Reversible control over molecular recognition in surface-bound photoswitchable hydrogen-bonding receptors: towards read-write-erase molecular printboards.
The synthesis of an anthracene-bearing photoactive barbituric acid receptor and its subsequent grafting onto azide-terminated alkanethiol/Au self-assembled monolayers by using an Cu(I) -catalyzed azide-alkyne reaction is reported. Monolayer characterization using contact-angle measurements, electrochemistry, and spectroscopic ellipsometry indicate that the monolayer conversion is fast and complete. Irradiation of the receptor leads to photodimerization of the anthracenes, which induces the open-to-closed gating of the receptor by blocking access to the binding site. The process is thermally reversible, and polarization-modulated IR reflection-absorption spectroscopy indicates that photochemical closure and thermal opening of the surface-bound receptors occur in 70 and 100 % conversion, respectively. Affinity of the open and closed surface-bound receptor was characterized by using force spectroscopy with a barbituric-acid-modified atomic force microscope tip.
Institut des Sciences Moléculaires CNRS UMR5255, Univ. Bordeaux 1, 351, Cours de la Libération, 33400 Talence (France), Fax: (+33) 5-4000-6158.
Chih-Kai
CK
Liang
Galina V
GV
Dubacheva
Thierry
T
Buffeteau
Dominique
D
Cavagnat
Philippe
P
Hapiot
Bruno
B
Fabre
James H R
JH
Tucker
Dario M
DM
Bassani
anthracene; click chemistry; dimerization; molecular recognition; receptors