Photo-induced electron transfer study of rhenium(I)
bipyridyl complexes with covalently linked phenothiazine donor through
different bridge

doi:10.1007/s11458-010-0111-y

Front. Chem. China

2010, Vol. 5

Issue (2) : 171-177 https://doi.org/10.1007/s11458-010-0111-y

Research articles

Photo-induced electron transfer study of rhenium(I) bipyridyl complexes with covalently linked phenothiazine donor through different bridge

Shiguo SUN¹,Lei SHI¹,Jiangli FAN¹,Xiaojun PENG¹,Fengyu LIU²,

1.State Key Laboratory of Fine Chemicals, Dalian University of Techno- logy, Dalian 116012, China; 2.State Key Laboratory of Fine Chemicals, Dalian University of Techno- logy, Dalian 116012, China；Department of Chemistry, Dalian University of Technology, Dalian 116024, China；State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China;

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Abstract A novel rhenium(I) bipyridyl complex 1a, [(4,4’-di-COOEt-bpy)Re(CO)₃(py-NHCO-PTZ)PF₆] and a model 1b, [(4,4’-di-COOEt-bpy)Re(CO)₃(py-PTZ)PF₆] (bpy is 2, 2’-bipyridine, py-NHCO-PTZ is phenothiazine-(10-carbonyl amide) pyridine and py-PTZ is 10-(4-picolyl) phenothiazine) were synthesized. Their photo-induced electron transfer (ET) reaction with electron acceptor methyl viologen (MV²⁺) in acetonitrile was studied by nanosecond laser flash photolysis at room temperature. Photoexcitation of 1 in the presence of MV²⁺ led to ET from the Re moiety to MV²⁺ generating Re(II) and methyl viologen radical (MV^•+). Then Re(II) was reduced either by the charge recombination with MV^•+ or by intramolecular ET from the attached PTZ, regenerating the photosensitizer Re(I) and forming the PTZ radical at 510 nm. In the case of 1b, the absorption for PTZ radical can be observed distinctly accompanied intermolecular ET, whereas not much difference at 510 nm can be detected for 1a on the time scale of the experiments. This demonstrates that the linking bridge plays a key role on the intramolecular ET in complex 1.

Keywords rhenium(I) bipyridyl complex intermolecular electron transfer intramolecular electron transfer phenothiazine acceptor

Issue Date: 05 June 2010

Cite this article:

Shiguo SUN,Jiangli FAN,Fengyu LIU, et al. Photo-induced electron transfer study of rhenium(I) bipyridyl complexes with covalently linked phenothiazine donor through different bridge[J]. Front. Chem. China, 2010, 5(2): 171-177.

URL:

https://academic.hep.com.cn/fcc/EN/10.1007/s11458-010-0111-y
https://academic.hep.com.cn/fcc/EN/Y2010/V5/I2/171

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