NDLI: Amphiphilic ferrocenylated alkylpyridinium: the formation of micelles and hydrogels and their disaggregation induced by an external stimulus

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Osakada, Kohtaro Suzaki, Yuji Endo, Hirotaka Kojima, Takahiro
Description	Author Affiliation: Suzaki Y ( Chemical Resources Laboratory R1-3, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan. kosakada@res.titech.ac.jp.)
Abstract	Ferrocene-containing amphiphiles $[py-N-(CH_{2})_{n}OCH_{2}Fc]Cl$ (n = 6 (1a), 8 (1b), 10 (1c); py = $C_{5}H_{5}N,$ Fc = $Fe(C_{5}H_{4})(C_{5}H_{5}))$ were synthesized. The absorption spectra of 1a–1c in the presence of a small amount of dye (Nile red and pyrene) in aqueous media suggested the formation of micelles which encapsulated the dye molecules. Two critical micelle concentrations were observed at 1.1 mM and 2.3 mM at 20 °C. Compounds 1a and 1c showed a single CMC for each, while the formation of two kinds of micelles, the spherical and rod-like ones, depended on the concentrations. The addition of an oxidant, NaOCl, to the aqueous solution of the micelles of 1b turned ferrocene to ferrocenium and caused the disaggregation of the micelles. The addition of α-cyclodextrin (α-CD) to 2b caused the disaggregation of the micelle and the formation of water-soluble [2]- and [3]pseudorotaxane $[\{py-N-(CH_{2})_{8}OCH_{2}Fc\}(α-CD)_{m}]Cl$ $(1b(α-CD)_{m})$ (m = 1, 2), while mixing 1c and α-CD in water formed the rotaxane gel. The addition of NaOCl to the hydrogel of 1c and α-CD changed the gel to sol.
ISSN	14779226
Issue Number	45
Journal	Dalton Trans.
Volume Number	42
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-12-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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