Non-protected fluid room temperature phosphoresence of beta-bromonaphthalene and its medium effects

A strong and stable room temperature phosphorescence (RTP) signal of beta-b romonaphthalene (beta-BrN) aqueous solution with peak wavelengths of lambda (ex)/lambda(cm) = 275.0 nm/(494. 3, 517.6) nm can be induced only by using Na2SO3 as an oxygen scavenger and irradiating the solution for some time wi th the light source of apparatus, The RTP intensity and irradiation time re quired to acquire a stable RTP signal are very sensitive to the kind and am ount of organic solvent added to the system. For a beta-BrN/Na2SO3 aqueous solution system containing 2.5% acetonitrile, a short irradiation time is n eeded and a strong and stable RTP signal is triggered quickly, The RTP inte nsity is linear to the beta-BrN concentration in the range 8.0 x 10(-8) - 1 .6 x 10(-5) mol/L with the detection limit of 4.7 x 10(-8) mol/L.