Luminescence lifetime-based sensor for cyanide and related anions.
A new Ru(II) complex is described which serves as a luminescence lifetime-based sensor for fluoride and cyanide anions (KF = 640 000 mol-1, KCN = 430 000 mol-1). This chromophore displays observable changes in its UV-vis and steady-state luminescence spectra upon cyanide binding. Prior to cyanide addition, this complex exhibits a single-exponential lifetime (tau = 377 +/- 20 ns). With increasing cyanide concentrations, the intensity decays are composed of two exponentials: long tau (320-370 ns) and short tau (13-17 ns). The average lifetimes shorten as a function of cyanide concentration since the fractional intensity shifts from an initial dominant long lifetime component to the short lifetime component. This work represents the first example of a direct method for the luminescence lifetime-based sensing of anions.
Anzenbacher
Pavel
P
Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA. pavel@bgnet.bgsu.edu
Tyson
Daniel S
DS
Jursíková
Karolina
K
Castellano
Felix N
FN
D000838:Anions / Q000032:analysis* / Q000737:chemistry; D003486:Cyanides / Q000032:analysis* / Q000737:chemistry; D007700:Kinetics; D008163:Luminescent Measurements; D009942:Organometallic Compounds / Q000737:chemistry; D011810:Quinoxalines / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
D000838:Anions; D003486:Cyanides; D009942:Organometallic Compounds; D011810:Quinoxalines; D012428:Ruthenium