Remarkable reinforcement of a supramolecular gel constructed by heteroditopic [18]crown-6-based molecular recognition

Autor:	Eunyoung, Noh, Sunhong, Park, Sunwoo, Kang, Jin Yong, Lee, Jin Young, Lee, Jong Hwa, Jung
Rok vydání:	2012
Předmět:	chemistry.chemical_classification Ligand Organic Chemistry Inorganic chemistry 18-Crown-6 Supramolecular chemistry General Chemistry Polymer Catalysis Crown Compounds Ion chemistry.chemical_compound Crystallography Molecular recognition chemistry Crown ether
Zdroj:	Chemistry (Weinheim an der Bergstrasse, Germany). 19(8)
ISSN:	1521-3765
Popis:	The heteroditopic crown ether-based ligand 1 containing the diazafluorenylimino group as a binding site for the Zn(2+) and Cs(+) was synthesized. The ligand 1 can be gelated in DMSO/water with and without Cs(+) in the presence of the Zn(2+) ion. Interestingly, the remarkable gelation reinforcement of gel 1 occurred with Cs(+) in the presence of Zn(2+), which is due to the formation of a sandwich complex. According to DFT calculations, one Zn(2+) is bound to two diazafluorenylimino moieties in a tetrahedral structure. In addition, one Cs(+) ion is bound to two crown-rings. The Zn(2+)-diazafluorenylimino ligand gel without Cs(+) shows a spherical structure with 250-800 nm diameter, whereas the Zn(2+)-diazafluorenylimino-based ligand gel with Cs(+) shows a fiber structure with 60-70 nm diameter and several micrometers of lengths. The rheological properties of the Zn(2+)-diazafluorenylimino-based ligand gel were strongly dependent on the presence of Cs(+).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77bf1b986e9eb8ed5978780046ee1498 https://pubmed.ncbi.nlm.nih.gov/23325608 Zobrazit plný text záznamu Plný text