Abstract
Azo compds., including 4,4'-(4,5-diaminonaphthalen-1,8-diylazo)bisbenzenesulfonate (DBS), 4,5-bis(4-
nitrophenylazo)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 solns. DBS interacts specifically with
Fe3+ in HCl soln., 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 equil. const. is 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 2 sulfonate groups is essential for Fe3+ chelation. DBS can be modified on glassy C and Au-sputtered
deazotization processes in HCl
soln. When immobilized on QCM, DBS showed ability to attract Fe3+ from the soln. phase, leading to a linear relation
between log|∆f| and log[Fe3+] over the range 10-4-10-3 M in 0.01M HCl, with little interference from Fe2+ and Cr3+.
Accordingly, DBS is a promising receptor for Fe3+ in acidic conditions.
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