Hits:

Indexed by:期刊论文

Date of Publication:2016-05-01

Journal:CHEMICAL PAPERS

Included Journals:SCIE、Scopus

Volume:70

Issue:5

Page Number:663-666

ISSN No.:0366-6352

Key Words:cyclophane; reversible reaction; ring-size of macrocycle; supramolecular devices

Abstract:A novel Hg2+ ion induced reversible ring contraction was achieved employing the intramolecular reaction of isobutylene with an aromatic hydroxyl group of cyclophane; reversibility of the reaction was facilitated by excess addition of NaBH4 which also resulted in complexation. The ring contraction and expansion was monitored by UV-VIS absorption, and by fluorescence and H-1 NMR spectra. Switchable fluorescence behavior (on-off-on) was observed when the ring-size was tuned from a 19-membered ring to an 18-membered and vice versa. This fine tuning has the potential to be applied in the construction of new supramolecular devices. (c) 2015 Institute of Chemistry, Slovak Academy of Sciences