TY - JOUR
T1 - Triphosphate Ion-Selective Electrode Based on Zr-Porphyrin Complex
AU - Yagi, Yuma
AU - Masaki, Shuhei
AU - Iwata, Tetsuki
AU - Nakane, Daisuke
AU - Yasui, Takashi
AU - Yuchi, Akio
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/4/4
Y1 - 2017/4/4
N2 - Ion-selective electrode using zirconium(IV) complex with octaethylporphin (H2oep) as a carrier showed high selectivity to triphosphate (TP, H5tp) against other hydrophilic anions including diphosphate and phosphate. The electroactive species was identified to be [(Zr4(oep)4(Htp)2] (TP/Zr ratio of 0.5) of the unique structure; triphosphates are recognized by one Zr atom through three O atoms on three different P atoms and by another Zr atom through two O atoms on two terminal P atoms and are also involved in complementary intermolecular hydrogen bonding to be surrounded by four porphyrin complexes. In contrast, Zr(IV) in the other complex with tetraphenylporphin has the higher Lewis acidity, due to the electron-withdrawing property of phenyl rings and, at the higher TP concentration, forms a species having a TP/Zr ratio of unity, which precipitates to lose the electroactivity. The electrode was successfully applied to monitor hydrolysis of TP that provides diphosphate and phosphate.
AB - Ion-selective electrode using zirconium(IV) complex with octaethylporphin (H2oep) as a carrier showed high selectivity to triphosphate (TP, H5tp) against other hydrophilic anions including diphosphate and phosphate. The electroactive species was identified to be [(Zr4(oep)4(Htp)2] (TP/Zr ratio of 0.5) of the unique structure; triphosphates are recognized by one Zr atom through three O atoms on three different P atoms and by another Zr atom through two O atoms on two terminal P atoms and are also involved in complementary intermolecular hydrogen bonding to be surrounded by four porphyrin complexes. In contrast, Zr(IV) in the other complex with tetraphenylporphin has the higher Lewis acidity, due to the electron-withdrawing property of phenyl rings and, at the higher TP concentration, forms a species having a TP/Zr ratio of unity, which precipitates to lose the electroactivity. The electrode was successfully applied to monitor hydrolysis of TP that provides diphosphate and phosphate.
UR - https://www.scopus.com/pages/publications/85019688971
U2 - 10.1021/acs.analchem.6b03754
DO - 10.1021/acs.analchem.6b03754
M3 - Article
C2 - 28266211
AN - SCOPUS:85019688971
SN - 0003-2700
VL - 89
SP - 3937
EP - 3942
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 7
ER -