Ruthenium(II) tris-(2,2ʹ-bipyridine) -specific extrinsic lyoluminescences of x-ray irradiation colored and electrolytically colored alkali halides

Short-lived solid/solution interfaces, which are sufficiently energetic to initiate the radiative 3MLCT-based transition of rutheniumdl) tris-(2,2ʹ-bipyridine) chelate, can be produced by dissolving x-ray irradiation colored or electrolytically colored alkali halides in water. This study discusses in detail the mechanisms of these ruthenium(II) tris-(2,2ʹ-bipyridine)-specific extrinsic lyoluminescences of x-ray irradiated sodium chloride and electrolytically colored potassium chloride and, in addition, points out its analytical feasibility; air-equilibrated sample solutions can be used because of a weak quenching effect of dissolved oxygen on the Ru(bpy)2+3-specific lyoluminescences, calibration curves with linear ranges of 5 orders of magnitude and with the detection limits of approximately 1 × 10−10 M have been obtained for the Ru(bpy)2+3 determinations by using the aforementioned lyoluminescence excitation sources. In particular, the electrolytically colored potassium chloride in the presence of peroxydisulfate provides the excitation source for the ultimate trace analysis of ruthenium(II) tris-(2,2ʹ-bipyridine) in aqueous solutions, mainly because of its good long term stability, and low inherent intrinsic lyoluminescence which results in a good signal-to-noise ratio for this lyoluminescent detection.