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Synthesis of a Hexagonal Nanosized Macrocyclic Fluorophore with Integrated Endotopic Terpyridine Metal‐Chelation Sites
Author(s) -
Baxter Paul N. W.
Publication year - 2003
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200304786
Subject(s) - terpyridine , chromophore , metal ions in aqueous solution , fluorophore , combinatorial chemistry , materials science , nanotechnology , metal , chelation , yield (engineering) , nanochemistry , chemistry , fluorescence , photochemistry , physics , quantum mechanics , metallurgy
A rigid nanosized hexagonal phenylethynyl cyclophane 5 has been prepared, which incorporates two 2,2′:6′,2″‐terpyridines as integral structural units, for the purpose of binding metal ions. Macrocycle 5 was obtained by a 14‐step synthesis in an overall yield of 11 %, and was characterised by spectroscopic techniques. The efficiency and ease of all transformations, and the relatively enhanced yield of the final macrocyclisation suggests that the entire synthetic pathway should be amenable to scale‐up. Cyclophane 5 possesses four bulky triisopropylsilyl(TIPS)‐protected ethyne substituents which serve a dual role. Firstly, they solubilise the structure thereby facilitating purification and subsequent handling. Secondly, they enable post‐synthetic modification in which additional functionality may be attached to the periphery of the ring. Significantly, 5 was found to be a fluorescent chromophore, and may therefore potentially function as a new sensory platform for the detection of metal ions and H‐bond donating biological substrates. The structurally well‐defined nanosized morphology of 5 , coupled with its interesting spectroscopic properties, supports the expectation that 5 and related architectures will attain a wealth of future applications within the developing fields of nanochemistry and nanoscience.