TY - JOUR
T1 - Proton-assisted iron(III) recognition with 4,4′-(4,5-diaminonaphthalen-1,8-yldiazo)-bisbenzenesulfonate
AU - Cheng, Yu Jiuan
AU - Liao, Wei Ching
AU - Wang, Chong Mou
N1 - Funding Information:
The authors thank the National Science Council, Republic of China, for financial support (NSC 94-2113-M-003-018 and 94-2815-C-003-004-M).
PY - 2008/1/1
Y1 - 2008/1/1
N2 - Azo compounds, including 4,4′-(4,5-diaminonaphthalen-1,8-yldiazo)-bisbenzenesulfonate (DBS), 4,5-bis-(4-nitro-phenylazo)-naphthlene-1,8-diamine (NND), 4-(4-aminophen-1-ylazo)-benzenesulfonic acid (ABS), 4-(4-aminonaphthalen-1-ylazo)-benzenesulfonic acid (ANBS) and 1,1′-(4,5-diaminonaphthalen-1,8-diylazo)-bisbenzene (DNB) were synthesized and characterized for their potential in Fe3+ recognition in acidic solutions. DBS interacts specifically with Fe3+ in HCl solution, resulting in a significant alteration of the absorption and emission spectra. According to the spectral changes, DBS probably forms a 1:1 complex with Fe3+; the equilibrium constant was estimated to be ∼105 M-1. Replacing Fe3+ with Fe2+, Ni2+, Al3+ and Cr3+ or substituting NND, ABS, ANBS and DNB for DBS did not yield similar results, indicating that a configuration of two sulfonate groups is essential for Fe3+ chelation. DBS can be modified on glassy carbon and Au-sputtered quartz crystal electrodes (Au-QCM, fo = 9 MHz), via azotization and in situ electrochemical deazotization processes in HCl solution. When immobilized on QCM, DBS showed ability to attract Fe3+ from the solution phase, leading to a linear relationship between log{divides}Δf{divides} and log[Fe3+] over the range 10-4-10-3 M in 0.01 M HCl, with little interference from Fe2+ and Cr3+. Accordingly, DBS is a promising receptor for Fe3+ in acidic conditions.
AB - Azo compounds, including 4,4′-(4,5-diaminonaphthalen-1,8-yldiazo)-bisbenzenesulfonate (DBS), 4,5-bis-(4-nitro-phenylazo)-naphthlene-1,8-diamine (NND), 4-(4-aminophen-1-ylazo)-benzenesulfonic acid (ABS), 4-(4-aminonaphthalen-1-ylazo)-benzenesulfonic acid (ANBS) and 1,1′-(4,5-diaminonaphthalen-1,8-diylazo)-bisbenzene (DNB) were synthesized and characterized for their potential in Fe3+ recognition in acidic solutions. DBS interacts specifically with Fe3+ in HCl solution, resulting in a significant alteration of the absorption and emission spectra. According to the spectral changes, DBS probably forms a 1:1 complex with Fe3+; the equilibrium constant was estimated to be ∼105 M-1. Replacing Fe3+ with Fe2+, Ni2+, Al3+ and Cr3+ or substituting NND, ABS, ANBS and DNB for DBS did not yield similar results, indicating that a configuration of two sulfonate groups is essential for Fe3+ chelation. DBS can be modified on glassy carbon and Au-sputtered quartz crystal electrodes (Au-QCM, fo = 9 MHz), via azotization and in situ electrochemical deazotization processes in HCl solution. When immobilized on QCM, DBS showed ability to attract Fe3+ from the solution phase, leading to a linear relationship between log{divides}Δf{divides} and log[Fe3+] over the range 10-4-10-3 M in 0.01 M HCl, with little interference from Fe2+ and Cr3+. Accordingly, DBS is a promising receptor for Fe3+ in acidic conditions.
KW - Azo dye
KW - Electrochemical quartz crystal microbalance
KW - Fe
KW - Ion recognition
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U2 - 10.1016/j.jelechem.2007.09.007
DO - 10.1016/j.jelechem.2007.09.007
M3 - Article
AN - SCOPUS:36849071852
SN - 1572-6657
VL - 612
SP - 15
EP - 21
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 1
ER -