Photoinduced electron transfer of [ Ru (bpy)_2 (4, 4'-dcbpy)]~(2 ) with electron donors |
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Authors: | XIE Pu-Hui ZHANG Lian-Qi HOU Yuan-JunZHANG Bao-Wen CAO YiInstitute of Photographic Chemistry Chinese Academy of Sciences Beijing China WU Fang TIAN Wen-Jing SHEN Jia-CongKey Laboratory for Supramolecular Structure and Spcctroscopy Jilin University Changchun Jilin China |
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Institution: | XIE,Pu-Hui ZHANG,Lian-Qi HOU,Yuan-JunZHANG,Bao-Wen CAO,YiInstitute of Photographic Chemistry,Chinese Academy of Sciences,Beijing 100101,China WU,Fang TIAN,Wen-Jing SHEN,Jia-CongKey Laboratory for Supramolecular Structure and Spcctroscopy,Jilin University,Changchun,Jilin 130023,China |
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Abstract: | Emission quenching of Ru(bpy)2(4,4′‐dcbpy) ] (PF6)2 (1) by benzenamine,4‐2‐5‐4‐4‐dimethylamino]phenyl]‐4,5‐dihydro‐l‐phenyl‐1H‐pyrazol‐3‐yl]‐ethenyl]‐N, N‐dimethyl (2) or 1,5‐diphenyl‐3–(2‐phenothiazine)‐2‐pyrazoline (3) was observed. Measurements of the emission decay of 1 before and after addition of 2 or 3 by single photon counting technique confirmed the observations. The emission quenching of 1 by 2 or 3 was submitted to Stern‐Volmer equation. It was calculated that the quenching rate constants (Kq) are 5.5×109 (mol/L)?1s?1 for 2 and 4.0×109 (mol/L)?1 for 3, respectively. These results indicated a character of dynamic quenching process. The singlet‐state of 2 or 3 was also quenched by 1. The quenching behaviors did not conform to the Stern‐Volmer equation and involved both static and dynamic quenching processes. The apparent quenching rate constant (kapp) was calculated to be 3×109 (mol/L)?1 for the interaction of excited 2 with 1, and 1.2×109 (mol/L)?1 for that of excited 3 with 1. |
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Keywords: | Ruthenium complexes pyrazoline compounds electrontransfer dynamic quenching |
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