A highly selective rhodamine based turn-on optical sensor for Fe3+

Aydin Z. , WEI Y., GUO M.

INORGANIC CHEMISTRY COMMUNICATIONS, vol.20, pp.93-96, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 20
  • Publication Date: 2012
  • Doi Number: 10.1016/j.inoche.2012.02.025
  • Page Numbers: pp.93-96


A reversible turn-on sensor (Rh-OH-Rh) which can selectively detect Fe3+ in solution has been developed. The sensor combines two rhodamine moieties with a 3-oxygen Fe3+ receptor to provide excellent selectivity for Fe3+ over a range of biologically relevant metal ions. It binds Fe3+ in a 1:1 stoichiometry with an apparent binding constant 5.2 x 10(6) M-1 (log K = 5.28) in ACN/DMF (9/1 v/v) solution. The sensor displays distinct "on-off" changes in color and fluorescence upon the alteration of free Fe3+ levels in solution with a reversible response and little interference with other biological relevant metal ions. (C) 2012 Elsevier B.V. All rights reserved.