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Issue 18, 2011

Unsurpassed cage effect for the photolysis of dibenzyl ketones in water-soluble dendrimers

Author affiliations

Abstract

Amphiphilic water-soluble poly(alkyl aryl ether) dendrimers Gn (n = 1–3) with charge-neutral tetraethylene glycol monomethyl ethers at their periphery were synthesized as microreactors to control the photochemical reactions of dibenzyl ketone derivatives in aqueous solutions. Photophysical studies demonstrated that Gn can encapsulate organic molecules and provide a hydrophobic microenvironment. The product distribution of photolysis of dibenzyl ketone derivatives can be successfully controlled by encapsulating the substrates within dendrimers, and an unsurpassed cage effect of 1.00 is reached in high generation dendrimers, revealing that a thick and compact “shell” was formed at the periphery of the dendrimers. The cage effect is also significantly influenced by the substituent at the para-position of the guest molecules. The higher generation dendrimers exhibit a better confined microenvironment and the aggregates possess more compact cavities to “lock” the guests than the corresponding unimolecular dendrimers. After photolysis, the separation of products can be easily achieved by extracting from the dendrimer solutions and the dendrimers are simply recovered and reused.

Graphical abstract: Unsurpassed cage effect for the photolysis of dibenzyl ketones in water-soluble dendrimers

Supplementary files

Article information


Submitted
16 Feb 2011
Accepted
06 Jun 2011
First published
06 Jun 2011

Org. Biomol. Chem., 2011,9, 6256-6264
Article type
Paper

Unsurpassed cage effect for the photolysis of dibenzyl ketones in water-soluble dendrimers

Z. Yuan, J. Chen, Y. Zeng, Y. Li, Y. Han and Y. Li, Org. Biomol. Chem., 2011, 9, 6256 DOI: 10.1039/C1OB05244F

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