Luminescent rhenium(I) carbon wires: Synthesis, photophysics, and electrochemistry. X-ray crystal structure of [Re(tBu2bpy)(CO)3(C≡CC≡C)Re( tBu2bpy)(CO)3]

Organometallics

Volumn 15, Issue 6, 1996, Pages 1740-1744

  Yam, Vivian Wing Wah ^a   Lau, Victor Chor Yue ^a   Cheung, Kung Kai ^a  

^a UNIVERSITY OF HONG KONG   (Hong Kong)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000641443     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om950852l     Document Type: Article

References (37)

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34. A reviewer raised the point about the possibility of the presence of a luminescent impurity in 2. We have also been aware of this possibility. However, although we cannot completely exclude this possibility, we do not favor this assignment on the basis of the following grounds. First, an assignment of the 750 nm band to an impurity emission is unlikely, since it is difficult to envisage a possible impurity, whether organic or inorganic in nature, to emit at such low energies. Excitation of other rhenium(I) acetylides such as 1 and 3 at λ= 450-480 nm do not give emission at similar energies. Second, the possibility of the 630-nm emission as due to an impurity has also been disfavored. The most probable impurity that would emit at this energy would be a trace amount of 1 in 2. However, we found that there is a small discrepancy between the emission wavelengths of 1 and 2 in the same solvent system. For example, 1 emits at 670 nm, while 2 emits at 630 nm in THF. Third, the excitation spectra of 2 monitored at the two different emission bands are also very similar in the high-energy regime. Fourth, the room-temperature solid-state emission spectra of 1 and 2 occur at 610 and 690 nm, respectively. If 1 is really present as an impurity in 2, it should also show up in the solid-state spectra, since 1 also has a much larger luminescence quantum efficiency than does 2 in the solid state.
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