Complexation of acyclic ligands having two terminal quinoline units with alkali metal cations

Autor:	Toshiyuki Kida, Mitsuo Okahara, Yohji Nakatsuji, Kazuhiko Fujiwara, Ryuhei Wakita, Masakatsu Sugimoto, Araki Masuyama
Rok vydání:	1993
Předmět:	Denticity biology Stereochemistry Quinoline chemistry.chemical_element General Chemistry biology.organism_classification Alkali metal Medicinal chemistry Oxygen Crystal chemistry.chemical_compound chemistry Tetra Spectroscopy Derivative (chemistry)
Zdroj:	Supramolecular Chemistry. 2:145-151
ISSN:	1029-0478 1061-0278
DOI:	10.1080/10610279308038309
Popis:	Acyclic multidentate ligands consisting of an oligooxyethylene chain (di-, tri-, tetra-, and penta-) and two terminal rigid quinaldate end groups were newly prepared and their complexation properties with alkali metal cations were estimated by the solvent extraction method to indicate a better affinity for K+. Among them, the tetraethylene glycol derivative showed the highest K+ binding on about the same level as 18-crown-6. Their conformations in solution and in the solid state were examined by using 1H- and 13C-NMR spectroscopy and X-ray crystal analyses, respectively. The better binding of K+ in comparison with the corresponding glymes or analogues having the same donor sites was reasonably explained by considering the effective co-ordination of the carbonyl oxygen of the ester groups and the parallel π-stacking interaction between two quinaldate surfaces.
Databáze:	OpenAIRE
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