[Interaction between acyclic phenol--formaldehyde oligomers and quaternary ammonium ions].
The interaction between acyclic phenol-formaldehyde oligomers (1) and quaternary ammonium ions (5) was investigated by 1H-NMR spectroscopy. From the induced chemical shift change of 5 in the presence of 1, the cation-pi interaction between the N(+)-(CH3)3 moiety of 5 and the pi-base of 1 occurs during the formation of the complex. Another important observation is that the OH proton signals of 1 are considerably broadened upon addition of 5, indicating that hydrogen bonding occurs between exchangeable protons of 1 and iodide anion of 5. These interactions play an important role in the binding of 5.
Ito
Kazuaki
K
Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa 992-8510, Japan. itokazu@yz.yamagata-u.ac.jp
Miki
Hiromitsu
H
Ohba
Yoshihiro
Y
D000473:Alkanes / Q000737:chemistry; D004347:Drug Interactions; D005557:Formaldehyde / Q000737:chemistry; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D000644:Quaternary Ammonium Compounds / Q000737:chemistry
D000473:Alkanes; D000644:Quaternary Ammonium Compounds; C413608:quaternary bisammonium salt; D005557:Formaldehyde