Self-Assembled Arene-Ruthenium-Based Rectangles for the Selective Sensing of Multi-Carboxylate Anions was written by Vajpayee, Vaishali;Song, Young-Ho;Lee, Min-Hyung;Kim, Hyun-Uk;Wang, Ming;Stang, Peter J.;Chi, Ki-Whan. And the article was included in Chemistry – A European Journal in 2011.Related Products of 53118-43-7 The following contents are mentioned in the article:
Novel arene-ruthenium [2+2] metalla-rectangles I and II were synthesized by self-assembly using dipyridyl amide ligand and arene-ruthenium acceptors (arene: benzoquinone, naphthacenedione) and characterized by NMR spectroscopy and ESI-MS. The solid-state structure of II was determined by x-ray diffraction and shows encapsulated di-Et ether mol. in the rectangular cavity of II. The luminescent II 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/visible titration study demonstrated that although II 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. Probably 1:1 bidentate hydrogen bonding assisted by appropriate geometrical complementarity is mainly responsible for the increased affinity of II towards such anions. A fluorescence titration study revealed a large fluorescence enhancement of II 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 II as a result of hydrogen bonding between the donor and the anion. This study involved multiple reactions and reactants, such as N1,N2-Di(pyridin-4-yl)oxalamide (cas: 53118-43-7Related Products of 53118-43-7).
N1,N2-Di(pyridin-4-yl)oxalamide (cas: 53118-43-7) belongs to amides. The solubilities of amides and esters are roughly comparable. Typically amides are less soluble than comparable amines and carboxylic acids since these compounds can both donate and accept hydrogen bonds. Tertiary amides, with the important exception of N,N-dimethylformamide, exhibit low solubility in water. Amides can be freed from solvent or water by drying below their melting points. These purifications can also be used for sulfonamides and acid hydrazides.Related Products of 53118-43-7
Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics