Spontaneous hierarchical assembly of crown ether-like macrocycles into nanofibers and microfibers induced by alkali-metal and ammonium salts

Joseph Ka Ho Hui, Peter D. Frischmann, Chien Hsin Tso, Carl A. Michal, Mark J. MacLachlan

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Schiff base macrocycle 1, which has a crown ether like central pore, was combined with different alkali-metal and ammonium salts in chloroform, resulting in one-dimensional supramolecular aggregates. The ion-induced self-assembly was studied with solid-state NMR spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM). It was found that the lengths and widths of the superstructures depend on the cation and counteranion of the salts. Among the salts being used, Na+ and NH4 + ions with BF4 - ions showed the most impressive fibrous structures that can grow up to 1 mm in diameter and hundreds of microns in length. In addition, the size of the fibers can be controlled by the evaporation rate of the solvent. A new macrocycle with bulky triptycenyl substituents that prevent supramolecular assembly was prepared and did not display any nanofibers with alkali-metal ions in chloroform when studied with TEM.

Original languageEnglish
Pages (from-to)2453-2460
Number of pages8
JournalChemistry - A European Journal
Volume16
Issue number8
DOIs
Publication statusPublished - Feb 22 2010
Externally publishedYes

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Alkali Metals
Crown Ethers
Crown ethers
Alkali metals
Nanofibers
Ammonium Compounds
Salts
Ions
Chloroform
Chlorine compounds
Transmission electron microscopy
Schiff Bases
Self assembly
Nuclear magnetic resonance spectroscopy
Metal ions
Cations
Atomic force microscopy
Evaporation
Positive ions
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Spontaneous hierarchical assembly of crown ether-like macrocycles into nanofibers and microfibers induced by alkali-metal and ammonium salts. / Hui, Joseph Ka Ho; Frischmann, Peter D.; Tso, Chien Hsin; Michal, Carl A.; MacLachlan, Mark J.

In: Chemistry - A European Journal, Vol. 16, No. 8, 22.02.2010, p. 2453-2460.

Research output: Contribution to journalArticle

Hui, Joseph Ka Ho ; Frischmann, Peter D. ; Tso, Chien Hsin ; Michal, Carl A. ; MacLachlan, Mark J. / Spontaneous hierarchical assembly of crown ether-like macrocycles into nanofibers and microfibers induced by alkali-metal and ammonium salts. In: Chemistry - A European Journal. 2010 ; Vol. 16, No. 8. pp. 2453-2460.
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