TY - JOUR

T1 - pH-dependent distribution of the indicator dye tetrabromophenolphthalein ethyl ester between aqueous solution and plasticized polymeric phase

T2 - Predicting the lifetime of ion-selective optical sensors

AU - Tiuftiakov, Nikolai Yu.

AU - Kalinichev, Andrey V.

AU - Rudenko, Ilya V.

AU - Bessonova, Elena A.

AU - Kartsova, Liudmila A.

AU - Peshkova, Maria A.

PY - 2020/7

Y1 - 2020/7

N2 - The pH-dependent distribution of the indicator dye tetrabromophenolphthalein ethyl ester (TBPE, chromoionophore VIII) between plasticized polymeric phase and aqueous solution is studied. The commonly utilized algorithms for partition properties calculation are evaluated experimentally in terms of their suitability for the ionized species. The physical-chemical characteristics of TBPE that determine its applicability for use in chemical sensors, namely, the lipophilicity and acidity constant are estimated in the hydrophobic polymeric phase for the first time. The distribution coefficients of the neutral (protonated) and ionized (deprotonated) forms of TBPE are determined in plasticized PVC/water biphase system as 7.2 and 3.8, respectively (logk, ionic strength 1 M, 25 °C). The acidity constant of TBPE in plasticized PVC membrane, pKaPVC−DOS, is estimated spectrophotometrically as 6.1 ± 0.2 log units. The results can be used for developing optical chemical sensors based on TBPE (chromoionophore VIII), in particular for predicting the sensor lifetime, optimization of the sensor operating range and measuring conditions.

AB - The pH-dependent distribution of the indicator dye tetrabromophenolphthalein ethyl ester (TBPE, chromoionophore VIII) between plasticized polymeric phase and aqueous solution is studied. The commonly utilized algorithms for partition properties calculation are evaluated experimentally in terms of their suitability for the ionized species. The physical-chemical characteristics of TBPE that determine its applicability for use in chemical sensors, namely, the lipophilicity and acidity constant are estimated in the hydrophobic polymeric phase for the first time. The distribution coefficients of the neutral (protonated) and ionized (deprotonated) forms of TBPE are determined in plasticized PVC/water biphase system as 7.2 and 3.8, respectively (logk, ionic strength 1 M, 25 °C). The acidity constant of TBPE in plasticized PVC membrane, pKaPVC−DOS, is estimated spectrophotometrically as 6.1 ± 0.2 log units. The results can be used for developing optical chemical sensors based on TBPE (chromoionophore VIII), in particular for predicting the sensor lifetime, optimization of the sensor operating range and measuring conditions.

KW - Acidity constant

KW - Indicator dye

KW - Lipophilicity

KW - Liquid-liquid interface

KW - Partition coefficient

KW - Phase distribution equilibria

KW - Polymeric optodes

KW - OPTODE

KW - CHROMOIONOPHORES

KW - SPECTROPHOTOMETRIC DETERMINATION

KW - TENSION

KW - EXTRACTION

KW - BLOOD

UR - http://www.scopus.com/inward/record.url?scp=85087973487&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/f1093e8e-0331-345f-8d88-327a47fb8932/

U2 - 10.1016/j.colcom.2020.100295

DO - 10.1016/j.colcom.2020.100295

M3 - Article

AN - SCOPUS:85087973487

VL - 37

JO - Colloids and Interface Science Communications

JF - Colloids and Interface Science Communications

SN - 2215-0382

M1 - 100295

ER -