Self-Assembled Arene-Ruthenium-Based Rectangles for the Selective Sensing of Multi-Carboxylate Anions
Vajpayee, V; Song, YHo; Lee, MinH; Kim, H; Wang, M; Stang, PJ; Chi, KiW
| HERO ID | 4932992 |
|---|---|
| In Press | No |
| Year | 2011 |
| Title | Self-Assembled Arene-Ruthenium-Based Rectangles for the Selective Sensing of Multi-Carboxylate Anions |
| Authors | Vajpayee, V; Song, YHo; Lee, MinH; Kim, H; Wang, M; Stang, PJ; Chi, KiW |
| Journal | Chemistry: A European Journal |
| Volume | 17 |
| Issue | 28 (Jul 4 |
| Page Numbers | 7837 |
| Abstract | Novel arene-ruthenium [2+2] metalla-rectangles 4 and 5 have been synthesized by self-assembly using dipyridyl amide ligand 3 and arene-ruthenium acceptors (arene: benzoquinone (1), naphthacenedione (2)) and characterized by NMR spectroscopy and ESI-MS. The solid-state structure of 5 was determined by X-ray diffraction and shows encapsulated diethyl ether molecule in the rectangular cavity of 5. The luminescent 5 was further used for anion sensing with the amidic linkage serving as a hydrogen-bond donor site for anions and the ruthenium moiety serving as a signaling unit. A UV/Vis titration study demonstrated that although 5 interacts very weakly with common monoanions as well as with flexible dicarboxylate anions such as malonate and succinate, it displays significant binding affinity (K>103 in MeOH) for rigid multi-carboxylate anions such as oxalate, citrate, and tartrate, exhibiting a 1:1 stoichiometry. It has been suggested that 1:1 bidentate hydrogen bonding assisted by appropriate geometrical complementarity is mainly responsible for the increased affinity of 5 towards such anions. A fluorescence titration study revealed a large fluorescence enhancement of 5 upon binding to multi-carboxylate anions, which can be attributed to the blocking of the photoinduced electron-transfer process from the arene-Ru moiety to the amidic donor in 5 as a result of hydrogen bonding between the donor and the anion. |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Ions; Spectrum analysis; 2011) |