Journal of Fluorescence

, Volume 19, Issue 4, pp 649–654 | Cite as

Incorporation of Siderophore Binding Sites in a Dipodal Fluorescent Sensor for Fe(III)

Original Paper


A new fluorescent probe 3, has been developed for the detection of Fe(III) in water based samples. The design of 3 involved the incorporation of Fe(III) binding sites observed in naturally occurring Siderophores into a synthetic sensing assembly. The probe, containing two Schiff base receptors connected to a mesitylene platform, was prepared in two steps. The dipodal sensor displayed good selectivity for Fe(III) when tested against other physiological and environmentally important metal ions, in HEPES buffered solution at pH 7.0, through a quenching of the fluorescent intensity. Stern-Volmer analysis of this quenching interaction indicated a 1:1 (host : guest) binding stoichiometry between the probe and Fe(III). The association constant, Ka calculated using the Benesi-Hildebrand equation was found to be 3.8 × 104 M−1. Crucially, the sensor was capable of measuring Fe(III) competitively in solutions containing both Fe(III) and Cu(II). Thus, the adoption of Fe(III) binding sites found in nature, into synthetic luminescent assemblies has proven an effective design strategy for the development of new Fe(III) probes.


Fluorescence Sensor Fe(III) Diopodal Schiff base 

Supplementary material

10895_2008_457_MOESM1_ESM.pdf (361 kb)
Supplementary data(PDF 369 kb)


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.School of Pharmacy and Life SciencesThe Robert Gordon UniversityAberdeenUK

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