Abstract
The number and nature of coordinating entities as well as the size of chelating cavity in rhodamine based chemosensors were tuned to enhance the selectivity and sensitivity for Fe 3+ ions. An intense pink color development and enhancement in fluorescence emission intensity of chemosensor 5 upon complex formation at pH 7·4 enabled the detection of Fe 3+ ions in the presence of other competitive metal ions like Li + , Na + , K + , Cs + , Mg 2+ , Ca 2+ , Sr 2+ , Cr 3+ , Mn 2+ , Fe 2+ , Cu 2+ , Co 2+ , Ni 2+ , Zn 2+ , Cd 2+ , Hg 2+ , and Pb 2+ . A plausible application of chemosensor 5 in the imaging of live fibroblast cells exposed to Fe 3+ ions is also demonstrated. ► Number and orientation of chelating atoms for detection of Fe 3+ ions is explored. ► Probe 5 selectively detects Fe 3+ even in the presence of competitive metal ions. ► Mechanistic aspects of Fe 3+ selective sensing have been demonstrated. ► Distorted octahedral geometry of 5 -Fe 3+ complex is proposed. ► Imaging of live fibroblast cells exposed to Fe 3+ ions is presented.
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