambient temperature

Product Classification

Product Classification

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