title: Self-assembled arene-ruthenium-based rectangles for the selective sensing of multi-carboxylate anions.
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>10(3) 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.
authors: Department of Chemistry, University of Ulsan, Ulsan 680-749, Republic of Korea.
authors: Vaishali
authors: V
authors: Vajpayee
authors: Young Ho
authors: YH
authors: Song
authors: Min Hyung
authors: MH
authors: Lee
authors: Hyunuk
authors: H
authors: Kim
authors: Ming
authors: M
authors: Wang
authors: Peter J
authors: PJ
authors: Stang
authors: Ki-Whan
authors: KW
authors: Chi
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