Anion-recognition studies of a Re(I)-based square containing the dipyridyl-amide ligand was written by Tzeng, Biing-Chiau;Chen, Yen-Fei;Wu, Chia-Chin;Hu, Cho-Chun;Chang, Ya-Ting;Chen, Chang-Kai. And the article was included in New Journal of Chemistry in 2007.Recommanded Product: N1,N2-Di(pyridin-4-yl)oxalamide The following contents are mentioned in the article:
The mol. square [Re(CO)3Cl(L)]4 (1) containing the dipyridyl-amide ligand, N,N’-4-dipyridyloxalamide (L), was constructed from Re(CO)5Cl and L for the purpose of anion-recognition studies. Upon addition of fluoride anions to a THF solution of 1, a remarkable spectral change is observed, and indeed a new absorption band grows at ∼348 nm. The authors reasoned that upon addition of fluoride, the hydrogen bonds between F– and -NH groups of L would first form and increase the electron densities of nitrogen atoms. This in turn increases the conjugation throughout the L ligand, which is responsible for the new growing absorption band. Finally, a proton-transfer process occurs upon addition of excess F– anions, corroborated by the 1H NMR titration experiment due to the occurrence of HF2–. The binding constants based on a 1:1 complex (1-X–, X– = anions) follow the order: F– > CN– > OAc– > Cl– > Br–, PF6–, BF4–, ClO4–, NO3– and HSO4–. The most electroneg. F– anion shows the largest binding constant, followed by CN–, OAc– and Cl– anions. The less electroneg. Br– anion and bigger PF6–, BF4–, ClO4–, NO3– and HSO4– anions do not show any binding affinity with 1. The control titrations carried out using L and the same series of anions showed that the basicity of anions also possibly lends some contribution to the sensing events. However, the binding affinity of 1 toward various anions can be mostly correlated with the electronegativity as well as cavity size of the mol. square, and hence 1 can be expected to be a sensor for F–. This study involved multiple reactions and reactants, such as N1,N2-Di(pyridin-4-yl)oxalamide (cas: 53118-43-7Recommanded Product: N1,N2-Di(pyridin-4-yl)oxalamide).
N1,N2-Di(pyridin-4-yl)oxalamide (cas: 53118-43-7) belongs to amides. Amides include many other important biological compounds, as well as many drugs like paracetamol, penicillin and LSD. Low-molecular-weight amides, such as dimethylformamide, are common solvents. Ionic, or saltlike, amides are strongly alkaline compounds ordinarily made by treating ammonia, an amine, or a covalent amide with a reactive metal such as sodium.Recommanded Product: N1,N2-Di(pyridin-4-yl)oxalamide
Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics