Synthesis and Photophysical Properties of Neutral Luminescent Rhenium-Based Molecular Rectangles
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- 作者：T. Rajendran ; Bala. Manimaran ; Rong-Tang Liao ; Ren-Jay Lin ; P. Thanasekaran ; Gene-Hsiang Lee ; Shie-Ming Peng ; Yen-Hsiang Liu ; I-Jy Chang ; S. Rajagopal ; and Kuang-Lieh Lu
- 刊名：Inorganic Chemistry
- 出版年：2003
- 出版时间：October 6, 2003
- 年：2003
- 卷：42
- 期：20
- 页码：6388 - 6394
- 全文大小：155K
- 年卷期：v.42,no.20(October 6, 2003)
- ISSN：1520-510X
文摘
A series of neutral luminescent molecular rectangles [{Re(CO)3(
-bpy)Br}{Re(CO)3(-L)Br}]2 (1-4) having fac-Re(CO)3Br as corners and 4,4'-bipyridine (bpy) as the bridging ligand on one side and other bipyridyl ligands ofvarying length (L) on the other side have been synthesized and characterized. The crystal structure of 1 shows arectangular cavity with the dimensions of 11.44 × 7.21 Å. When the cavity size is tuned from 1 to 4, a dimensionof 11.4 × 20.8 Å could be achieved, as revealed by the molecular modeling. These rectangles exhibit luminescencein solution at room temperature. In particular, compound 4 containing 1,4-bis(4'-pyridylethynyl)benzene (bpeb) asbridging ligand shows the excited-state lifetime of 495 ns. Fine-tuning of the cavity size of the rectangles improvestheir excited-state properties. These properties facilitate the study of excited-state electron-transfer reactions withelectron acceptors and donors and host-guest binding. Crystallographic information: 1·6CH3COCH3 is monoclinic,P21/c, with a = 12.0890(2), b = 24.2982(2), and c = 12.8721(2) Å, 
= 107.923(1)
, and Z = 2.
-bpy)Br}{Re(CO)3(-L)Br}]2 (1-4) having fac-Re(CO)3Br as corners and 4,4'-bipyridine (bpy) as the bridging ligand on one side and other bipyridyl ligands ofvarying length (L) on the other side have been synthesized and characterized. The crystal structure of 1 shows arectangular cavity with the dimensions of 11.44 × 7.21 Å. When the cavity size is tuned from 1 to 4, a dimensionof 11.4 × 20.8 Å could be achieved, as revealed by the molecular modeling. These rectangles exhibit luminescencein solution at room temperature. In particular, compound 4 containing 1,4-bis(4'-pyridylethynyl)benzene (bpeb) asbridging ligand shows the excited-state lifetime of 495 ns. Fine-tuning of the cavity size of the rectangles improvestheir excited-state properties. These properties facilitate the study of excited-state electron-transfer reactions withelectron acceptors and donors and host-guest binding. Crystallographic information: 1·6CH3COCH3 is monoclinic,P21/c, with a = 12.0890(2), b = 24.2982(2), and c = 12.8721(2) Å, = 107.923(1), and Z = 2.