Design of neutral hydrogen ion carriers for solvent polymeric membrane electrodes of selected pH range

A Hydrogen Ion-Selective Poly(aniline) Solid Contact Electrode Based on Dibenzylpyrenemethylamine Ionophore for Highly Acidic Solutions

“…9 After Simon 10 published information about tridodecylamine ionophore for hydrogen sensing, we synthesized various types of tertiary amine compound ionophores, and strived to understand the response characteristics of these ionophores. [11][12][13][14][15] Particularly, after our result concerning SCE based on the tribenzylamine (TBA) ionophore 16 was published, which had a wider response range than the electrodes with tridodecylamine (TDDA) ionophore, many types of aromatic tertiary amine compound ionophores were synthesized and studied. [17][18][19][20][21] We found that the response ranges shifted to an alkali range (toward pH 14) by extending the chain length between the phenyl ring and nitrogen in the ionophores, and were able to synthesize ionophores that exhibited a linear response up to pH 14.…”

“…[17][18][19][20][21] We found that the response ranges shifted to an alkali range (toward pH 14) by extending the chain length between the phenyl ring and nitrogen in the ionophores, and were able to synthesize ionophores that exhibited a linear response up to pH 14. 22 As can be seen in the various results published until now on aromatic and aliphatic ionophores, however, there have been no reports on ionophores that are particularly effective in a strong acidic solution.In the present work, amine compound ionophores that could respond linearly to strong acid were synthesized, which has been noted as a limit of SPM (solvent polymeric membrane) ionophores, [13][14][15][16][17][18][19][20][21][22] and response characteristic due to structural changes of the ionophores in strong acid were demonstrated. Especially, we examined the responses resulting from increasing numbers of phenyl rings in ionophores, which had not been previously studied.…”

“…In the present work, amine compound ionophores that could respond linearly to strong acid were synthesized, which has been noted as a limit of SPM (solvent polymeric membrane) ionophores, [13][14][15][16][17][18][19][20][21][22] and response characteristic due to structural changes of the ionophores in strong acid were demonstrated. Especially, we examined the responses resulting from increasing numbers of phenyl rings in ionophores, which had not been previously studied.…”

Behavior of a Polypyrrole Solid Contact pH-Selective Electrode Based on Tertiary Amine Ionophores Containing Different Alkyl Chain Lengths between Nitrogen and aPhenyl Group

“…The former researchers reported that as the pKa value of the ionophores in a membrane increased, the response range of electrodes containing the tertiary amine ionophores widened. 10 Also in our lab, we recently reported that tribenzylamine ionophore 11 yielded a wider applicable pH range and a better selectivity coefficient than any other trialkylamine ionophore, including tridodecylamine. 12 In the present work we used a tertiary amine ionophore including a phenyl ring, like a tribenzylamine, and intended to produce an all-solid contact potentiometric sensor for hydrogen ion based on polypyrrole, which was covered with a plastic PVC membrane including these ionophores.…”

A Comparison of Neutral Mg2+-Selective Ionophores in Solvent Polymeric Membranes: Complex Stoichiometry and Lipophilicity

“…20 The membrane compositions were basically 1wt% of ionophore, 66wt% plasticizer (o-NPOE or ETH 8045), 32wt% PVC and the adequate amount of KTpClPB was added as anionic sites with adequate concentration (mol % relative to ligand). …”