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Abstract
To measure room temperature phosphorescence (RTP) in fluid medium, the conditions: (a) heavy atom perturbation for enhancing the intersystem crossing rate; (b) organization medium for protecting the triplet state from the quenching of oxygen; and (c) complete removal of dissolved oxygen, have been thought to be essential. However, recent developments showed that it was not indispensable to have the three conditions at the same time. In fact, RTP could be obtained under two conditions, namely: (a) complete removal of dissolved oxygen from the solution in the presence of heavy atom perturbers without any organization medium, resulting in non‐protected fluid RTP and (b) rigid microenvironment which is able to confine the motion of phosphors and avoid effective contact between dissolved oxygen and phosphors within the collision distance, resulting in the anti‐oxygen‐quenching or non‐deoxygenated RTP. This work investigated the effect of generally used organic solvents, cyclohexane, dichloromethane, 1,2‐dichloroethane, chloroform, tetrahydrofuran (with an except for BNS) etc, on RTP of 1‐bromonaphthalene (1‐BrN), 1‐bromo‐2‐methylnaphthalene (1‐Br‐2‐MN), 1‐bromo‐4‐methylnaphthalene (1‐Br‐4‐MN) and 6‐bromo‐2‐naphthylsulfate potassium (BNS) in β‐cyclodextrin (β‐CD) aqueous solution in the presence of dissolved oxygen. The experiments showed that the presence of micro amount solvents was essential to get strong non‐deoxygenated RTP. Moreover, good linear relationships and relatively lower detection limits for analysis goal were obtained in the range detected based on the non‐deoxygenated cyclodextrin (CD) induced room temperature phosphorimetry (CD‐RTP).
Acknowledgments
The authors acknowledge the National Nature Science Foundation of China and the Youth Foundation of Shanxi Province (China) for financial support of this work.