97999-83-2Relevant academic research and scientific papers
Pyridinyl Amide Ion Pairs as Lewis Base Organocatalysts
Amp?ler, Torsten,Helberg, Julian,Zipse, Hendrik
, p. 5390 - 5402 (2020)
Pyridinyl amide ion pairs carrying various electron-withdrawing substituents were synthesized with selected ammonium or phosphonium counterions. Compared to neutral pyridine-based organocatalysts, these new ion pair Lewis bases display superior catalytic
Steric and electronic control over the structural diversity of N-(n-pyridinyl) diphenylphosphinic amides (n = 2 and 4) as difunctional ligands in triphenyltin(iv) adducts
Gholivand,Gholami,Tizhoush,Schenk,Fadaei,Bahrami
, p. 44509 - 44516 (2014/12/10)
Two triphenyltin(iv) adducts of difunctional ligands, N-(n-pyridinyl) diphenylphosphinic amide (n = 2 and 4), have been synthesized and characterized by 1H, 31P, 119Sn NMR and IR spectroscopy. The spectroscopic properties of the complexes were compared with those of corresponding ligands. The crystal structures of the complexes were determined by X-ray crystallography, which reveals a trigonal bipyramidal geometry surrounding the tin(iv). Both of the ligands function in an ambidentate mode, ligating through either the O or N atom. The experimental and theoretical (DFT) studies show that the Sn(iv) interacts more strongly with the N-pyridine atom than the PO functional group. Furthermore, DFT calculations, at the B3LYP level, have been carried out to determine the deeper reasons for the adopted bonding mode in the complexes. The influence of the ligand structure on the coordination behaviour and the contribution of hydrogen bonding to the stability of the resulting complexes were elucidated. The results indicate that the intermolecular hydrogen bonds have an important role in the molecular structures and supramolecular associations of the organotin(iv) compounds. This journal is
